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#!/usr/bin/env python
#
# Public Domain 2014-2018 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
import fnmatch, os, time
import wiredtiger, wttest
from wiredtiger import stat
from wtdataset import SimpleDataSet
# test_bug019.py
# Test that pre-allocating log files only pre-allocates a small number.
class test_bug019(wttest.WiredTigerTestCase):
conn_config = 'log=(enabled,file_max=100K),statistics=(fast)'
uri = "table:bug019"
entries = 5000
max_prealloc = 1
# Modify rows so we write log records. We're writing a lot more than a
# single log file, so we know the underlying library will churn through
# log files.
def get_prealloc_stat(self):
stat_cursor = self.session.open_cursor('statistics:', None, None)
prealloc = stat_cursor[stat.conn.log_prealloc_max][2]
stat_cursor.close()
return prealloc
def populate(self, nentries):
c = self.session.open_cursor(self.uri, None, None)
for i in range(0, nentries):
# Make the values about 200 bytes. That's about 1MB of data for
# 5000 records, generating 10 log files used plus more for overhead.
c[i] = "abcde" * 40
if i % 500 == 0:
prealloc = self.get_prealloc_stat()
if prealloc > self.max_prealloc:
self.max_prealloc = prealloc
c.close()
# Wait for a log file to be pre-allocated. Avoid timing problems, but
# assert a file is created within 30 seconds.
def prepfiles(self):
for i in range(1,30):
f = fnmatch.filter(os.listdir('.'), "*Prep*")
if f:
return f
time.sleep(1.0)
self.assertFalse(not f)
# There was a bug where pre-allocated log files accumulated on
# Windows systems due to an issue with the directory list code.
def test_bug019(self):
# Create a table just to write something into the log.
self.session.create(self.uri, 'key_format=i,value_format=S')
start_prealloc = self.get_prealloc_stat()
self.populate(self.entries)
self.session.checkpoint()
self.assertTrue(self.max_prealloc > start_prealloc)
# Loop, making sure pre-allocation is working and the range is moving.
older = self.prepfiles()
for i in range(1, 10):
self.populate(self.entries)
newer = self.prepfiles()
# Files can be returned in any order when reading a directory, older
# pre-allocated files can persist longer than newer files when newer
# files are returned first. Confirm files are being consumed.
self.assertFalse(set(older) < set(newer))
older = newer
self.session.checkpoint()
# Wait for a long time for pre-allocate to drop in an idle system
# it should usually be fast, but on slow systems can take time.
max_wait_time = 90
for sleepcount in range(1,max_wait_time):
new_prealloc = self.get_prealloc_stat()
if new_prealloc < self.max_prealloc:
break
time.sleep(1.0)
self.assertTrue(sleepcount < max_wait_time)
if __name__ == '__main__':
wttest.run()
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