3d3ed34f44
Documentation, including a list of metrics reported and their semantics,
is in the Admin Guide in a new section, "Reporting Metrics to StatsD".
An optional "metric prefix" may be configured which will be prepended to
every metric name sent to StatsD.
Here is the rationale for doing a deep integration like this versus only
sending metrics to StatsD in middleware. It's the only way to report
some internal activities of Swift in a real-time manner. So to have one
way of reporting to StatsD and one place/style of configuration, even
some things (like, say, timing of PUT requests into the proxy-server)
which could be logged via middleware are consistently logged the same
way (deep integration via the logger delegate methods).
When log_statsd_host is configured, get_logger() injects a
swift.common.utils.StatsdClient object into the logger as
logger.statsd_client. Then a set of delegate methods on LogAdapter
either pass through to the StatsdClient object or become no-ops. This
allows StatsD logging to look like:
self.logger.increment('some.metric.here')
and do the right thing in all cases and with no messy conditional logic.
I wanted to use the pystatsd module for the StatsD client, but the
version on PyPi is lagging the git repo (and is missing both the prefix
functionality and timing_since() method). So I wrote my
swift.common.utils.StatsdClient. The interface is the same as
pystatsd.Client, but the code was written from scratch. It's pretty
simple, and the tests I added cover it. This also frees Swift from an
optional dependency on the pystatsd module, making this feature easier
to enable.
There's test coverage for the new code and all existing tests continue
to pass.
Refactored out _one_audit_pass() method in swift/account/auditor.py and
swift/container/auditor.py.
Fixed some misc. PEP8 violations.
Misc test cleanups and refactorings (particularly the way "fake logging"
is handled).
Change-Id: Ie968a9ae8771f59ee7591e2ae11999c44bfe33b2
628 lines
25 KiB
Python
628 lines
25 KiB
Python
# Copyright (c) 2010-2012 OpenStack, LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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from os.path import basename, dirname, isdir, join
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import random
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import shutil
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import time
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import logging
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import hashlib
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import itertools
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import cPickle as pickle
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import errno
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import uuid
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import eventlet
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from eventlet import GreenPool, tpool, Timeout, sleep, hubs
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from eventlet.green import subprocess
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from eventlet.support.greenlets import GreenletExit
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from swift.common.ring import Ring
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from swift.common.utils import whataremyips, unlink_older_than, lock_path, \
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compute_eta, get_logger, write_pickle, renamer, dump_recon_cache, \
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TRUE_VALUES
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from swift.common.bufferedhttp import http_connect
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from swift.common.daemon import Daemon
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from swift.common.http import HTTP_OK, HTTP_INSUFFICIENT_STORAGE
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hubs.use_hub('poll')
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PICKLE_PROTOCOL = 2
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ONE_WEEK = 604800
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HASH_FILE = 'hashes.pkl'
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def quarantine_renamer(device_path, corrupted_file_path):
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"""
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In the case that a file is corrupted, move it to a quarantined
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area to allow replication to fix it.
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:params device_path: The path to the device the corrupted file is on.
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:params corrupted_file_path: The path to the file you want quarantined.
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:returns: path (str) of directory the file was moved to
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:raises OSError: re-raises non errno.EEXIST / errno.ENOTEMPTY
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exceptions from rename
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"""
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from_dir = dirname(corrupted_file_path)
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to_dir = join(device_path, 'quarantined', 'objects', basename(from_dir))
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invalidate_hash(dirname(from_dir))
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try:
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renamer(from_dir, to_dir)
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except OSError, e:
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if e.errno not in (errno.EEXIST, errno.ENOTEMPTY):
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raise
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to_dir = "%s-%s" % (to_dir, uuid.uuid4().hex)
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renamer(from_dir, to_dir)
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return to_dir
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def hash_suffix(path, reclaim_age):
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"""
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Performs reclamation and returns an md5 of all (remaining) files.
