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https://issues.apache.org/jira/browse/CASSANDRA-15669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17353467#comment-17353467
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Yifan Cai commented on CASSANDRA-15669:
---------------------------------------
I am working on committing.
[~azotcsit], can you also provide a patch for the 3.11 branch? We merge from
bottom up. So in this case, it is from 3.11 to trunk. But my preference is to
have patches for each branch, which works better with my committing script :D
> LeveledCompactionStrategy compact last level throw an
> ArrayIndexOutOfBoundsException
> ------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15669
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15669
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Compaction/LCS
> Reporter: sunhaihong
> Assignee: Alexey Zotov
> Priority: Normal
> Fix For: 3.11.x, 4.0.x
>
> Attachments: cfs_compaction_info.png, error_info.png
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Cassandra will throw an ArrayIndexOutOfBoundsException when compact last
> level.
> My test is as follows：
> # Create a table with LeveledCompactionStrategy and its params are
> 'enabled': 'true', 'fanout_size': '2', 'max_threshold': '32',
> 'min_threshold': '4', 'sstable_size_in_mb': '2'（fanout_size and
> sstable_size_in_mb are too small just to make it easier to reproduce the
> problem）;
> # Insert data into the table by stress;
> # Cassandra throw an ArrayIndexOutOfBoundsException when compact level9
> sstables(this level score bigger than 1.001)
> ERROR [CompactionExecutor:4] 2020-03-28 08:59:00,990 CassandraDaemon.java:442
> - Exception in thread Thread[CompactionExecutor:4,1,main]
> java.lang.ArrayIndexOutOfBoundsException: 9
> at
> org.apache.cassandra.db.compaction.LeveledManifest.getLevel(LeveledManifest.java:814)
> at
> org.apache.cassandra.db.compaction.LeveledManifest.getCandidatesFor(LeveledManifest.java:746)
> at
> org.apache.cassandra.db.compaction.LeveledManifest.getCompactionCandidates(LeveledManifest.java:398)
> at
> org.apache.cassandra.db.compaction.LeveledCompactionStrategy.getNextBackgroundTask(LeveledCompactionStrategy.java:131)
> at
> org.apache.cassandra.db.compaction.CompactionStrategyHolder.lambda$getBackgroundTaskSuppliers$0(CompactionStrategyHolder.java:109)
> at
> org.apache.cassandra.db.compaction.AbstractStrategyHolder$TaskSupplier.getTask(AbstractStrategyHolder.java:66)
> at
> org.apache.cassandra.db.compaction.CompactionStrategyManager.getNextBackgroundTask(CompactionStrategyManager.java:214)
> at
> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:289)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
> at java.util.concurrent.FutureTask.run(FutureTask.java)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> at java.lang.Thread.run(Thread.java:748)
> I tested it on cassandra version 3.11.3 & 4.0-alpha3. The exception all
> happened.
> once it triggers, level1- leveln compaction no longer works, level0 is still
> valid
>
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