def pssh_run(self, hosts, command, hosts_variables=None, ssh_client=None):
"""
Runs a command on hosts list using pssh under the hood
Return: True (success) or False (error)
"""
if ssh_client is None:
ssh_client = ParallelSSHClient
pssh_run_success = False
success = []
error = []
i = 1
username = self.config.ssh.username if self.config.ssh.username != '' else None
port = int(self.config.ssh.port)
pkey = self.config.ssh.key_file if self.config.ssh.key_file != '' else None
cert_file = self.config.ssh.cert_file if self.config.ssh.cert_file != '' else None
logging.info('Executing "{command}" on following nodes {hosts} with a parallelism/pool size of {pool_size}'
.format(command=command, hosts=hosts, pool_size=self.pool_size))
for parallel_hosts in divide_chunks(hosts, self.pool_size):
client = ssh_client(parallel_hosts,
forward_ssh_agent=True,
pool_size=len(parallel_hosts),
user=username,
port=port,
pkey=pkey,
cert_file=cert_file)
logging.debug('Batch #{i}: Running "{command}" on nodes {hosts} parallelism of {pool_size}'
.format(i=i, command=command, hosts=parallel_hosts, pool_size=len(parallel_hosts)))
output = client.run_command(command, host_args=hosts_variables,
sudo=medusa.utils.evaluate_boolean(self.config.cassandra.use_sudo))
client.join(output)
success = success + list(filter(lambda host_output: host_output.exit_code == 0, output))
error = error + list(filter(lambda host_output: host_output.exit_code != 0, output))
# Report on execution status
if len(success) == len(hosts):
logging.info('Job executing "{}" ran and finished Successfully on all nodes.'
.format(command))
pssh_run_success = True
elif len(error) > 0:
logging.error('Job executing "{}" ran and finished with errors on following nodes: {}'
.format(command, sorted(set(map(lambda host_output: host_output.host, error)))))
display_output(error)
else:
err_msg = 'Something unexpected happened while running pssh command'
logging.error(err_msg)
raise Exception(err_msg)
return pssh_run_success
def download_data(storageconfig, backup, fqtns_to_restore, destination):
storage = Storage(config=storageconfig)
manifest = json.loads(backup.manifest)
for section in manifest:
fqtn = "{}.{}".format(section['keyspace'], section['columnfamily'])
dst = destination / section['keyspace'] / section['columnfamily']
srcs = [
'{}{}'.format(
storage.storage_driver.get_path_prefix(backup.data_path),
obj['path']) for obj in section['objects']
]
if len(srcs) > 0 and (len(fqtns_to_restore) == 0
or fqtn in fqtns_to_restore):
logging.debug('Downloading %s files to %s', len(srcs), dst)
dst.mkdir(parents=True)
# check for hidden sub-folders in the table directory
# (e.g. secondary indices which live in table/.table_idx)
dst_subfolders = {
dst / src.parent.name
for src in map(pathlib.Path, srcs)
if src.parent.name.startswith('.')
}
# create the sub-folders so the downloads actually work
for subfolder in dst_subfolders:
subfolder.mkdir(parents=False)
for src_batch in divide_chunks(srcs, GSUTIL_MAX_FILES_PER_CHUNK):
storage.storage_driver.download_blobs(src_batch, dst)
elif len(srcs) == 0 and (len(fqtns_to_restore) == 0
or fqtn in fqtns_to_restore):
logging.debug('There is nothing to download for {}'.format(fqtn))
else:
logging.debug(
'Download of {} was not requested, skipping'.format(fqtn))
logging.info('Downloading backup metadata...')
storage.storage_driver.download_blobs(srcs=[
'{}'.format(path) for path in
[backup.manifest_path, backup.schema_path, backup.tokenmap_path]
],
dest=destination)
def backup_snapshots(storage, manifest, node_backup, node_backup_cache,
snapshot):
try:
num_files = 0
for snapshot_path in snapshot.find_dirs():
logging.debug("Backing up {}".format(snapshot_path))
(needs_backup, already_backed_up
) = node_backup_cache.replace_or_remove_if_cached(
keyspace=snapshot_path.keyspace,
columnfamily=snapshot_path.columnfamily,
srcs=list(snapshot_path.list_files()))
num_files += len(needs_backup) + len(already_backed_up)
dst_path = str(
node_backup.datapath(keyspace=snapshot_path.keyspace,
columnfamily=snapshot_path.columnfamily))
logging.debug("destination path: {}".format(dst_path))
manifest_objects = list()
if len(needs_backup) > 0:
# If there is a plenty of files to upload it should be
# splitted to batches due to 'gsutil cp' which
# can't handle too much source files via STDIN.
for src_batch in divide_chunks(needs_backup,
GSUTIL_MAX_FILES_PER_CHUNK):
manifest_objects += storage.storage_driver.upload_blobs(
src_batch, dst_path)
# Reintroducing already backed up objects in the manifest in differential
for obj in already_backed_up:
manifest_objects.append(obj)
manifest.append(
make_manifest_object(node_backup.fqdn, snapshot_path,
manifest_objects, storage))
return num_files
except Exception as e:
logging.error('This error happened during the backup: {}'.format(
str(e)))
traceback.print_exc()
raise e
