Tom van der Woerdt created CASSANDRA-12763:
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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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