def testCss3(self):
""" Test for saving data to CSS """
# instantiate kvI with come initial data
initData = """\
/\t\\N
/css_meta\t\\N
/css_meta/version\t{version}
/DBS\t\\N
/DBS/{db}\t\\N
/DBS/{db}/TABLES\t\\N
/DBS/{db}/TABLES/{table}\t\\N
/DBS/{db}/TABLES/{table}/CHUNKS\t\\N
"""
workers = ['worker1', 'worker2']
database = 'TESTDB'
table = 'TABLE'
initData = initData.format(version=css.VERSION,
db=database,
table=table)
css_inst = _makeCss(initData)
mapper = ChunkMapping(workers, database, table, css_inst)
# chunks that are not in CSS should return workers from the list
worker = mapper.worker(1)
self.assertEqual(worker, 'worker1')
worker = mapper.worker(2)
self.assertEqual(worker, 'worker2')
# save stuff to CSS
mapper.save()
# save all CSS to string
data = css_inst.getKvI().dumpKV()
# build another CSS instance from saved data
css_inst = _makeCss(data)
# new mapper, use different worker set to avoid confusion
workers = ['worker1000', 'worker2000']
mapper = ChunkMapping(workers, database, table, css_inst)
# get workers for chunks from css
worker = mapper.worker(1)
self.assertEqual(worker, 'worker1')
worker = mapper.worker(2)
self.assertEqual(worker, 'worker2')
worker = mapper.worker(3)
self.assertEqual(worker, 'worker1000')
worker = mapper.worker(4)
self.assertEqual(worker, 'worker2000')
def testCss3(self):
""" Test for saving data to CSS """
# instantiate kvI with come initial data
initData = """\
/\t\\N
/css_meta\t\\N
/css_meta/version\t{version}
/DBS\t\\N
/DBS/{db}\t\\N
/DBS/{db}/TABLES\t\\N
/DBS/{db}/TABLES/{table}\t\\N
/DBS/{db}/TABLES/{table}/CHUNKS\t\\N
"""
workers = ['worker1', 'worker2']
database = 'TESTDB'
table = 'TABLE'
initData = initData.format(version=css.VERSION, db=database, table=table)
css_inst = _makeCss(initData)
mapper = ChunkMapping(workers, database, table, css_inst)
# chunks that are not in CSS should return workers from the list
worker = mapper.worker(1)
self.assertEqual(worker, 'worker1')
worker = mapper.worker(2)
self.assertEqual(worker, 'worker2')
# save stuff to CSS
mapper.save()
# save all CSS to string
data = css_inst.getKvI().dumpKV()
# build another CSS instance from saved data
css_inst = _makeCss(data)
# new mapper, use different worker set to avoid confusion
workers = ['worker1000', 'worker2000']
mapper = ChunkMapping(workers, database, table, css_inst)
# get workers for chunks from css
worker = mapper.worker(1)
self.assertEqual(worker, 'worker1')
worker = mapper.worker(2)
self.assertEqual(worker, 'worker2')
worker = mapper.worker(3)
self.assertEqual(worker, 'worker1000')
worker = mapper.worker(4)
self.assertEqual(worker, 'worker2000')
class DataLoader(object):
"""
DataLoader class defines all logic for loading data, including data
partitioning, CSS updating, etc. It is driven by a set of configuration
files which are passed to constructor.
"""
def __init__(self, configFiles, czarWmgr, workerWmgrMap={}, chunksDir="./loader_chunks",
chunkPrefix='chunk', keepChunks=False, skipPart=False, oneTable=False,
css=None, cssClear=False, indexDb='qservMeta', tmpDir=None,
emptyChunks=None, deleteTables=False, loggerName=None,
doNotResetEmptyChunks=None, doNotRegisterXrootdDb=None, doNotResetCSSTable=None):
"""
Constructor parses all arguments and prepares for execution.
@param configFiles: Sequence of the files defining all partitioning options.
@param czarWmgr: WmgrClient instance for czar node.
@param workerWmgrMap: Dictionary mapping worker host name to corresponding
WmgrClient instance. May be empty, in which case czar
server will be used for all data.
@param chunksDir: Temporary directory to store chunks files, will be created
if does not exist.
@param chunkPrefix: File name prefix for generated chunk files.
@param keepChunks: Chunks will not be deleted if this argument is set to True.
@param skipPart: If set to True then partitioning will not be performed
(chunks should exist already).
@param oneTable: If set to True then load all data into one table, do not
create chunk tables.
@param css: Instance of CssAccess class, None if CSS operations are disabled.
@param cssClear: If true then CSS info for a table will be deleted first.
@param indexDb: Name of database for object indices, index is generated for director
table when it is partitioned, use empty string to disable index.
@param tmpDir: Temporary directory to store uncompressed files. If None then directory
inside chunksDir will be used. Will be created if does not exist.
@param emptyChunks: Path name for "empty chunks" file, may be None.
@param deleteTables: If True then existing tables in database will be deleted.
@param loggerName: Logger name used for logging all messages from loader.
"""
if not loggerName:
loggerName = __name__
self._log = logging.getLogger(loggerName)
self.configFiles = configFiles
self.czarWmgr = czarWmgr
self.workerWmgrMap = workerWmgrMap.copy()
self.chunksDir = chunksDir
self.tmpDir = tmpDir
self.chunkPrefix = chunkPrefix
self.keepChunks = keepChunks
self.skipPart = skipPart
self.oneTable = oneTable
self.css = css
self.cssClear = cssClear
self.indexDb = None if oneTable else indexDb
self.emptyChunks = emptyChunks
self.doNotResetEmptyChunks = doNotResetEmptyChunks
self.doNotRegisterXrootdDb = doNotRegisterXrootdDb
self.doNotResetCSSTable = doNotResetCSSTable
self.deleteTables = deleteTables
self.chunkRe = re.compile('^' + self.chunkPrefix + '_(?P<id>[0-9]+)(?P<ov>_overlap)?[.]txt$')
self.cleanupDirs = []
self.cleanupFiles = []
self.unzipDir = None # directory used for uncompressed data
self.schema = None # "CREATE TABLE" statement
self.chunks = set() # set of chunks that were loaded
self.chunkMap = None
self.createdChunks = set()
# parse all config files, this can raise an exception
self.partOptions = PartConfig(configFiles)
# Logic is slightly complicated here, so pre-calculate options that we need below:
# 1. If self.skipPart and self.oneTable are both true then we skip partitioning
# even for partitioned tables and load original data. So if self.skipPart and
# self.oneTable are both true then we say table is not partitioned
# 2. Partitioning is done only for partitioned table, if self.skipPart is true then
# pre-partitioned data must exist already and we skip calling partitioner
# is table partitioned (or pre-partitioned)?
self.partitioned = self.partOptions.partitioned
# do we need to run partitioner?
self.callPartitioner = self.partitioned and not self.skipPart
def load(self, database, table, schema, data):
"""
Do actual loading based on parameters defined in constructor.
