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https://issues.apache.org/jira/browse/CASSANDRA-8182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14182523#comment-14182523
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Sylvain Lebresne commented on CASSANDRA-8182:
---------------------------------------------
Looks like this come from CASSANDRA-5519. I suspect the problem is that the
comparison function uses the SSTableReader {{readMeter.fifteenMinuteRate()}},
but if you're unlucky this value can change in the middle of the sorting (thus
changing the comparison value for 2 sstables in the middle of the sorting). We
probably should save those rate in a map or something before the sort and have
the sorting refer to those saved and stable values.
> Comparison method violates its general contract in
> IndexSummaryManager.redistributeSummaries
> --------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-8182
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8182
> Project: Cassandra
> Issue Type: Bug
> Environment: 2.1.0
> Reporter: Juho Mäkinen
> Assignee: Tyler Hobbs
>
> I found this exception while going over the logs of my new 2.1.0 production
> candidate cluster:
> ERROR [IndexSummaryManager:1] 2014-10-23 14:37:56,727
> CassandraDaemon.java:166 - Exception in thread
> Thread[IndexSummaryManager:1,1,main]
> java.lang.IllegalArgumentException: Comparison method violates its general
> contract!
> at java.util.TimSort.mergeLo(TimSort.java:747) ~[na:1.7.0_67]
> at java.util.TimSort.mergeAt(TimSort.java:483) ~[na:1.7.0_67]
> at java.util.TimSort.mergeCollapse(TimSort.java:408) ~[na:1.7.0_67]
> at java.util.TimSort.sort(TimSort.java:214) ~[na:1.7.0_67]
> at java.util.TimSort.sort(TimSort.java:173) ~[na:1.7.0_67]
> at java.util.Arrays.sort(Arrays.java:659) ~[na:1.7.0_67]
> at java.util.Collections.sort(Collections.java:217) ~[na:1.7.0_67]
> at
> org.apache.cassandra.io.sstable.IndexSummaryManager.redistributeSummaries(IndexSummaryManager.java:277)
> ~[apache-cassandra-2.1.0.jar:2.1.0]
> at
> org.apache.cassandra.io.sstable.IndexSummaryManager.redistributeSummaries(IndexSummaryManager.java:238)
> ~[apache-cassandra-2.1.0.jar:2.1.0]
> at
> org.apache.cassandra.io.sstable.IndexSummaryManager$1.runMayThrow(IndexSummaryManager.java:139)
> ~[apache-cassandra-2.1.0.jar:2.1.0]
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> ~[apache-cassandra-2.1.0.jar:2.1.0]
> at
> org.apache.cassandra.concurrent.DebuggableScheduledThreadPoolExecutor$UncomplainingRunnable.run(DebuggableScheduledThreadPoolExecutor.java:75)
> ~[apache-cassandra-2.1.0.jar:2.1.0]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> [na:1.7.0_67]
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
> [na:1.7.0_67]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
> [na:1.7.0_67]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> [na:1.7.0_67]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> [na:1.7.0_67]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> [na:1.7.0_67]
> at java.lang.Thread.run(Thread.java:745) [na:1.7.0_67]
> There's some other cases of invalid comparison methods in the past, but not
> from this case.
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