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https://issues.apache.org/jira/browse/CASSANDRA-12979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15800274#comment-15800274
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Jon Haddad commented on CASSANDRA-12979:
----------------------------------------
Posting patch files for 2.2, 3.0 and trunk tonight. I created a 500MB
partition and put my data directory on it. I changed memtable_heap_space_in_mb
to 10 and ran a cassandra-stress write workload with defaults. The writes
proceed as normal till disk space is almost full, then correctly drop sstables
out of the {{CompactionTask}} until there's enough space to run the compaction.
{code}
INFO 04:16:52 Writing Memtable-standard1@453545543(994.383KiB serialized
bytes, 22330 ops, 32%/0% of on/off-heap limit)
INFO 04:16:52 Writing Memtable-standard1@1954443352(995.941KiB serialized
bytes, 22365 ops, 32%/0% of on/off-heap limit)
INFO 04:16:52 Writing Memtable-standard1@430003003(995.496KiB serialized
bytes, 22355 ops, 32%/0% of on/off-heap limit)
INFO 04:16:52 Writing Memtable-standard1@546357542(993.938KiB serialized
bytes, 22320 ops, 32%/0% of on/off-heap limit)
INFO 04:16:53 Writing Memtable-standard1@483193746(995.273KiB serialized
bytes, 22350 ops, 32%/0% of on/off-heap limit)
INFO 04:16:53 Writing Memtable-standard1@477708562(995.941KiB serialized
bytes, 22365 ops, 32%/0% of on/off-heap limit)
INFO 04:16:53 Writing Memtable-standard1@198137254(993.270KiB serialized
bytes, 22305 ops, 32%/0% of on/off-heap limit)
INFO 04:16:53 Writing Memtable-compactions_in_progress@2062736652(0.008KiB
serialized bytes, 1 ops, 0%/0% of on/off-heap limit)
INFO 04:16:53 Writing Memtable-compactions_in_progress@967481321(0.008KiB
serialized bytes, 1 ops, 0%/0% of on/off-heap limit)
WARN 04:16:53 insufficient space to compact all requested files. 121.46146MB
required,
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-263-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-282-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-268-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-283-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-277-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-262-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-273-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-264-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-281-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-267-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-272-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-255-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-276-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-280-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-270-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-265-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-271-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-260-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-275-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-269-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-279-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-266-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-261-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-278-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-274-big-Data.db')
WARN 04:16:53 Not enough space for compaction, 121.46146MB estimated.
Reducing scope.
WARN 04:16:53 insufficient space to compact all requested files. 72.13821MB
required,
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-263-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-282-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-268-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-283-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-277-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-262-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-273-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-264-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-281-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-267-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-272-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-276-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-280-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-270-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-265-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-271-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-260-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-275-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-269-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-279-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-266-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-261-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-278-big-Data.db'),
BigTableReader(path='/Volumes/tiny/keyspace1/standard1-97042950d2fd11e685f763d5e2282bc6/lb-274-big-Data.db')
WARN 04:16:53 Not enough space for compaction, 72.13821MB estimated. Reducing
scope.
INFO 04:16:53 Writing Memtable-compactions_in_progress@2049879518(0.482KiB
serialized bytes, 28 ops, 0%/0% of on/off-heap limit)
INFO 04:16:54 Writing Memtable-standard1@1622288656(992.602KiB serialized
bytes, 22290 ops, 32%/0% of on/off-heap limit)
INFO 04:16:54 Writing Memtable-standard1@1956423559(992.379KiB serialized
bytes, 22285 ops, 32%/0% of on/off-heap limit)
INFO 04:16:54 Writing Memtable-compactions_in_progress@1018281242(0.148KiB
serialized bytes, 9 ops, 0%/0% of on/off-heap limit)
{code}
> checkAvailableDiskSpace doesn't update expectedWriteSize when reducing thread
> scope
> -----------------------------------------------------------------------------------
>
> Key: CASSANDRA-12979
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12979
> Project: Cassandra
> Issue Type: Bug
> Reporter: Jon Haddad
> Assignee: Jon Haddad
> Fix For: 2.2.9, 3.0.11, 4.0, 3.x
>
>
> If a compaction occurs that looks like it'll take up more space than
> remaining disk available, the compaction manager attempts to reduce the scope
> of the compaction by calling {{reduceScopeForLimitedSpace()}} repeatedly.
> Unfortunately, the while loop passes the {{estimatedWriteSize}} calculated
> from the original call to {{hasAvailableDiskSpace}}, so the comparisons that
> are done will always be against the size of the original compaction, rather
> than the reduced scope one.
> Full method below:
> {code}
> protected void checkAvailableDiskSpace(long estimatedSSTables, long
> expectedWriteSize)
> {
> if(!cfs.isCompactionDiskSpaceCheckEnabled() && compactionType ==
> OperationType.COMPACTION)
> {
> logger.info("Compaction space check is disabled");
> return;
> }
> while (!getDirectories().hasAvailableDiskSpace(estimatedSSTables,
> expectedWriteSize))
> {
> if (!reduceScopeForLimitedSpace())
> throw new RuntimeException(String.format("Not enough space
> for compaction, estimated sstables = %d, expected write size = %d",
> estimatedSSTables, expectedWriteSize));
>
> }
> }
> {code}
> I'm proposing to recalculate the {{estimatedSSTables}} and
> {{expectedWriteSize}} after each iteration of {{reduceScopeForLimitedSpace}}.
>
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