This will throw exception if anything goes wrong.
@param database: Database name.
@param table: Table name.
@param schema: File name which contains SQL with CREATE TABLE/VIEW.
@param data: List of file names with data, may be empty (e.g. when
defining views instead of tables).
"""
if not _mysql_identifier_validator(table):
raise ValueError('MySQL table name not allowed: ' + table)
if not _mysql_identifier_validator(database):
raise ValueError('MySQL database name not allowed: ' + database)
try:
return self._run(database, table, schema, data)
finally:
self._cleanup()
def _run(self, database, table, schema, data):
"""
Do loading only, cleanup is done in _cleanup()
"""
# see if database is already defined in CSS and get its partitioning info
if self.css is not None:
self._checkCss(database, table)
# make chunk mapper
self.chunkMap = ChunkMapping(list(self.workerWmgrMap.keys()), database, table, self.css)
# make chunks directory or check that there are usable data there already
self._makeOrCheckChunksDir(data)
# uncompress data files that are compressed, this is only needed if
# table is not partitioned or if we are not reusing existing chunks
files = data
if not (self.partitioned and self.skipPart and not self.oneTable):
files = self._gunzip(data)
# run partitioner if necessary
if files and self.callPartitioner:
self._runPartitioner(files)
# drop existing tables
if self.deleteTables:
self._deleteTable(database, table)
# create table
self._createTable(database, table, schema)
# load data
self._loadData(database, table, files)
# create special dummy chunk
self._log.info("*** SES *** createDummyChunk")
self._createDummyChunk(database, table)
# create index on czar size
self._log.info("*** SES *** makeindex")
self._makeIndex(database, table)
# update CSS with info for this table
if self.css is not None:
self._updateCss(database, table)
# optionally make emptyChunks file
# self._makeEmptyChunks()
if not self.doNotResetEmptyChunks:
self._log.info('*** SES *** : create empty chunk file')
self._makeEmptyChunks()
else:
self._log.info('*** SES *** : keep existing empty chunk file')
self._updateEmptyChunks()
def _cleanup(self):
"""
Do cleanup, remove all temporary files, this should not throw.
"""
# remove tmp files
for fName in self.cleanupFiles:
try:
self._log.debug('Deleting temporary file: %r', fName)
os.unlink(fName)
except Exception as exc:
self._log.error('Failed to remove temporary file: %r', exc)
# remove directories
for dirName in self.cleanupDirs:
try:
self._log.debug('Deleting directory: %r', dirName)
shutil.rmtree(dirName)
except Exception as exc:
self._log.error('Failed to remove directory: %r', exc)
def _checkCss(self, database, table):
"""
Check CSS for existing configuration and see if it matches ours.
Throws exception if any irregularities are observed.
"""
self._log.info('Verifying CSS info for table %r', table)
# get striping info
try:
striping = self.css.getDbStriping(database)
self._log.debug('CSS database striping info: %r', striping)
except css.NoSuchDb:
# we'll create it later
return
# check parameters
self._checkPartParam(self.partOptions, 'part.num-stripes', striping.stripes, int)
self._checkPartParam(self.partOptions, 'part.num-sub-stripes', striping.subStripes, int)
self._checkPartParam(self.partOptions, 'part.default-overlap', striping.overlap, float)
# also check that table does not exist in CSS, or optionally remove it
cssTableExists = self.css.containsTable(database, table)
if cssTableExists:
if self.cssClear:
# try to remove it
self.css.dropTable(database, table)
else:
self._log.error('Table is already defined in CSS')
if not self.doNotResetCSSTable:
raise RuntimeError('table exists in CSS')
@staticmethod
def _checkPartParam(partOptions, partKey, cssValue, optType=str):
"""
Check that partitioning parameters are compatible. Throws exception
if there is a mismatch.
"""
optValue = optType(partOptions[partKey])
if optValue != cssValue:
raise ValueError('Option %r does not match CSS: %r != %r' %
(partKey, optValue, cssValue))
def _makeOrCheckChunksDir(self, data):
'''Create directory for chunk data or check that it exists, throws in case of errors.'''
# only need it for partitioned table
if not self.partitioned:
return
# in case we do skip-part but load into one table then we just take
# data from command line if it is specified
if self.oneTable and self.skipPart and data:
return
chunks_dir = self.chunksDir
# if it exists it must be directory
exists = False
if os.path.exists(chunks_dir):
exists = True
if not os.path.isdir(chunks_dir):
self._log.error('Path for chunks exists but is not a directory: %r', chunks_dir)
raise IOError('chunk path is not directory: ' + chunks_dir)
if self.skipPart:
# directory must exist and have some files (chunk_index.bin at least)
if not exists:
self._log.error('Chunks directory does not exist: %r', chunks_dir)
raise RuntimeError('chunk directory is missing')
path = os.path.join(chunks_dir, 'chunk_index.bin')
if not os.path.exists(path):
self._log.error('Could not find required file (chunk_index.bin) in chunks directory')
raise RuntimeError('chunk_index.bin is missing')
else:
if exists:
# must be empty, we do not want any extraneous stuff there
if os.listdir(chunks_dir):
self._log.error('Chunks directory is not empty: %r', chunks_dir)
raise RuntimeError('chunks directory is not empty: ' + chunks_dir)
else:
try:
self._log.debug('Creating chunks directory %r', chunks_dir)
os.makedirs(chunks_dir)
# will remove it later
if not self.keepChunks:
self.cleanupDirs.append(chunks_dir)
except Exception as exc:
self._log.error('Failed to create chunks directory: %r', exc)
raise
def _runPartitioner(self, files):
'''Run partitioner to fill chunks directory with data, returns 0 on success.'''
def fileList(dirName):
'''Generate a sequence of file names in directory, exclude directories'''
for fName in os.listdir(dirName):
path = os.path.join(dirName, fName)
if os.path.isfile(path):
yield path
# build arguments list
partitioner = 'sph-partition-matches' if self.partOptions.isRefMatch else 'sph-partition'
args = [partitioner, '--out.dir', self.chunksDir, '--part.prefix', self.chunkPrefix]
for config in self.configFiles:
args += ['--config-file', config]
for data in files:
args += ['--in', data]
try:
# run partitioner
self._log.info('run partitioner on files: %r', ' '.join(files))
self._log.debug('Run shell command: %r', ' '.join(args))
subprocess.check_output(args=args)
except Exception as exc:
self._log.error('Failed to run partitioner: %r', exc)
raise
finally:
# some chunk files may have been created, add them to cleanup list
if not self.keepChunks:
self.cleanupFiles += list(fileList(self.chunksDir))
def _gunzip(self, data):
"""
Uncompress compressed input files to a temporary directory.