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:param reclaim_age: age in seconds at which to remove tombstones
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"""
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md5 = hashlib.md5()
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for hsh in sorted(os.listdir(path)):
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hsh_path = join(path, hsh)
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try:
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files = os.listdir(hsh_path)
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except OSError, err:
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if err.errno == errno.ENOTDIR:
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partition_path = dirname(path)
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objects_path = dirname(partition_path)
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device_path = dirname(objects_path)
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quar_path = quarantine_renamer(device_path, hsh_path)
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logging.exception(
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_('Quarantined %s to %s because it is not a directory') %
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(hsh_path, quar_path))
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continue
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raise
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if len(files) == 1:
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if files[0].endswith('.ts'):
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# remove tombstones older than reclaim_age
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ts = files[0].rsplit('.', 1)[0]
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if (time.time() - float(ts)) > reclaim_age:
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os.unlink(join(hsh_path, files[0]))
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files.remove(files[0])
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elif files:
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files.sort(reverse=True)
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meta = data = tomb = None
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for filename in list(files):
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if not meta and filename.endswith('.meta'):
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meta = filename
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if not data and filename.endswith('.data'):
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data = filename
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if not tomb and filename.endswith('.ts'):
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tomb = filename
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if (filename < tomb or # any file older than tomb
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filename < data or # any file older than data
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(filename.endswith('.meta') and
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filename < meta)): # old meta
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os.unlink(join(hsh_path, filename))
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files.remove(filename)
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if not files:
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os.rmdir(hsh_path)
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for filename in files:
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md5.update(filename)
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try:
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os.rmdir(path)
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except OSError:
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pass
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return md5.hexdigest()
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def invalidate_hash(suffix_dir):
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"""
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Invalidates the hash for a suffix_dir in the partition's hashes file.
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:param suffix_dir: absolute path to suffix dir whose hash needs
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invalidating
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"""
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suffix = os.path.basename(suffix_dir)
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partition_dir = os.path.dirname(suffix_dir)
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hashes_file = join(partition_dir, HASH_FILE)
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with lock_path(partition_dir):
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try:
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with open(hashes_file, 'rb') as fp:
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hashes = pickle.load(fp)
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if suffix in hashes and not hashes[suffix]:
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return
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except Exception:
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return
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hashes[suffix] = None
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write_pickle(hashes, hashes_file, partition_dir, PICKLE_PROTOCOL)
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def get_hashes(partition_dir, recalculate=[], do_listdir=False,
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reclaim_age=ONE_WEEK):
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"""
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Get a list of hashes for the suffix dir. do_listdir causes it to mistrust
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the hash cache for suffix existence at the (unexpectedly high) cost of a
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listdir. reclaim_age is just passed on to hash_suffix.
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:param partition_dir: absolute path of partition to get hashes for
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:param recalculate: list of suffixes which should be recalculated when got
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:param do_listdir: force existence check for all hashes in the partition
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:param reclaim_age: age at which to remove tombstones
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:returns: tuple of (number of suffix dirs hashed, dictionary of hashes)
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"""
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hashed = 0
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hashes_file = join(partition_dir, HASH_FILE)
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with lock_path(partition_dir):
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modified = False
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hashes = {}
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try:
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with open(hashes_file, 'rb') as fp:
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hashes = pickle.load(fp)
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except Exception:
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do_listdir = True
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if do_listdir:
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hashes = dict(((suff, hashes.get(suff, None))
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for suff in os.listdir(partition_dir)
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if len(suff) == 3 and isdir(join(partition_dir, suff))))
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modified = True
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for hash_ in recalculate:
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hashes[hash_] = None
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for suffix, hash_ in hashes.items():
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if not hash_:
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suffix_dir = join(partition_dir, suffix)
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if os.path.exists(suffix_dir):
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try:
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hashes[suffix] = hash_suffix(suffix_dir, reclaim_age)
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hashed += 1
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except OSError:
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logging.exception(_('Error hashing suffix'))
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hashes[suffix] = None
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else:
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del hashes[suffix]
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modified = True
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sleep()
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if modified:
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write_pickle(hashes, hashes_file, partition_dir, PICKLE_PROTOCOL)
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return hashed, hashes
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def tpooled_get_hashes(*args, **kwargs):
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"""
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Hack to work around Eventlet's tpool not catching and reraising Timeouts.
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We return the Timeout, Timeout if it's raised, the caller looks for it
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and reraises it if found.
