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From "Nikolai Grigoriev (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-8190) Compactions stop completely because of RuntimeException in CompactionExecutor
Date Sun, 26 Oct 2014 23:17:33 GMT
Nikolai Grigoriev created CASSANDRA-8190:
--------------------------------------------

             Summary: Compactions stop completely because of RuntimeException in CompactionExecutor
                 Key: CASSANDRA-8190
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8190
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: DSE 4.5.2 (Cassandra 2.0.10)
            Reporter: Nikolai Grigoriev


I have a cluster that is recovering from being overloaded with writes.  I am using the workaround
from CASSANDRA-6621 to prevent the STCS fallback (which is killing the cluster - see CASSANDRA-7949).


I have observed that after one or more exceptions like this

{code}
ERROR [CompactionExecutor:4087] 2014-10-26 22:50:05,016 CassandraDaemon.java (line 199) Exception
in thread Thread[CompactionExecutor:4087,1,main]
java.lang.RuntimeException: Last written key DecoratedKey(425124616570337476, 0010000000001111000000000000033523da00001000000000033523da000000001111000000001000000000
00004000000000000000000100) >= current key DecoratedKey(-8778432288598355336, 0010000000001111000000000000040c7a8f00001000000000040c7a8f000000001111000000001000000000
00004000000000000000000100) writing into /cassandra-data/disk2/myks/mytable/myks-mytable-tmp-jb-130379-Data.db
        at org.apache.cassandra.io.sstable.SSTableWriter.beforeAppend(SSTableWriter.java:142)
        at org.apache.cassandra.io.sstable.SSTableWriter.append(SSTableWriter.java:165)
        at org.apache.cassandra.db.compaction.CompactionTask.runWith(CompactionTask.java:160)
        at org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:48)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
        at org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:60)
        at org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:59)
        at org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionTask.run(CompactionManager.java:198)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
{code}

the node completely stops the compactions and I end up in the state like this:

{code}
# nodetool compactionstats
pending tasks: 1288
          compaction type        keyspace           table       completed           total
     unit  progress
Active compaction remaining time :        n/a
{code}

The node recovers if restarted and starts compactions - until getting more exceptions like
this.




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