Returns list of input file names with compressed files replaced by
uncompressed file location. Throws exception in case of errors.
"""
result = []
for infile in data:
# we rely on file extension to decide whether it is compressed or not,
# for more reliable way we could use something like "magic" module
if infile.endswith('.gz'):
if self.tmpDir is None:
# use chunks directory for that
if os.path.exists(self.chunksDir):
if not os.path.isdir(self.chunksDir):
self._log.error('Path for chunks is not a directory: %r', self.chunksDir)
raise IOError('chunk path is not directory: ' + self.chunksDir)
else:
# create it, but don't forget to delete it later
self._log.debug('Creating chunks directory %r', self.chunksDir)
os.makedirs(self.chunksDir)
if not self.keepChunks:
self.cleanupDirs.append(self.chunksDir)
try:
self.tmpDir = tempfile.mkdtemp(dir=self.chunksDir)
# need to remove it later, before chunks dir
self.cleanupDirs.insert(0, self.tmpDir)
except Exception as exc:
self._log.critical('Failed to create temp directory for uncompressed files: %r', exc)
raise
self._log.debug('Created temporary directory %r', self.tmpDir)
else:
# check and create if needed
if os.path.exists(self.tmpDir):
if not os.path.isdir(self.tmpDir):
self._log.critical('Temporary location is not a directory: %r', self.tmpDir)
raise IOError('Temporary location is not a directory: ' + self.tmpDir)
else:
try:
os.mkdir(self.tmpDir)
self._log.debug('Created temporary directory %r', self.tmpDir)
# need to remove it later
self.cleanupDirs.append(self.tmpDir)
except Exception as exc:
self._log.critical('Failed to create temp directory: %r', exc)
raise
# construct output file name
outfile = os.path.basename(infile)
outfile = os.path.splitext(outfile)[0]
outfile = os.path.join(self.tmpDir, outfile)
# will cleanup it later
self.cleanupFiles.append(outfile)
self._log.info('Uncompressing %r to %r', infile, outfile)
try:
finput = open(infile)
foutput = open(outfile, 'wb')
cmd = ['gzip', '-d', '-c']
subprocess.check_call(args=cmd, stdin=finput, stdout=foutput)
except Exception as exc:
self._log.critical('Failed to uncompress data file: %r', exc)
raise
else:
# file is already uncompressed
self._log.debug('Using input file which is not compressed: %r', infile)
outfile = infile
result.append(outfile)
return result
def _connections(self, useCzar, useWorkers):
"""
Returns a list of wmgr "connections", for each conection there is a
tuple (name, connection) where name is something like "czar" or
"worker lsst-dbdev2". If czar connection is included then it
is always first in the list.
@param useCzar: if True then include czar in the list
@param useWorkers: if True then include all workers in the list
"""
res = []
if useCzar:
res += [("czar", self.czarWmgr)]
if useWorkers:
for worker, wmgr in self.workerWmgrMap.items():
res += [('worker ' + worker, wmgr)]
return res
def _deleteTable(self, database, table):
"""
Drop existing table and all chunks.
"""
self._log.info('Deleting existing table %r (and chunks)', table)
for name, wmgr in self._connections(useCzar=True, useWorkers=True):
self._log.info('Deleting table from %r', name)
wmgr.dropTable(database, table, dropChunks=True, mustExist=False)
def _createTable(self, database, table, schema):
"""
Create table in the database. Just executes whatever SQL was given to
us in a schema file. Additionally applies fixes to a schema after loading.
"""
# read table schema
try:
self.schema = open(schema).read()
except Exception as exc:
self._log.critical('Failed to read table schema file: %r', exc)
raise
# create table on czar and every worker
for name, wmgr in self._connections(useCzar=True, useWorkers=True):
self._log.info('Creating table %r in %r', table, name)
chunkColumns = bool(self.partitioned)
try:
wmgr.createTable(database, table, schema=self.schema, chunkColumns=chunkColumns)
except ServerError as exc:
if exc.code == 409:
self._log.info('Table %r exists in %r', table, name)
else:
self._log.critical('Failed to create table %r in %r', table, name)
raise
def _loadData(self, database, table, files):
"""
Load data into existing table.
"""
if not self.partitioned or (self.oneTable and self.skipPart and files):
# load files given on command line
self._loadNonChunkedData(database, table, files)
else:
# load data from chunk directory
self._loadChunkedData(database, table)
def _chunkFiles(self):
"""
Generator method which returns list of all chunk files. For each chunk returns
a triplet (path:string, chunkId:int, overlap:bool).
"""
for dirpath, _, filenames in os.walk(self.chunksDir, followlinks=True):
for fileName in filenames:
match = self.chunkRe.match(fileName)
if match is not None:
path = os.path.join(dirpath, fileName)
chunkId = int(match.group('id'))
overlap = match.group('ov') is not None
yield (path, chunkId, overlap)
def _loadChunkedData(self, database, table):
"""
Load chunked data into mysql table, if one-table option is specified then all chunks
are loaded into a single table with original name, otherwise we create one table per chunk.
"""
# As we read from partitioner output files we use "out.csv" option for that.
csvPrefix = "out.csv"
for path, chunkId, overlap in self._chunkFiles():
# remember all chunks that we loaded
if not overlap:
self.chunks.add(chunkId)
if self.oneTable:
# just load everything into existing table, do not load overlaps
if not overlap:
self._loadOneFile(self.czarWmgr, database, table, path, csvPrefix)
else:
self._log.info('Ignore overlap file %r', path)
else:
# Partitioner may potentially produce empty overlap files even
# in cases when we should not make overlap tables. Check and
# filter out empty files or complain about non-empty.
if overlap and not self.partOptions.isSubChunked:
# check contents, try to read some data and strip spaces
data = open(path).read(1024).strip()
if data:
raise RuntimeError('Found non-empty overlap file for non-subchunked table: ' + path)
else:
self._log.info('Ignore empty overlap file %r', path)
continue
if self.workerWmgrMap:
# find database for this chunk
worker = self.chunkMap.worker(chunkId)
wmgr = self.workerWmgrMap.get(worker)
if wmgr is None:
raise RuntimeError('Existing chunk mapping is not in the list of workers: ' + worker)
self._log.info('load chunk %r to worker %r', chunkId, worker)
else:
# all goes to single node
self._log.info('load chunk %r to czar', chunkId)
wmgr = self.czarWmgr
# make tables if needed
if chunkId not in self.createdChunks:
try:
wmgr.createChunk(database, table, chunkId, overlap=self.partOptions.isSubChunked)
self.createdChunks.add(chunkId)
except ServerError as exc:
if exc.code == 409:
self._log.info('Chunk %r exists for table %r', chunkId, table)
else:
self._log.critical('Failed to create chunk %r for table %r', chunkId, table)
raise
# load data into chunk table
self._loadOneFile(wmgr, database, table, path, csvPrefix, chunkId=chunkId, overlap=overlap)
@staticmethod
def _chunkTableName(table, chunkId, overlap):
"""
Return full chunk table name or overlap table name.
