graham sanderson created CASSANDRA-6483:
-------------------------------------------
Summary: Possible Collections.sort assertion failure in
STCS.filterColdSSTables
Key: CASSANDRA-6483
URL: https://issues.apache.org/jira/browse/CASSANDRA-6483
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: graham sanderson
We have observed the following stack trace periodically:
{code}
java.lang.IllegalArgumentException: Comparison method violates its general
contract!
at java.util.TimSort.mergeLo(TimSort.java:747)
at java.util.TimSort.mergeAt(TimSort.java:483)
at java.util.TimSort.mergeCollapse(TimSort.java:410)
at java.util.TimSort.sort(TimSort.java:214)
at java.util.TimSort.sort(TimSort.java:173)
at java.util.Arrays.sort(Arrays.java:659)
at java.util.Collections.sort(Collections.java:217)
at
org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy.filterColdSSTables(SizeTieredCompactionStrategy.java:94)
at
org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy.getNextBackgroundSSTables(SizeTieredCompactionStrategy.java:59)
at
org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy.getNextBackgroundTask(SizeTieredCompactionStrategy.java:229)
at
org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionTask.run(CompactionManager.java:191)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
{code}
The comparator ant SizeTieredCompactionStrategy line 94 breaks the assertions
in the new JDK7 default sort algorithm, because (I think just) the hotness
value (based on meter) may be modified concurrently by another thread
This bug appears to have been introduced in CASSANDRA-6109
--
This message was sent by Atlassian JIRA
(v6.1.4#6159)