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"""
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try:
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return get_hashes(*args, **kwargs)
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except Timeout, err:
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return err, err
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class ObjectReplicator(Daemon):
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"""
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Replicate objects.
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Encapsulates most logic and data needed by the object replication process.
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Each call to .replicate() performs one replication pass. It's up to the
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caller to do this in a loop.
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"""
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def __init__(self, conf):
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"""
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:param conf: configuration object obtained from ConfigParser
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:param logger: logging object
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"""
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self.conf = conf
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self.logger = get_logger(conf, log_route='object-replicator')
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self.devices_dir = conf.get('devices', '/srv/node')
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self.mount_check = conf.get('mount_check', 'true').lower() in \
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('true', 't', '1', 'on', 'yes', 'y')
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self.vm_test_mode = conf.get(
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'vm_test_mode', 'no').lower() in ('yes', 'true', 'on', '1')
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self.swift_dir = conf.get('swift_dir', '/etc/swift')
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self.port = int(conf.get('bind_port', 6000))
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self.concurrency = int(conf.get('concurrency', 1))
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self.stats_interval = int(conf.get('stats_interval', '300'))
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self.object_ring = Ring(self.swift_dir, ring_name='object')
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self.ring_check_interval = int(conf.get('ring_check_interval', 15))
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self.next_check = time.time() + self.ring_check_interval
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self.reclaim_age = int(conf.get('reclaim_age', 86400 * 7))
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self.partition_times = []
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self.run_pause = int(conf.get('run_pause', 30))
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self.rsync_timeout = int(conf.get('rsync_timeout', 900))
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self.rsync_io_timeout = conf.get('rsync_io_timeout', '30')
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self.http_timeout = int(conf.get('http_timeout', 60))
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self.lockup_timeout = int(conf.get('lockup_timeout', 1800))
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self.recon_enable = conf.get(
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'recon_enable', 'no').lower() in TRUE_VALUES
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self.recon_cache_path = conf.get(
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'recon_cache_path', '/var/cache/swift')
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self.recon_object = os.path.join(self.recon_cache_path, "object.recon")
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def _rsync(self, args):
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"""
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Execute the rsync binary to replicate a partition.
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:returns: return code of rsync process. 0 is successful
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"""
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start_time = time.time()
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ret_val = None
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try:
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with Timeout(self.rsync_timeout):
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proc = subprocess.Popen(args, stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT)
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results = proc.stdout.read()
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ret_val = proc.wait()
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except Timeout:
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self.logger.error(_("Killing long-running rsync: %s"), str(args))
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proc.kill()
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return 1 # failure response code
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total_time = time.time() - start_time
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for result in results.split('\n'):
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if result == '':
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continue
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if result.startswith('cd+'):
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continue
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if not ret_val:
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self.logger.info(result)
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else:
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self.logger.error(result)
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if ret_val:
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self.logger.error(_('Bad rsync return code: %(args)s -> %(ret)d'),
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{'args': str(args), 'ret': ret_val})
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elif results:
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self.logger.info(
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_("Successful rsync of %(src)s at %(dst)s (%(time).03f)"),
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{'src': args[-2], 'dst': args[-1], 'time': total_time})
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else:
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self.logger.debug(
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_("Successful rsync of %(src)s at %(dst)s (%(time).03f)"),
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{'src': args[-2], 'dst': args[-1], 'time': total_time})
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return ret_val
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def rsync(self, node, job, suffixes):
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"""
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Synchronize local suffix directories from a partition with a remote
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node.