"""
ctable = table
if overlap:
ctable += 'FullOverlap'
ctable += '_'
ctable += str(chunkId)
return ctable
def _createDummyChunk(self, database, table):
"""
Make special dummy chunk in case of partitioned data.
"""
if not self.partitioned or self.oneTable:
# only do it for true partitioned stuff
return
# this is only needed on worker (or czar if there are no workers)
connections = self._connections(useCzar=False, useWorkers=True)
if not connections:
connections = self._connections(useCzar=True, useWorkers=False)
for name, wmgr in connections:
self._log.info('Make dummy chunk table for %r', table)
# just make regular chunk with special ID, do not load any data
try:
wmgr.createChunk(database, table, 1234567890, overlap=self.partOptions.isSubChunked)
except ServerError as exc:
if exc.code == 409:
self._log.info('Dummy chunk 1234567890 exists for table %r', table)
else:
self._log.critical('Failed to create dummy chunk 1234567890 for table %r', table)
raise
def _loadNonChunkedData(self, database, table, files):
"""
Load non-chunked data into mysql table. We use (unzipped) files that
we got for input.
"""
# As we read from input files (which are also input files for partitioner)
# we use "in.csv" option for that.
csvPrefix = "in.csv"
# this is only needed on workers (or czar if there are no workers)
connections = self._connections(useCzar=False, useWorkers=True)
if not connections:
connections = self._connections(useCzar=True, useWorkers=False)
for name, wmgr in connections:
self._log.info('load non-chunked data to %r', name)
for file in files:
self._loadOneFile(wmgr, database, table, file, csvPrefix)
def _loadOneFile(self, wmgr, database, table, path, csvPrefix, chunkId=None, overlap=None):
"""Load data from a single file into existing table"""
self._log.info('load table %r.%r from file %r', database, table, path)
# need to know special characters used in csv
# default delimiter is the same as in partitioner
special_chars = {'delimiter': '\t',
'enclose': '',
'escape': '\\',
'newline': '\n'}
data = {}
for name, default in special_chars.items():
data[name] = self.partOptions.get(csvPrefix + '.' + name, default)
try:
file = open(path, "rb")
except IOError as exc:
self._log.error('failed to open file %r', path)
raise
wmgr.loadData(database, table, file, fileName=path, chunkId=chunkId, overlap=overlap,
delimiter=data['delimiter'], enclose=data['enclose'],
escape=data['escape'], terminate=data['newline'])
def _updateCss(self, database, table):
"""
Update CSS with information about loaded table and database.
"""
# create database in CSS if not there yet
if not self.css.containsDb(database):
self._log.info('Creating database CSS info')
options = self.partOptions.cssDbOptions()
striping = css.StripingParams(options['nStripes'], options['nSubStripes'],
0, options['overlap'])
self.css.createDb(database, striping, options['storageClass'], 'RELEASED')
# define options for table
options = self.partOptions.cssTableOptions()
schema = self._schemaForCSS(database, table)
if options.get('match', False):
matchParams = css.MatchTableParams(options['dirTable1'], options['dirColName1'],
options['dirTable2'], options['dirColName2'],
options['flagColName'])
self._log.info('Creating table CSS info for match table')
self.css.createMatchTable(database, table, schema, matchParams)
else:
if 'dirTable' in options:
# partitioned table
pParams = css.PartTableParams(options['dirDb'], options['dirTable'], options['dirColName'],
options['latColName'], options['lonColName'],
options['overlap'], True, options['subChunks'])
sParams = css.ScanTableParams(options['lockInMem'], options['scanRating'])
else:
pParams = css.PartTableParams()
sParams = css.ScanTableParams()
if not self.doNotResetCSSTable:
self.css.createTable(database, table, schema, pParams, sParams)
# save chunk mapping too
self._log.info('Saving updated chunk map to CSS')
self.chunkMap.save()
def _schemaForCSS(self, database, table):
"""
Returns schema string for CSS, which is a create table only without
create table, only column definitions
"""
schema = self.czarWmgr.tableSchema(database, table)
# strip CREATE TABLE
i = schema.find('(')
return schema[i:]
def _makeEmptyChunks(self):
"""
Generate empty chunks file, should be called after loading is complete.
"""
if not self.emptyChunks:
# need a file name
return
# only makes sense for true partitioned tables
if not self.partitioned:
self._log.info('Table is not partitioned, will not make empty chunks file %r', self.emptyChunks)
return
# max possible number of chunks
nStripes = int(self.partOptions['part.num-stripes'])
maxChunks = 2 * nStripes ** 2
self._log.info('Making empty chunk list (max.chunk=%d) %r', maxChunks, self.emptyChunks)
emptyChunkDir = os.path.dirname(self.emptyChunks)
try:
os.makedirs(emptyChunkDir)
except OSError:
if not os.path.isdir(emptyChunkDir):
raise
out = open(self.emptyChunks, 'w')
for chunk in range(maxChunks):
if chunk not in self.chunks:
print(chunk, file=out)
def _updateEmptyChunks(self):
if not self.emptyChunks:
# need a file name
return
# only makes sense for true partitioned tables
if not self.partitioned:
self._log.info('Table is not partitioned, will not make empty chunks file %r', self.emptyChunks)
return
# max possible number of chunks
nStripes = int(self.partOptions['part.num-stripes'])
maxChunks = 2 * nStripes ** 2
existingChunkList=[i for i in range(0,maxChunks)]
# try:
# in_file = open(self.emptyChunks, 'r')
# tmp = in_file.readlines()
# in_file.close()
# existingChunkList=[int(x.strip()) for x in tmp if x.strip()!=""]
# self._log.info("Existing chunks : ",existingChunkList)
# except:
# pass
in_file = open(self.emptyChunks, 'r')
tmp = in_file.readlines()
in_file.close()
existingChunkList=[int(x.strip()) for x in tmp if x.strip()!=""]
# self._log.info("Existing chunks : ",existingChunkList)
out = open(self.emptyChunks, 'w')
for chunk in range(maxChunks):
if chunk not in self.chunks and chunk in existingChunkList:
print(chunk, file=out)
def _makeIndex(self, database, table):
"""
Generate object index in czar meta database.
