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https://issues.apache.org/jira/browse/CASSANDRA-9216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14572828#comment-14572828
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Philip Thompson commented on CASSANDRA-9216:
--------------------------------------------
Have you run into this again? It may just have been a corrupt keycache file.
> NullPointerException (NPE) during Compaction Cache Serialization
> ----------------------------------------------------------------
>
> Key: CASSANDRA-9216
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9216
> Project: Cassandra
> Issue Type: Bug
> Environment: Debian linux wheezy patch current
> Reporter: Jason Kania
> Labels: Compaction, NPE
> Fix For: 2.1.x
>
>
> In case this hasn't been reported (I looked but did not see it), a null
> pointer exception is occurring during compaction. The stack track is as
> follows:
> {code}
> ERROR [CompactionExecutor:50] 2015-04-20 13:42:43,827
> CassandraDaemon.java:223 - Exception in thread
> Thread[CompactionExecutor:50,1,main]
> java.lang.NullPointerException: null
> at
> org.apache.cassandra.service.CacheService$KeyCacheSerializer.serialize(CacheService.java:475)
> ~[apache-cassandra-2.1.4.jar:2.1.4]
> at
> org.apache.cassandra.service.CacheService$KeyCacheSerializer.serialize(CacheService.java:463)
> ~[apache-cassandra-2.1.4.jar:2.1.4]
> at
> org.apache.cassandra.cache.AutoSavingCache$Writer.saveCache(AutoSavingCache.java:274)
> ~[apache-cassandra-2.1.4.jar:2.1.4]
> at
> org.apache.cassandra.db.compaction.CompactionManager$11.run(CompactionManager.java:1152)
> ~[apache-cassandra-2.1.4.jar:2.1.4]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> ~[na:1.7.0_75]
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> ~[na:1.7.0_75]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> ~[na:1.7.0_75]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> [na:1.7.0_75]
> at java.lang.Thread.run(Thread.java:745) [na:1.7.0_75]{code}
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