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https://issues.apache.org/jira/browse/CASSANDRA-6142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13796515#comment-13796515
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Marcus Eriksson commented on CASSANDRA-6142:
--------------------------------------------
CompactionsPurgeTest fails:
{noformat}
[junit] Testsuite: org.apache.cassandra.db.compaction.CompactionsPurgeTest
[junit] Tests run: 6, Failures: 2, Errors: 0, Skipped: 0, Time elapsed:
9.365 sec
[junit]
[junit] Testcase:
testMinTimestampPurge(org.apache.cassandra.db.compaction.CompactionsPurgeTest):
FAILED
[junit] expected:<2> but was:<1>
[junit] junit.framework.AssertionFailedError: expected:<2> but was:<1>
[junit] at
org.apache.cassandra.db.compaction.CompactionsPurgeTest.testMinTimestampPurge(CompactionsPurgeTest.java:185)
[junit]
[junit]
[junit] Testcase:
testCompactionPurgeTombstonedRow(org.apache.cassandra.db.compaction.CompactionsPurgeTest):
FAILED
[junit] expected:<10> but was:<5>
[junit] junit.framework.AssertionFailedError: expected:<10> but was:<5>
[junit] at
org.apache.cassandra.db.compaction.CompactionsPurgeTest.testCompactionPurgeTombstonedRow(CompactionsPurgeTest.java:313)
[junit]
[junit]
[junit] Test org.apache.cassandra.db.compaction.CompactionsPurgeTest FAILED
{noformat}
and a few nits:
in LazilyCompactedRow:
* make reducer and merger final
* remove comment about reducer being null on row 123
> Remove multithreaded compaction
> -------------------------------
>
> Key: CASSANDRA-6142
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6142
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Priority: Minor
> Fix For: 2.1
>
>
> There is at best a very small sweet spot for multithreaded compaction
> (ParallelCompactionIterable). For large rows, we stall the pipeline and fall
> back to a single LCR pass. For small rows, the overhead of the coordination
> outweighs the benefits of parallelization (45s to compact 2x1M stress rows
> with multithreading enabled, vs 35 with it disabled).
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