"""
# only makes sense for director table
if not self.partitioned or \
not self.partOptions.isDirector(database, table) or \
not self.indexDb:
self._log.info("*** SES *** : non index")
return
metaTable = database + '__' + table
self._log.info('Generating index %r.%r', self.indexDb, metaTable)
# try to delete existing table first
# self.czarWmgr.dropTable(self.indexDb, metaTable, mustExist=False)
# index column
idxCol = self.partOptions['id']
# get index column type from original table
idxColType = 'BIGINT'
for col in self.czarWmgr.tableColumns(database, table):
if col['name'] == idxCol:
idxColType = col['type']
break
# make a table, InnoDB engine is required for scalability
schema = "CREATE TABLE IF NOT EXISTS {table} ({column} {type} NOT NULL PRIMARY KEY, chunkId INT, subChunkId INT)"
schema += " ENGINE = INNODB"
schema = schema.format(table=metaTable, column=idxCol, type=idxColType)
self.czarWmgr.createTable(self.indexDb, metaTable, schema=schema)
# call one of the two methods
if self.workerWmgrMap:
self._makeIndexMultiNode(database, table, metaTable, idxCol)
else:
self._makeIndexSingleNode(database, table, metaTable, idxCol)
def _makeIndexMultiNode(self, database, table, metaTable, idxCol):
"""
Generate object index in czar meta database in case chunks are on a separate
server from index database. It needs to copy all index data over network,
may need special optimization or parameters.
"""
# load data from all chunks
for chunk in self.chunks:
# get worker name for this chunk
wname = self.chunkMap.worker(chunk)
wmgr = self.workerWmgrMap[wname]
self._loadChunkIndex(wmgr, database, table, chunk, metaTable, idxCol)
def _makeIndexSingleNode(self, database, table, metaTable, idxCol):
"""
Generate object index in czar meta database in case all chunks are also on czar.
"""
# TODO: there is for sure more efficient method than copying data locally
# load data from all chunks
for chunk in self.chunks:
self._loadChunkIndex(self.czarWmgr, database, table, chunk, metaTable, idxCol)
def _loadChunkIndex(self, wmgr, database, table, chunk, metaTable, idxCol):
"""
Load secondary index with data from a single chunk.
"""
# get index data from worker (or czar)
columns = (idxCol, 'chunkId', 'subChunkId')
indexData = wmgr.getIndex(database, table, chunkId=chunk, columns=columns)
# dump it into a in-memory file, loadData expects binary mode
data = BytesIO()
for row in indexData:
data.write(b"%d\t%d\t%d\n" % tuple(row))
data.seek(0)
# send that file to czar
self.czarWmgr.loadData(self.indexDb, metaTable, data)
class DataLoader(object):
"""
DataLoader class defines all logic for loading data, including data
partitioning, CSS updating, etc. It is driven by a set of configuration
files which are passed to constructor.
"""
def __init__(self,
configFiles,
czarWmgr,
workerWmgrMap={},
chunksDir="./loader_chunks",
chunkPrefix='chunk',
keepChunks=False,
skipPart=False,
oneTable=False,
css=None,
cssClear=False,
indexDb='qservMeta',
tmpDir=None,
emptyChunks=None,
deleteTables=False,
loggerName=None):
"""
Constructor parses all arguments and prepares for execution.
@param configFiles: Sequence of the files defining all partitioning options.
@param czarWmgr: WmgrClient instance for czar node.
@param workerWmgrMap: Dictionary mapping worker host name to corresponding
WmgrClient instance. May be empty, in which case czar
server will be used for all data.
@param chunksDir: Temporary directory to store chunks files, will be created
if does not exist.
@param chunkPrefix: File name prefix for generated chunk files.
@param keepChunks: Chunks will not be deleted if this argument is set to True.
@param skipPart: If set to True then partitioning will not be performed
(chunks should exist already).
@param oneTable: If set to True then load all data into one table, do not
create chunk tables.
@param css: Instance of CssAccess class, None if CSS operations are disabled.
@param cssClear: If true then CSS info for a table will be deleted first.
@param indexDb: Name of database for object indices, index is generated for director
table when it is partitioned, use empty string to disable index.
@param tmpDir: Temporary directory to store uncompressed files. If None then directory
inside chunksDir will be used. Will be created if does not exist.
@param emptyChunks: Path name for "empty chunks" file, may be None.
@param deleteTables: If True then existing tables in database will be deleted.
@param loggerName: Logger name used for logging all messages from loader.
"""
if not loggerName:
loggerName = __name__
self._log = logging.getLogger(loggerName)
self.configFiles = configFiles
self.czarWmgr = czarWmgr
self.workerWmgrMap = workerWmgrMap.copy()
self.chunksDir = chunksDir
self.tmpDir = tmpDir
self.chunkPrefix = chunkPrefix
self.keepChunks = keepChunks
self.skipPart = skipPart
self.oneTable = oneTable
self.css = css
self.cssClear = cssClear
self.indexDb = None if oneTable else indexDb
self.emptyChunks = emptyChunks
self.deleteTables = deleteTables
self.chunkRe = re.compile('^' + self.chunkPrefix +
'_(?P<id>[0-9]+)(?P<ov>_overlap)?[.]txt$')
self.cleanupDirs = []
self.cleanupFiles = []
self.unzipDir = None # directory used for uncompressed data
self.schema = None # "CREATE TABLE" statement
self.chunks = set() # set of chunks that were loaded
self.chunkMap = None
self.createdChunks = set()
# parse all config files, this can raise an exception
self.partOptions = PartConfig(configFiles)
# Logic is slightly complicated here, so pre-calculate options that we need below:
# 1. If self.skipPart and self.oneTable are both true then we skip partitioning
# even for partitioned tables and load original data. So if self.skipPart and
# self.oneTable are both true then we say table is not partitioned
# 2. Partitioning is done only for partitioned table, if self.skipPart is true then
# pre-partitioned data must exist already and we skip calling partitioner
# is table partitioned (or pre-partitioned)?
self.partitioned = self.partOptions.partitioned
# do we need to run partitioner?
self.callPartitioner = self.partitioned and not self.skipPart
def load(self, database, table, schema, data):
"""
Do actual loading based on parameters defined in constructor.
This will throw exception if anything goes wrong.
@param database: Database name.
@param table: Table name.
@param schema: File name which contains SQL with CREATE TABLE/VIEW.
@param data: List of file names with data, may be empty (e.g. when
defining views instead of tables).
