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Commit 05572e7f authored by Jim Fulton's avatar Jim Fulton
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Improved zeo blob cache clean up to make it a bit more robust and to 

avoid spurious test failures.
parent e7a6a4b7
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Showing with 101 additions and 70 deletions
src/CHANGES.txt
View file @ 05572e7f
......@@ -14,6 +14,8 @@ Bugs Fixed
- Fixed analyze.py and added test.
- ZEO client blob cache size management is a little bit more robust.
3.9.0b1 (2009-05-04)
====================
......
src/ZEO/ClientStorage.py
View file @ 05572e7f
......@@ -38,6 +38,7 @@ import socket
import stat
import sys
import tempfile
import thread
import threading
import time
import types
......@@ -398,6 +399,7 @@ class ClientStorage(object):
self._blob_cache_size = blob_cache_size
self._blob_data_bytes_loaded = 0
if blob_cache_size is not None:
assert blob_cache_size_check < 100
self._blob_cache_size_check = (
blob_cache_size * blob_cache_size_check / 100)
self._check_blob_size()
......@@ -477,7 +479,7 @@ class ClientStorage(object):
check_blob_size_thread = threading.Thread(
target=_check_blob_cache_size,
args=(self.blob_dir, self._blob_cache_size),
args=(self.blob_dir, target),
)
check_blob_size_thread.setDaemon(True)
check_blob_size_thread.start()
......@@ -1620,7 +1622,6 @@ cache_file_name = re.compile(r'\d+$').match
def _check_blob_cache_size(blob_dir, target):
logger = logging.getLogger(__name__+'.check_blob_cache')
logger.info("Checking blob cache size")
layout = open(os.path.join(blob_dir, ZODB.blob.LAYOUT_MARKER)
).read().strip()
......@@ -1628,63 +1629,89 @@ def _check_blob_cache_size(blob_dir, target):
logger.critical("Invalid blob directory layout %s", layout)
raise ValueError("Invalid blob directory layout", layout)
attempt_path = os.path.join(blob_dir, 'check_size.attempt')
try:
check_lock = zc.lockfile.LockFile(
os.path.join(blob_dir, 'check_size.lock'))
except zc.lockfile.LockError:
# Someone is already cleaning up, so don't bother
logger.info("Another thread is checking the blob cache size")
return
try:
time.sleep(1)
check_lock = zc.lockfile.LockFile(
os.path.join(blob_dir, 'check_size.lock'))
except zc.lockfile.LockError:
# Someone is already cleaning up, so don't bother
logger.debug("%s Another thread is checking the blob cache size.",
thread.get_ident())
open(attempt_path, 'w').close() # Mark that we tried
return
logger.debug("%s Checking blob cache size. (target: %s)",
thread.get_ident(), target)
try:
size = 0
blob_suffix = ZODB.blob.BLOB_SUFFIX
files_by_atime = BTrees.IOBTree.BTree()
for dirname in os.listdir(blob_dir):
if not cache_file_name(dirname):
continue
base = os.path.join(blob_dir, dirname)
if not os.path.isdir(base):
continue
for file_name in os.listdir(base):
if not file_name.endswith(blob_suffix):
while 1:
size = 0
blob_suffix = ZODB.blob.BLOB_SUFFIX
files_by_atime = BTrees.OOBTree.BTree()
for dirname in os.listdir(blob_dir):
if not cache_file_name(dirname):
continue
file_name = os.path.join(base, file_name)
if not os.path.isfile(file_name):
base = os.path.join(blob_dir, dirname)
if not os.path.isdir(base):
continue
stat = os.stat(file_name)
size += stat.st_size
t = int(stat.st_atime)
if t not in files_by_atime:
files_by_atime[t] = []
files_by_atime[t].append(file_name)
logger.info("blob cache size: %s", size)
while size > target and files_by_atime:
for file_name in files_by_atime.pop(files_by_atime.minKey()):
lockfilename = os.path.join(os.path.dirname(file_name),
'.lock')
try:
lock = zc.lockfile.LockFile(lockfilename)
except zc.lockfile.LockError:
logger.info("Skipping locked %s",
os.path.basename(file_name))
continue # In use, skip
for file_name in os.listdir(base):
if not file_name.endswith(blob_suffix):
continue
file_path = os.path.join(base, file_name)
if not os.path.isfile(file_path):
continue
stat = os.stat(file_path)
size += stat.st_size
t = stat.st_atime
if t not in files_by_atime:
files_by_atime[t] = []
files_by_atime[t].append(os.path.join(dirname, file_name))
logger.debug("%s blob cache size: %s", thread.get_ident(), size)
if size <= target:
if os.path.isfile(attempt_path):
os.remove(attempt_path)
continue
logger.debug("%s -->", thread.get_ident())
break
try:
fsize = os.stat(file_name).st_size
while size > target and files_by_atime:
for file_name in files_by_atime.pop(files_by_atime.minKey()):
file_name = os.path.join(blob_dir, file_name)
lockfilename = os.path.join(os.path.dirname(file_name),
'.lock')
try:
ZODB.blob.remove_committed(file_name)
except OSError, v:
pass # probably open on windows
else:
size -= fsize
finally:
lock.close()
lock = zc.lockfile.LockFile(lockfilename)
except zc.lockfile.LockError:
logger.debug("%s Skipping locked %s",
thread.get_ident(),
os.path.basename(file_name))
continue # In use, skip
logger.info("reduced blob cache size: %s", size)
try:
fsize = os.stat(file_name).st_size
try:
ZODB.blob.remove_committed(file_name)
except OSError, v:
pass # probably open on windows
else:
size -= fsize
finally:
lock.close()
if size <= target:
break
logger.debug("%s reduced blob cache size: %s",
thread.get_ident(), size)
finally:
check_lock.close()
......