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:param node: the "dev" entry for the remote node to sync with
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:param job: information about the partition being synced
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:param suffixes: a list of suffixes which need to be pushed
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:returns: boolean indicating success or failure
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"""
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if not os.path.exists(job['path']):
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return False
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args = [
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'rsync',
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'--recursive',
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'--whole-file',
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'--human-readable',
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'--xattrs',
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'--itemize-changes',
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'--ignore-existing',
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'--timeout=%s' % self.rsync_io_timeout,
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'--contimeout=%s' % self.rsync_io_timeout,
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]
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if self.vm_test_mode:
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rsync_module = '[%s]::object%s' % (node['ip'], node['port'])
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else:
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rsync_module = '[%s]::object' % node['ip']
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had_any = False
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for suffix in suffixes:
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spath = join(job['path'], suffix)
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if os.path.exists(spath):
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args.append(spath)
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had_any = True
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if not had_any:
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return False
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args.append(join(rsync_module, node['device'],
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'objects', job['partition']))
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return self._rsync(args) == 0
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def check_ring(self):
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"""
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Check to see if the ring has been updated
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:returns: boolean indicating whether or not the ring has changed
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"""
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if time.time() > self.next_check:
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self.next_check = time.time() + self.ring_check_interval
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if self.object_ring.has_changed():
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return False
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return True
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def update_deleted(self, job):
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"""
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High-level method that replicates a single partition that doesn't
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belong on this node.
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:param job: a dict containing info about the partition to be replicated
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"""
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def tpool_get_suffixes(path):
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return [suff for suff in os.listdir(path)
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if len(suff) == 3 and isdir(join(path, suff))]
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self.replication_count += 1
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self.logger.increment('partition.delete.count.%s' % (job['device'],))
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begin = time.time()
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try:
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responses = []
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suffixes = tpool.execute(tpool_get_suffixes, job['path'])
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if suffixes:
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for node in job['nodes']:
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success = self.rsync(node, job, suffixes)
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if success:
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with Timeout(self.http_timeout):
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http_connect(node['ip'], node['port'],
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node['device'], job['partition'], 'REPLICATE',
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'/' + '-'.join(suffixes),
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headers={'Content-Length': '0'}).getresponse().read()
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responses.append(success)
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if not suffixes or (len(responses) == \
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len(job['nodes']) and all(responses)):
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self.logger.info(_("Removing partition: %s"), job['path'])
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tpool.execute(shutil.rmtree, job['path'], ignore_errors=True)
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except (Exception, Timeout):
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self.logger.exception(_("Error syncing handoff partition"))
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finally:
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self.partition_times.append(time.time() - begin)
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self.logger.timing_since('partition.delete.timing', begin)
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def update(self, job):
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"""
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High-level method that replicates a single partition.
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:param job: a dict containing info about the partition to be replicated
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"""
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self.replication_count += 1
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self.logger.increment('partition.update.count.%s' % (job['device'],))
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begin = time.time()
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try:
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hashed, local_hash = tpool.execute(tpooled_get_hashes, job['path'],
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do_listdir=(self.replication_count % 10) == 0,
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reclaim_age=self.reclaim_age)
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# See tpooled_get_hashes "Hack".
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if isinstance(hashed, BaseException):
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raise hashed
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self.suffix_hash += hashed
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self.logger.update_stats('suffix.hashes', hashed)
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attempts_left = len(job['nodes'])
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nodes = itertools.chain(job['nodes'],
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self.object_ring.get_more_nodes(int(job['partition'])))
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while attempts_left > 0:
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# If this throws StopIterator it will be caught way below
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node = next(nodes)
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attempts_left -= 1
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try:
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with Timeout(self.http_timeout):
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resp = http_connect(node['ip'], node['port'],
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node['device'], job['partition'], 'REPLICATE',
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'', headers={'Content-Length': '0'}).getresponse()
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if resp.status == HTTP_INSUFFICIENT_STORAGE:
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self.logger.error(_('%(ip)s/%(device)s responded'
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' as unmounted'), node)
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attempts_left += 1
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continue
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if resp.status != HTTP_OK:
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self.logger.error(_("Invalid response %(resp)s "
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"from %(ip)s"),
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{'resp': resp.status, 'ip': node['ip']})
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continue
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remote_hash = pickle.loads(resp.read())
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del resp
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suffixes = [suffix for suffix in local_hash if
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local_hash[suffix] != remote_hash.get(suffix, -1)]
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if not suffixes:
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continue
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hashed, recalc_hash = tpool.execute(tpooled_get_hashes,
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job['path'], recalculate=suffixes,
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reclaim_age=self.reclaim_age)
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# See tpooled_get_hashes "Hack".