"""
if not _mysql_identifier_validator(table):
raise ValueError('MySQL table name not allowed: ' + table)
if not _mysql_identifier_validator(database):
raise ValueError('MySQL database name not allowed: ' + database)
try:
return self._run(database, table, schema, data)
finally:
self._cleanup()
def _run(self, database, table, schema, data):
"""
Do loading only, cleanup is done in _cleanup()
"""
# see if database is already defined in CSS and get its partitioning info
if self.css is not None:
self._checkCss(database, table)
# make chunk mapper
self.chunkMap = ChunkMapping(list(self.workerWmgrMap.keys()), database,
table, self.css)
# make chunks directory or check that there are usable data there already
self._makeOrCheckChunksDir(data)
# uncompress data files that are compressed, this is only needed if
# table is not partitioned or if we are not reusing existing chunks
files = data
if not (self.partitioned and self.skipPart and not self.oneTable):
files = self._gunzip(data)
# run partitioner if necessary
if files and self.callPartitioner:
self._runPartitioner(files)
# drop existing tables
if self.deleteTables:
self._deleteTable(database, table)
# create table
self._createTable(database, table, schema)
# load data
self._loadData(database, table, files)
# create special dummy chunk
self._createDummyChunk(database, table)
# create index on czar size
self._makeIndex(database, table)
# update CSS with info for this table
if self.css is not None:
self._updateCss(database, table)
# optionally make emptyChunks file
self._makeEmptyChunks()
def _cleanup(self):
"""
Do cleanup, remove all temporary files, this should not throw.
"""
# remove tmp files
for fName in self.cleanupFiles:
try:
self._log.debug('Deleting temporary file: %r', fName)
os.unlink(fName)
except Exception as exc:
self._log.error('Failed to remove temporary file: %r', exc)
# remove directories
for dirName in self.cleanupDirs:
try:
self._log.debug('Deleting directory: %r', dirName)
shutil.rmtree(dirName)
except Exception as exc:
self._log.error('Failed to remove directory: %r', exc)
def _checkCss(self, database, table):
"""
Check CSS for existing configuration and see if it matches ours.
Throws exception if any irregularities are observed.
"""
self._log.info('Verifying CSS info for table %r', table)
# get striping info
try:
striping = self.css.getDbStriping(database)
self._log.debug('CSS database striping info: %r', striping)
except css.NoSuchDb:
# we'll create it later
return
# check parameters
self._checkPartParam(self.partOptions, 'part.num-stripes',
striping.stripes, int)
self._checkPartParam(self.partOptions, 'part.num-sub-stripes',
striping.subStripes, int)
self._checkPartParam(self.partOptions, 'part.default-overlap',
striping.overlap, float)
# also check that table does not exist in CSS, or optionally remove it
cssTableExists = self.css.containsTable(database, table)
if cssTableExists:
if self.cssClear:
# try to remove it
self.css.dropTable(database, table)
else:
self._log.error('Table is already defined in CSS')
raise RuntimeError('table exists in CSS')
@staticmethod
def _checkPartParam(partOptions, partKey, cssValue, optType=str):
"""
Check that partitioning parameters are compatible. Throws exception
if there is a mismatch.
"""
optValue = optType(partOptions[partKey])
if optValue != cssValue:
raise ValueError('Option %r does not match CSS: %r != %r' %
(partKey, optValue, cssValue))
def _makeOrCheckChunksDir(self, data):
'''Create directory for chunk data or check that it exists, throws in case of errors.'''
# only need it for partitioned table
if not self.partitioned:
return
# in case we do skip-part but load into one table then we just take
# data from command line if it is specified
if self.oneTable and self.skipPart and data:
return
chunks_dir = self.chunksDir
# if it exists it must be directory
exists = False
if os.path.exists(chunks_dir):
exists = True
if not os.path.isdir(chunks_dir):
self._log.error(
'Path for chunks exists but is not a directory: %r',
chunks_dir)
raise IOError('chunk path is not directory: ' + chunks_dir)
if self.skipPart:
# directory must exist and have some files (chunk_index.bin at least)
if not exists:
self._log.error('Chunks directory does not exist: %r',
chunks_dir)
raise RuntimeError('chunk directory is missing')
path = os.path.join(chunks_dir, 'chunk_index.bin')
if not os.path.exists(path):
self._log.error(
'Could not find required file (chunk_index.bin) in chunks directory'
)
raise RuntimeError('chunk_index.bin is missing')
else:
if exists:
# must be empty, we do not want any extraneous stuff there
if os.listdir(chunks_dir):
self._log.error('Chunks directory is not empty: %r',
chunks_dir)
raise RuntimeError('chunks directory is not empty: ' +
chunks_dir)
else:
try:
self._log.debug('Creating chunks directory %r', chunks_dir)
os.makedirs(chunks_dir)
# will remove it later
if not self.keepChunks:
self.cleanupDirs.append(chunks_dir)
except Exception as exc:
self._log.error('Failed to create chunks directory: %r',
exc)
raise
def _runPartitioner(self, files):
'''Run partitioner to fill chunks directory with data, returns 0 on success.'''
def fileList(dirName):
'''Generate a sequence of file names in directory, exclude directories'''
for fName in os.listdir(dirName):
path = os.path.join(dirName, fName)
if os.path.isfile(path):
yield path
# build arguments list
partitioner = 'sph-partition-matches' if self.partOptions.isRefMatch else 'sph-partition'
args = [
partitioner, '--out.dir', self.chunksDir, '--part.prefix',
self.chunkPrefix
]
for config in self.configFiles:
args += ['--config-file', config]
for data in files:
args += ['--in', data]
try:
# run partitioner
self._log.info('run partitioner on files: %r', ' '.join(files))
self._log.debug('Run shell command: %r', ' '.join(args))
subprocess.check_output(args=args)
except Exception as exc:
self._log.error('Failed to run partitioner: %r', exc)
raise
finally:
# some chunk files may have been created, add them to cleanup list
if not self.keepChunks:
self.cleanupFiles += list(fileList(self.chunksDir))
def _gunzip(self, data):
"""
Uncompress compressed input files to a temporary directory.
Returns list of input file names with compressed files replaced by
uncompressed file location. Throws exception in case of errors.
