def migrate(fin, fout, avsc):
"Migrate data from MongoDB (muri) to HDFS (huri)"
auri = avsc if avsc.startswith('avroio:') else 'avroio:%s' % avsc
astg = AvroStorage(auri)
# read data from MongoDB
data = json.load(open(fin))
# store data to Avro
wmaid = astg.file_write(fout, data)
print("Wrote %s, wmaid=%s" % (fout, wmaid))
def __init__(self, uri):
"ctor with STS uri"
if uri.startswith('mongo'):
self.mgr = MongoStorage(uri)
elif uri.startswith('file'):
self.mgr = FileStorage(uri)
elif uri.startswith('avro'):
self.mgr = AvroStorage(uri)
else:
self.mgr = FileStorage(os.getenv('WMA_STORAGE_ROOT', '/tmp/wma_storage'))
self.stype = self.mgr.stype # determine storage type
def migrate(muri, dbname, odir, mdir, avsc, thr, compress, chunk,
close2midnight, dtype):
"Write data from MongoDB (muri) to avro file(s) on local file system"
mstg = MongoStorage(muri, dbname)
auri = avsc if avsc.startswith('avroio:') else 'avroio:%s' % avsc
astg = AvroStorage(auri)
# read data from MongoDB for given storage and document types
query = {'stype': mstg.stype, 'dtype': dtype}
mdocs = mstg.find(query, None) # with no fields we'll get entire docs
# loop over provided docs and write them into avro file on local file system
wmaids = []
total = 0
fsize = 0
fname = file_name(odir, mdir, thr, compress, close2midnight)
while True:
data = [r for r in itertools.islice(mdocs, chunk)]
total += len(data)
if not len(data):
break
ids = astg.file_write(fname, data)
if os.path.isfile(fname):
fsize = os.path.getsize(fname)
wmaids += ids
if ids:
# update status attributes of docs in MongoDB
spec = {'$set': {'stype': astg.stype}}
mstg.update(ids, spec)
try:
if PSUTIL:
pid = os.getpid()
proc = psutil.Process(pid)
mem = proc.memory_info_ex()
rss = 'RSS:%s' % size_format(mem.rss)
else:
rss = ''
except:
rss = ''
print(tstamp('mongo2avro'), "%s docs %s %s (%s bytes) %s" \
% (len(ids), fname, size_format(fsize), fsize, rss))
fname = file_name(odir, mdir, thr, compress, close2midnight)
print(tstamp('mongo2avro'),
"wrote %s docs out of %s" % (len(wmaids), total))
def setUp(self):
self.tdir = tempfile.mkdtemp()
data = {
"int": 1,
"float": 1.2,
"list": [1, 2, 3],
"dict": {
"dname": "foo",
"dval": 1
},
"listdict": [{
"lname": "foo"
}],
"str": "string"
}
self.bare_data = dict(data)
data['wmaid'] = wmaHash(data)
data['stype'] = 'avroio'
self.data = data
schema = gen_schema(self.data)
sname = os.path.join(self.tdir, 'schema.avsc')
with open(sname, 'w') as ostream:
ostream.write(json.dumps(schema))
self.mgr = AvroStorage('avroio:%s' % sname)
