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From "Tom van der Woerdt (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-12763) Compaction performance issues when a table has a lot of sstables
Date Sun, 09 Oct 2016 23:00:26 GMT
Tom van der Woerdt created CASSANDRA-12763:
----------------------------------------------

             Summary: 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


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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