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https://issues.apache.org/jira/browse/CASSANDRA-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267855#comment-13267855
]
Jonathan Ellis commented on CASSANDRA-4218:
-------------------------------------------
enabling debug logging on org.apache.cassandra.config.DatabaseDescriptor would
show if that last is the problem
> NPE thrown after switching to LeveledCompactionStrategy
> -------------------------------------------------------
>
> Key: CASSANDRA-4218
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4218
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.5, 1.0.9
> 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
> AbstractCassandraDaemon.java (line 139) Fatal exception in thread
> Thread[CompactionExecutor:22,1,main]
> java.lang.NullPointerException
> at java.io.File.<init>(File.java:222)
> at
> org.apache.cassandra.db.ColumnFamilyStore.getTempSSTablePath(ColumnFamilyStore.java:642)
> at
> org.apache.cassandra.db.ColumnFamilyStore.getTempSSTablePath(ColumnFamilyStore.java:653)
> at
> org.apache.cassandra.db.ColumnFamilyStore.createCompactionWriter(ColumnFamilyStore.java:1892)
> at
> org.apache.cassandra.db.compaction.CompactionTask.execute(CompactionTask.java:153)
> at
> org.apache.cassandra.db.compaction.LeveledCompactionTask.execute(LeveledCompactionTask.java:57)
> at
> org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:135)
> at
> org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:115)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
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