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if isinstance(hashed, BaseException):
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raise hashed
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self.logger.update_stats('suffix.hashes', hashed)
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local_hash = recalc_hash
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suffixes = [suffix for suffix in local_hash if
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local_hash[suffix] != remote_hash.get(suffix, -1)]
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self.rsync(node, job, suffixes)
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with Timeout(self.http_timeout):
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conn = http_connect(node['ip'], node['port'],
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node['device'], job['partition'], 'REPLICATE',
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'/' + '-'.join(suffixes),
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headers={'Content-Length': '0'})
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conn.getresponse().read()
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self.suffix_sync += len(suffixes)
|
|
self.logger.update_stats('suffix.syncs', len(suffixes))
|
|
except (Exception, Timeout):
|
|
self.logger.exception(_("Error syncing with node: %s") %
|
|
node)
|
|
self.suffix_count += len(local_hash)
|
|
except (Exception, Timeout):
|
|
self.logger.exception(_("Error syncing partition"))
|
|
finally:
|
|
self.partition_times.append(time.time() - begin)
|
|
self.logger.timing_since('partition.update.timing', begin)
|
|
|
|
def stats_line(self):
|
|
"""
|
|
Logs various stats for the currently running replication pass.
|
|
"""
|
|
if self.replication_count:
|
|
elapsed = (time.time() - self.start) or 0.000001
|
|
rate = self.replication_count / elapsed
|
|
self.logger.info(_("%(replicated)d/%(total)d (%(percentage).2f%%)"
|
|
" partitions replicated in %(time).2fs (%(rate).2f/sec, "
|
|
"%(remaining)s remaining)"),
|
|
{'replicated': self.replication_count, 'total': self.job_count,
|
|
'percentage': self.replication_count * 100.0 / self.job_count,
|
|
'time': time.time() - self.start, 'rate': rate,
|
|
'remaining': '%d%s' % compute_eta(self.start,
|
|
self.replication_count, self.job_count)})
|
|
if self.suffix_count:
|
|
self.logger.info(_("%(checked)d suffixes checked - "
|
|
"%(hashed).2f%% hashed, %(synced).2f%% synced"),
|
|
{'checked': self.suffix_count,
|
|
'hashed': (self.suffix_hash * 100.0) / self.suffix_count,
|
|
'synced': (self.suffix_sync * 100.0) / self.suffix_count})
|
|
self.partition_times.sort()
|
|
self.logger.info(_("Partition times: max %(max).4fs, "
|
|
"min %(min).4fs, med %(med).4fs"),
|
|
{'max': self.partition_times[-1],
|
|
'min': self.partition_times[0],
|
|
'med': self.partition_times[
|
|
len(self.partition_times) // 2]})
|
|
else:
|
|
self.logger.info(_("Nothing replicated for %s seconds."),
|
|
(time.time() - self.start))
|
|
|
|
def kill_coros(self):
|
|
"""Utility function that kills all coroutines currently running."""
|
|
for coro in list(self.run_pool.coroutines_running):
|
|
try:
|
|
coro.kill(GreenletExit)
|
|
except GreenletExit:
|
|
pass
|
|
|
|
def heartbeat(self):
|
|
"""
|
|
Loop that runs in the background during replication. It periodically
|
|
logs progress.
|
|
"""
|
|
while True:
|
|
eventlet.sleep(self.stats_interval)
|
|
self.stats_line()
|
|
|
|
def detect_lockups(self):
|
|
"""
|
|
In testing, the pool.waitall() call very occasionally failed to return.
|
|
This is an attempt to make sure the replicator finishes its replication
|
|
pass in some eventuality.
|
|
"""
|
|
while True:
|
|
eventlet.sleep(self.lockup_timeout)
|
|
if self.replication_count == self.last_replication_count:
|
|
self.logger.error(_("Lockup detected.. killing live coros."))
|
|
self.kill_coros()
|
|
self.last_replication_count = self.replication_count
|
|
|
|
def collect_jobs(self):
|
|
"""
|
|
Returns a sorted list of jobs (dictionaries) that specify the
|
|
partitions, nodes, etc to be rsynced.
