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https://issues.apache.org/jira/browse/CASSANDRA-12763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Stefania updated CASSANDRA-12763:
---------------------------------
    Status: Ready to Commit  (was: Patch Available)

> Compaction performance issues when a table has a lot of sstables
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-12763
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12763
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Compaction
>            Reporter: Tom van der Woerdt
>            Assignee: Marcus Eriksson
>            Priority: Major
>             Fix For: 3.0.x, 3.11.x, 4.x
>
>
> An issue with a script flooded my cluster with sstables. There is now a table 
> with 100k sstables, all on the order of KBytes, and it's taking a long time 
> (ETA 20 days) to compact, even though the table is only ~30GB.
> Stack trace :
> {noformat}
> "CompactionExecutor:269" #7536 daemon prio=1 os_prio=4 tid=0x00007f4acd40fc00 
> nid=0x14f8 runnable [0x00007f4798436000]
>    java.lang.Thread.State: RUNNABLE
>       at java.io.UnixFileSystem.list(Native Method)
>       at java.io.File.list(File.java:1122)
>       at java.io.File.listFiles(File.java:1248)
>       at 
> org.apache.cassandra.db.lifecycle.LogRecord.getExistingFiles(LogRecord.java:268)
>       at org.apache.cassandra.db.lifecycle.LogRecord.make(LogRecord.java:150)
>       at 
> org.apache.cassandra.db.lifecycle.LogFile.makeRecord(LogFile.java:293)
>       at org.apache.cassandra.db.lifecycle.LogFile.add(LogFile.java:283)
>       at 
> org.apache.cassandra.db.lifecycle.LogTransaction.obsoleted(LogTransaction.java:158)
>       at 
> org.apache.cassandra.db.lifecycle.Helpers.prepareForObsoletion(Helpers.java:134)
>       at 
> org.apache.cassandra.db.lifecycle.LifecycleTransaction.doPrepare(LifecycleTransaction.java:193)
>       at 
> org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.prepareToCommit(Transactional.java:173)
>       at 
> org.apache.cassandra.io.sstable.SSTableRewriter.doPrepare(SSTableRewriter.java:376)
>       at 
> org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.prepareToCommit(Transactional.java:173)
>       at 
> org.apache.cassandra.db.compaction.writers.CompactionAwareWriter.doPrepare(CompactionAwareWriter.java:84)
>       at 
> org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.prepareToCommit(Transactional.java:173)
>       at 
> org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.finish(Transactional.java:184)
>       at 
> org.apache.cassandra.db.compaction.writers.CompactionAwareWriter.finish(CompactionAwareWriter.java:94)
>       at 
> org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:194)
>       at 
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
>       at 
> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:78)
>       at 
> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:61)
>       at 
> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:263)
>       at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> {noformat}
> listFiles is being called over and over, apparently scaling with the number 
> of files in the compaction.



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