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https://issues.apache.org/jira/browse/CASSANDRA-8034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yuki Morishita updated CASSANDRA-8034:
--------------------------------------
Reviewer: Yuki Morishita
> AssertionError when STOP:ing compactions
> ----------------------------------------
>
> Key: CASSANDRA-8034
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8034
> Project: Cassandra
> Issue Type: Bug
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Fix For: 2.1.1
>
> Attachments: 0001-notify-whenever-we-replace-a-reader.patch
>
>
> When we open compaction results early we clone the SSTableReader (ie create a
> new instance of it). Any compaction strategy that keeps track of its sstables
> will not be notified of that new sstable and keeps a reference to the old
> instance. The compaction strategy gets notified when the compaction is
> actually done.
> The problem is if the compaction is interrupted, then LCS will start a new
> compaction with those stale SSTableReader instances and trigger an assertion
> error:
> {code}
> ERROR 14:27:06 Exception in thread Thread[CompactionExecutor:3,1,main]
> java.lang.AssertionError: Reference counter -1 for
> /var/lib/cassandra/data/Keyspace1/Standard1-0bf25ed0496711e4bf3f07871b385ea9/Keyspace1-Standard1-ka-15-Data.db
> at
> org.apache.cassandra.io.sstable.SSTableReader.releaseReference(SSTableReader.java:1601)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.db.DataTracker.replaceReaders(DataTracker.java:375)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.io.sstable.SSTableRewriter.replaceReaders(SSTableRewriter.java:284)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.io.sstable.SSTableRewriter.moveStarts(SSTableRewriter.java:250)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.io.sstable.SSTableRewriter.switchWriter(SSTableRewriter.java:298)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.db.compaction.CompactionTask.runWith(CompactionTask.java:187)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:48)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:75)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:59)
> ~[Cassandra/:na]
> at
> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionTask.run(CompactionManager.java:236)
> ~[Cassandra/:na]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> ~[na:1.7.0_67]
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> ~[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]
> {code}
> Fix is probably to tell the compaction strategy that there is a new sstable
> instance whenever we create one.
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