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From "Alex Whittaker (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-4218) NPE thrown after switching to LeveledCompactionStrategy
Date Thu, 03 May 2012 21:14:48 GMT
Alex Whittaker created CASSANDRA-4218:

             Summary: NPE thrown after switching to LeveledCompactionStrategy
                 Key: CASSANDRA-4218
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.9, 1.0.5
         Environment: SunOS corbina.local 5.11 joyent_ i86pc i386 i86pc Solaris

            Reporter: Alex Whittaker

After running out of disk space on our six node Cassandra cluster we switched to a Levelled
Compaction Strategy. The servers began to degrade performance accruing a large number of pending
tasks - we noticed that there was a NullPointerException appearing in the system log:

ERROR [CompactionExecutor:22] 2012-05-03 20:34:38,931 (line 139)
Fatal exception in thread Thread[CompactionExecutor:22,1,main]
        at org.apache.cassandra.db.ColumnFamilyStore.getTempSSTablePath(
        at org.apache.cassandra.db.ColumnFamilyStore.getTempSSTablePath(
        at org.apache.cassandra.db.ColumnFamilyStore.createCompactionWriter(
        at org.apache.cassandra.db.compaction.CompactionTask.execute(
        at org.apache.cassandra.db.compaction.LeveledCompactionTask.execute(
        at org.apache.cassandra.db.compaction.CompactionManager$
        at org.apache.cassandra.db.compaction.CompactionManager$
        at java.util.concurrent.FutureTask$Sync.innerRun(
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(
        at java.util.concurrent.ThreadPoolExecutor$

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