|
|
"""
|
|
jobs = []
|
|
ips = whataremyips()
|
|
for local_dev in [dev for dev in self.object_ring.devs
|
|
if dev and dev['ip'] in ips and dev['port'] == self.port]:
|
|
dev_path = join(self.devices_dir, local_dev['device'])
|
|
obj_path = join(dev_path, 'objects')
|
|
tmp_path = join(dev_path, 'tmp')
|
|
if self.mount_check and not os.path.ismount(dev_path):
|
|
self.logger.warn(_('%s is not mounted'), local_dev['device'])
|
|
continue
|
|
unlink_older_than(tmp_path, time.time() - self.reclaim_age)
|
|
if not os.path.exists(obj_path):
|
|
continue
|
|
for partition in os.listdir(obj_path):
|
|
try:
|
|
part_nodes = \
|
|
self.object_ring.get_part_nodes(int(partition))
|
|
nodes = [node for node in part_nodes
|
|
if node['id'] != local_dev['id']]
|
|
jobs.append(dict(path=join(obj_path, partition),
|
|
device=local_dev['device'],
|
|
nodes=nodes,
|
|
delete=len(nodes) > len(part_nodes) - 1,
|
|
partition=partition))
|
|
except ValueError:
|
|
continue
|
|
random.shuffle(jobs)
|
|
# Partititons that need to be deleted take priority
|
|
jobs.sort(key=lambda job: not job['delete'])
|
|
self.job_count = len(jobs)
|
|
return jobs
|
|
|
|
def replicate(self):
|
|
"""Run a replication pass"""
|
|
self.start = time.time()
|
|
self.suffix_count = 0
|
|
self.suffix_sync = 0
|
|
self.suffix_hash = 0
|
|
self.replication_count = 0
|
|
self.last_replication_count = -1
|
|
self.partition_times = []
|
|
stats = eventlet.spawn(self.heartbeat)
|
|
lockup_detector = eventlet.spawn(self.detect_lockups)
|
|
eventlet.sleep() # Give spawns a cycle
|
|
try:
|
|
self.run_pool = GreenPool(size=self.concurrency)
|
|
jobs = self.collect_jobs()
|
|
for job in jobs:
|
|
if not self.check_ring():
|
|
self.logger.info(_("Ring change detected. Aborting "
|
|
"current replication pass."))
|
|
return
|
|
if job['delete']:
|
|
self.run_pool.spawn(self.update_deleted, job)
|
|
else:
|
|
self.run_pool.spawn(self.update, job)
|
|
with Timeout(self.lockup_timeout):
|
|
self.run_pool.waitall()
|
|
except (Exception, Timeout):
|
|
self.logger.exception(_("Exception in top-level replication loop"))
|
|
self.kill_coros()
|
|
finally:
|
|
stats.kill()
|
|
lockup_detector.kill()
|
|
self.stats_line()
|
|
|
|
def run_once(self, *args, **kwargs):
|
|
start = time.time()
|
|
self.logger.info(_("Running object replicator in script mode."))
|
|
self.replicate()
|
|
total = (time.time() - start) / 60
|
|
self.logger.info(
|
|
_("Object replication complete. (%.02f minutes)"), total)
|
|
if self.recon_enable:
|
|
try:
|
|
dump_recon_cache('object_replication_time', total, \
|
|
self.recon_object)
|
|
except (Exception, Timeout):
|
|
self.logger.exception(_('Exception dumping recon cache'))
|
|
|
|
def run_forever(self, *args, **kwargs):
|
|
self.logger.info(_("Starting object replicator in daemon mode."))
|
|
# Run the replicator continually
|
|
while True:
|
|
start = time.time()
|
|
self.logger.info(_("Starting object replication pass."))
|
|
# Run the replicator
|
|
self.replicate()
|
|
total = (time.time() - start) / 60
|
|
self.logger.info(
|
|
_("Object replication complete. (%.02f minutes)"), total)
|
|
if self.recon_enable:
|
|
try:
|
|
dump_recon_cache('object_replication_time', total, \
|
|
self.recon_object)
|
|
except (Exception, Timeout):
|
|
self.logger.exception(_('Exception dumping recon cache'))
|
|
self.logger.debug(_('Replication sleeping for %s seconds.'),
|
|
self.run_pause)
|
|
sleep(self.run_pause)
|