src/ZEO/tests/zeo_blob_cache.test
View file @ 05572e7f
......@@ -33,6 +33,11 @@ from the server before the cache size is checked. The
blob_cache_size_check option defaults to 100. We passed 10, to check
after writing 10% of the target size.
.. We're going to wait for any threads we started to finish, so...
>>> import threading
>>> old_threads = list(threading.enumerate())
We want to check for name collections in the blob cache dir. We'll try
to provoke name collections by reducing the number of cache directory
subdirectories.
......@@ -66,11 +71,14 @@ directory.
... if os.path.exists(os.path.join(base, f)):
... raise
... return size
>>> db.storage._check_blob_size_thread.join()
>>> cache_size('blobs') < 5000
True
>>> def check():
... return cache_size('blobs') < 5000
>>> def onfail():
... return cache_size('blobs')
>>> from ZEO.tests.forker import wait_until
>>> wait_until("size is reduced", check, 99, onfail)
If we read all of the blobs, data will be downloaded again, as
necessary, but the cache size will remain not much bigger than the
......@@ -81,37 +89,26 @@ target:
... if data != chr(i)*100:
... print 'bad data', `chr(i)`, `data`
>>> db.storage._check_blob_size_thread.join()
>>> cache_size('blobs') < 5000
True
>>> wait_until("size is reduced", check, 99, onfail)
>>> for i in range(1, 101):
... data = conn.root()[i].open().read()
... if data != chr(i)*100:
... print 'bad data', `chr(i)`, `data`
>>> db.storage._check_blob_size_thread.join()
>>> for i in range(1, 101):
... data = conn.root()[i].open('c').read()
... if data != chr(i)*100:
... print 'bad data', `chr(i)`, `data`
>>> db.storage._check_blob_size_thread.join()
>>> cache_size('blobs') < 5000
True
>>> wait_until("size is reduced", check, 99, onfail)
>>> for i in range(1, 101):
... data = open(conn.root()[i].committed(), 'rb').read()
... if data != chr(i)*100:
... print 'bad data', `chr(i)`, `data`
>>> db.storage._check_blob_size_thread.join()
>>> cache_size('blobs') < 5000
True
>>> wait_until("size is reduced", check, 99, onfail)
Now let see if we can stress things a bit. We'll create many clients
and get them to pound on the blobs all at once to see if we can
......@@ -131,7 +128,6 @@ provoke problems:
... data = conn.root()[i].open('c').read()
... if data != chr(i)*100:
... print 'bad data', `chr(i)`, `data`
... db._storage._check_blob_size_thread.join()
... db.close()
>>> threads = [threading.Thread(target=run) for i in range(10)]
......@@ -140,12 +136,18 @@ provoke problems:
>>> for thread in threads:
... thread.start()
>>> for thread in threads:
... thread.join()
... thread.join(99)
... if thread.isAlive():
... print "Can't join thread."
>>> cache_size('blobs') < 5000
True
>>> wait_until("size is reduced", check, 99, onfail)
.. cleanup
>>> for thread in threading.enumerate():
... if thread not in old_threads:
... thread.join(33)
>>> db.close()
>>> ZEO.ClientStorage.BlobCacheLayout.size = orig_blob_cache_layout_size
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