"""
result = []
for infile in data:
# we rely on file extension to decide whether it is compressed or not,
# for more reliable way we could use something like "magic" module
if infile.endswith('.gz'):
if self.tmpDir is None:
# use chunks directory for that
if os.path.exists(self.chunksDir):
if not os.path.isdir(self.chunksDir):
self._log.error(
'Path for chunks is not a directory: %r',
self.chunksDir)
raise IOError('chunk path is not directory: ' +
self.chunksDir)
else:
# create it, but don't forget to delete it later
self._log.debug('Creating chunks directory %r',
self.chunksDir)
os.makedirs(self.chunksDir)
if not self.keepChunks:
self.cleanupDirs.append(self.chunksDir)
try:
self.tmpDir = tempfile.mkdtemp(dir=self.chunksDir)
# need to remove it later, before chunks dir
self.cleanupDirs.insert(0, self.tmpDir)
except Exception as exc:
self._log.critical(
'Failed to create temp directory for uncompressed files: %r',
exc)
raise
self._log.debug('Created temporary directory %r',
self.tmpDir)
else:
# check and create if needed
if os.path.exists(self.tmpDir):
if not os.path.isdir(self.tmpDir):
self._log.critical(
'Temporary location is not a directory: %r',
self.tmpDir)
raise IOError(
'Temporary location is not a directory: ' +
self.tmpDir)
else:
try:
os.mkdir(self.tmpDir)
self._log.debug('Created temporary directory %r',
self.tmpDir)
# need to remove it later
self.cleanupDirs.append(self.tmpDir)
except Exception as exc:
self._log.critical(
'Failed to create temp directory: %r', exc)
raise
# construct output file name
outfile = os.path.basename(infile)
outfile = os.path.splitext(outfile)[0]
outfile = os.path.join(self.tmpDir, outfile)
# will cleanup it later
self.cleanupFiles.append(outfile)
self._log.info('Uncompressing %r to %r', infile, outfile)
try:
finput = open(infile)
foutput = open(outfile, 'wb')
cmd = ['gzip', '-d', '-c']
subprocess.check_call(args=cmd,
stdin=finput,
stdout=foutput)
except Exception as exc:
self._log.critical('Failed to uncompress data file: %r',
exc)
raise
else:
# file is already uncompressed
self._log.debug('Using input file which is not compressed: %r',
infile)
outfile = infile
result.append(outfile)
return result
def _connections(self, useCzar, useWorkers):
"""
Returns a list of wmgr "connections", for each conection there is a
tuple (name, connection) where name is something like "czar" or
"worker lsst-dbdev2". If czar connection is included then it
is always first in the list.
@param useCzar: if True then include czar in the list
@param useWorkers: if True then include all workers in the list
"""
res = []
if useCzar:
res += [("czar", self.czarWmgr)]
if useWorkers:
for worker, wmgr in self.workerWmgrMap.items():
res += [('worker ' + worker, wmgr)]
return res
def _deleteTable(self, database, table):
"""
Drop existing table and all chunks.
"""
self._log.info('Deleting existing table %r (and chunks)', table)
for name, wmgr in self._connections(useCzar=True, useWorkers=True):
self._log.info('Deleting table from %r', name)
wmgr.dropTable(database, table, dropChunks=True, mustExist=False)
def _createTable(self, database, table, schema):
"""
Create table in the database. Just executes whatever SQL was given to
us in a schema file. Additionally applies fixes to a schema after loading.
"""
# read table schema
try:
self.schema = open(schema).read()
except Exception as exc:
self._log.critical('Failed to read table schema file: %r', exc)
raise
# create table on czar and every worker
for name, wmgr in self._connections(useCzar=True, useWorkers=True):
self._log.info('Creating table %r in %r', table, name)
chunkColumns = bool(self.partitioned)
try:
wmgr.createTable(database,
table,
schema=self.schema,
chunkColumns=chunkColumns)
except ServerError as exc:
if exc.code == 409:
self._log.info('Table %r exists in %r', table, name)
else:
self._log.critical('Failed to create table %r in %r',
table, name)
raise
def _loadData(self, database, table, files):
"""
Load data into existing table.
"""
if not self.partitioned or (self.oneTable and self.skipPart and files):
# load files given on command line
self._loadNonChunkedData(database, table, files)
else:
# load data from chunk directory
self._loadChunkedData(database, table)
def _chunkFiles(self):
"""
Generator method which returns list of all chunk files. For each chunk returns
a triplet (path:string, chunkId:int, overlap:bool).
"""
for dirpath, _, filenames in os.walk(self.chunksDir, followlinks=True):
for fileName in filenames:
match = self.chunkRe.match(fileName)
if match is not None:
path = os.path.join(dirpath, fileName)
chunkId = int(match.group('id'))
overlap = match.group('ov') is not None
yield (path, chunkId, overlap)
def _loadChunkedData(self, database, table):
"""
Load chunked data into mysql table, if one-table option is specified then all chunks
are loaded into a single table with original name, otherwise we create one table per chunk.
"""
# As we read from partitioner output files we use "out.csv" option for that.
csvPrefix = "out.csv"
for path, chunkId, overlap in self._chunkFiles():
# remember all chunks that we loaded
if not overlap:
self.chunks.add(chunkId)
if self.oneTable:
# just load everything into existing table, do not load overlaps
if not overlap:
self._loadOneFile(self.czarWmgr, database, table, path,
csvPrefix)
else:
self._log.info('Ignore overlap file %r', path)
else:
# Partitioner may potentially produce empty overlap files even
# in cases when we should not make overlap tables. Check and
# filter out empty files or complain about non-empty.
if overlap and not self.partOptions.isSubChunked:
# check contents, try to read some data and strip spaces
data = open(path).read(1024).strip()
if data:
raise RuntimeError(
'Found non-empty overlap file for non-subchunked table: '
+ path)
else:
self._log.info('Ignore empty overlap file %r', path)
continue
if self.workerWmgrMap:
# find database for this chunk
worker = self.chunkMap.worker(chunkId)
wmgr = self.workerWmgrMap.get(worker)
if wmgr is None:
raise RuntimeError(
'Existing chunk mapping is not in the list of workers: '
+ worker)
self._log.info('load chunk %r to worker %r', chunkId,
worker)
else:
# all goes to single node
self._log.info('load chunk %r to czar', chunkId)
wmgr = self.czarWmgr
# make tables if needed
if chunkId not in self.createdChunks:
try:
wmgr.createChunk(database,
table,
chunkId,
overlap=self.partOptions.isSubChunked)
self.createdChunks.add(chunkId)
except ServerError as exc:
if exc.code == 409:
self._log.info('Chunk %r exists for table %r',
chunkId, table)
else:
self._log.critical(
'Failed to create chunk %r for table %r',
chunkId, table)
raise
# load data into chunk table
self._loadOneFile(wmgr,
database,
table,
path,
csvPrefix,
chunkId=chunkId,
overlap=overlap)
@staticmethod
def _chunkTableName(table, chunkId, overlap):
"""
Return full chunk table name or overlap table name.
"""
ctable = table
if overlap:
ctable += 'FullOverlap'
ctable += '_'
ctable += str(chunkId)
return ctable
def _createDummyChunk(self, database, table):
"""
Make special dummy chunk in case of partitioned data.
"""
if not self.partitioned or self.oneTable:
# only do it for true partitioned stuff
return
# this is only needed on worker (or czar if there are no workers)
connections = self._connections(useCzar=False, useWorkers=True)
if not connections:
connections = self._connections(useCzar=True, useWorkers=False)
for name, wmgr in connections:
self._log.info('Make dummy chunk table for %r', table)
# just make regular chunk with special ID, do not load any data
try:
wmgr.createChunk(database,
table,
1234567890,
overlap=self.partOptions.isSubChunked)
except ServerError as exc:
if exc.code == 409:
self._log.info(
'Dummy chunk 1234567890 exists for table %r', table)
else:
self._log.critical(
'Failed to create dummy chunk 1234567890 for table %r',
table)
raise
def _loadNonChunkedData(self, database, table, files):
"""
Load non-chunked data into mysql table. We use (unzipped) files that
we got for input.
