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https://issues.apache.org/jira/browse/CASSANDRA-2769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050890#comment-13050890
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Benjamin Coverston commented on CASSANDRA-2769:
-----------------------------------------------
I think Alan has a good point. I don't think it's an appropriate role of the
data tracker to modify the set of sstables to be compacted in a task. It's been
a bit of a struggle to hack around the behavior of the DataTracker to ensure my
compactions happen in the order I want with the SSTables that I want. That
should probably be the exclusive domain compaction strategy.
> Cannot Create Duplicate Compaction Marker
> -----------------------------------------
>
> Key: CASSANDRA-2769
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2769
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 0.8.0
> Reporter: Benjamin Coverston
> Assignee: Sylvain Lebresne
> Fix For: 0.8.2
>
> Attachments:
> 0001-0.8.0-Remove-useless-unmarkCompacting-in-doCleanup.patch,
> 0001-Do-compact-only-smallerSSTables.patch,
> 0002-Only-compact-what-has-been-succesfully-marked-as-com.patch
>
>
> Concurrent compaction can trigger the following exception when two threads
> compact the same sstable. DataTracker attempts to prevent this but apparently
> not successfully.
> java.io.IOError: java.io.IOException: Unable to create compaction marker
> at
> org.apache.cassandra.io.sstable.SSTableReader.markCompacted(SSTableReader.java:638)
> at
> org.apache.cassandra.db.DataTracker.removeOldSSTablesSize(DataTracker.java:321)
> at org.apache.cassandra.db.DataTracker.replace(DataTracker.java:294)
> at
> org.apache.cassandra.db.DataTracker.replaceCompactedSSTables(DataTracker.java:255)
> at
> org.apache.cassandra.db.ColumnFamilyStore.replaceCompactedSSTables(ColumnFamilyStore.java:932)
> at
> org.apache.cassandra.db.compaction.CompactionTask.execute(CompactionTask.java:173)
> at
> org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:119)
> at
> org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:102)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:680)
> Caused by: java.io.IOException: Unable to create compaction marker
> at
> org.apache.cassandra.io.sstable.SSTableReader.markCompacted(SSTableReader.java:634)
> ... 12 more
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