"""
# As we read from input files (which are also input files for partitioner)
# we use "in.csv" option for that.
csvPrefix = "in.csv"
# this is only needed on workers (or czar if there are no workers)
connections = self._connections(useCzar=False, useWorkers=True)
if not connections:
connections = self._connections(useCzar=True, useWorkers=False)
for name, wmgr in connections:
self._log.info('load non-chunked data to %r', name)
for file in files:
self._loadOneFile(wmgr, database, table, file, csvPrefix)
def _loadOneFile(self,
wmgr,
database,
table,
path,
csvPrefix,
chunkId=None,
overlap=None):
"""Load data from a single file into existing table"""
self._log.info('load table %r.%r from file %r', database, table, path)
# need to know special characters used in csv
# default delimiter is the same as in partitioner
special_chars = {
'delimiter': '\t',
'enclose': '',
'escape': '\\',
'newline': '\n'
}
data = {}
for name, default in special_chars.items():
data[name] = self.partOptions.get(csvPrefix + '.' + name, default)
try:
file = open(path, "rb")
except IOError as exc:
self._log.error('failed to open file %r', path)
raise
wmgr.loadData(database,
table,
file,
fileName=path,
chunkId=chunkId,
overlap=overlap,
delimiter=data['delimiter'],
enclose=data['enclose'],
escape=data['escape'],
terminate=data['newline'])
def _updateCss(self, database, table):
"""
Update CSS with information about loaded table and database.
"""
# create database in CSS if not there yet
if not self.css.containsDb(database):
self._log.info('Creating database CSS info')
options = self.partOptions.cssDbOptions()
striping = css.StripingParams(options['nStripes'],
options['nSubStripes'], 0,
options['overlap'])
self.css.createDb(database, striping, options['storageClass'],
'RELEASED')
# define options for table
options = self.partOptions.cssTableOptions()
schema = self._schemaForCSS(database, table)
if options.get('match', False):
matchParams = css.MatchTableParams(options['dirTable1'],
options['dirColName1'],
options['dirTable2'],
options['dirColName2'],
options['flagColName'])
self._log.info('Creating table CSS info for match table')
self.css.createMatchTable(database, table, schema, matchParams)
else:
if 'dirTable' in options:
# partitioned table
pParams = css.PartTableParams(
options['dirDb'], options['dirTable'],
options['dirColName'], options['latColName'],
options['lonColName'], options['overlap'], True,
options['subChunks'])
sParams = css.ScanTableParams(options['lockInMem'],
options['scanRating'])
else:
pParams = css.PartTableParams()
sParams = css.ScanTableParams()
self.css.createTable(database, table, schema, pParams, sParams)
# save chunk mapping too
self._log.info('Saving updated chunk map to CSS')
self.chunkMap.save()
def _schemaForCSS(self, database, table):
"""
Returns schema string for CSS, which is a create table only without
create table, only column definitions
"""
schema = self.czarWmgr.tableSchema(database, table)
# strip CREATE TABLE
i = schema.find('(')
return schema[i:]
def _makeEmptyChunks(self):
"""
Generate empty chunks file, should be called after loading is complete.
"""
if not self.emptyChunks:
# need a file name
return
# only makes sense for true partitioned tables
if not self.partitioned:
self._log.info(
'Table is not partitioned, will not make empty chunks file %r',
self.emptyChunks)
return
# max possible number of chunks
nStripes = int(self.partOptions['part.num-stripes'])
maxChunks = 2 * nStripes**2
self._log.info('Making empty chunk list (max.chunk=%d) %r', maxChunks,
self.emptyChunks)
emptyChunkDir = os.path.dirname(self.emptyChunks)
try:
os.makedirs(emptyChunkDir)
except OSError:
if not os.path.isdir(emptyChunkDir):
raise
out = open(self.emptyChunks, 'w')
for chunk in range(maxChunks):
if chunk not in self.chunks:
print(chunk, file=out)
def _makeIndex(self, database, table):
"""
Generate object index in czar meta database.
"""
# only makes sense for director table
if not self.partitioned or \
not self.partOptions.isDirector(database, table) or \
not self.indexDb:
return
metaTable = database + '__' + table
self._log.info('Generating index %r.%r', self.indexDb, metaTable)
# try to delete existing table first
# self.czarWmgr.dropTable(self.indexDb, metaTable, mustExist=False)
# index column
idxCol = self.partOptions['id']
# get index column type from original table
idxColType = 'BIGINT'
for col in self.czarWmgr.tableColumns(database, table):
if col['name'] == idxCol:
idxColType = col['type']
break
# make a table, InnoDB engine is required for scalability
schema = "CREATE TABLE IF NOT EXISTS {table} ({column} {type} NOT NULL PRIMARY KEY, chunkId INT, subChunkId INT)"
schema += " ENGINE = INNODB"
schema = schema.format(table=metaTable, column=idxCol, type=idxColType)
self.czarWmgr.createTable(self.indexDb, metaTable, schema=schema)
# call one of the two methods
if self.workerWmgrMap:
self._makeIndexMultiNode(database, table, metaTable, idxCol)
else:
self._makeIndexSingleNode(database, table, metaTable, idxCol)
def _makeIndexMultiNode(self, database, table, metaTable, idxCol):
"""
Generate object index in czar meta database in case chunks are on a separate
server from index database. It needs to copy all index data over network,
may need special optimization or parameters.
"""
# load data from all chunks
for chunk in self.chunks:
# get worker name for this chunk
wname = self.chunkMap.worker(chunk)
wmgr = self.workerWmgrMap[wname]
self._loadChunkIndex(wmgr, database, table, chunk, metaTable,
idxCol)
def _makeIndexSingleNode(self, database, table, metaTable, idxCol):
"""
Generate object index in czar meta database in case all chunks are also on czar.
"""
# TODO: there is for sure more efficient method than copying data locally
# load data from all chunks
for chunk in self.chunks:
self._loadChunkIndex(self.czarWmgr, database, table, chunk,
metaTable, idxCol)
def _loadChunkIndex(self, wmgr, database, table, chunk, metaTable, idxCol):
"""
Load secondary index with data from a single chunk.
"""
# get index data from worker (or czar)
columns = (idxCol, 'chunkId', 'subChunkId')
indexData = wmgr.getIndex(database,
table,
chunkId=chunk,
columns=columns)
# dump it into a in-memory file, loadData expects binary mode
data = BytesIO()
for row in indexData:
data.write(b"%d\t%d\t%d\n" % tuple(row))
data.seek(0)
# send that file to czar
self.czarWmgr.loadData(self.indexDb, metaTable, data)