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https://issues.apache.org/jira/browse/CASSANDRA-10260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14736855#comment-14736855
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Paulo Motta commented on CASSANDRA-10260:
-----------------------------------------

This issue was fixed  in 2.1.8 by CASSANDRA-9656.

bq. The key cache was not being setup for all readers

> NPE in SSTableReader.invalidateCacheKey
> ---------------------------------------
>
>                 Key: CASSANDRA-10260
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10260
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: 2.1.7
>            Reporter: Jeff Jirsa
>            Assignee: Paulo Motta
>             Fix For: 2.1.8
>
>
> {code}
> ERROR [NonPeriodicTasks:1] 2015-09-03 05:24:51,056 CassandraDaemon.java:223 - 
> Exception in thread Thread[NonPeriodicTasks:1,5,main]
> java.lang.NullPointerException: null
>         at 
> org.apache.cassandra.io.sstable.SSTableReader.invalidateCacheKey(SSTableReader.java:1445)
>  ~[apache-cassandra-2.1.7.jar:2.1.7]
>         at 
> org.apache.cassandra.io.sstable.SSTableRewriter$1.run(SSTableRewriter.java:323)
>  ~[apache-cassandra-2.1.7.jar:2.1.7]
>         at 
> org.apache.cassandra.io.sstable.SSTableReader$5.run(SSTableReader.java:1024) 
> ~[apache-cassandra-2.1.7.jar:2.1.7]
>         at 
> org.apache.cassandra.io.sstable.SSTableReader$InstanceTidier$1.run(SSTableReader.java:2146)
>  ~[apache-cassandra-2.1.7.jar:2.1.7]
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
> ~[na:1.8.0_51]
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
> ~[na:1.8.0_51]
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
>  ~[na:1.8.0_51]
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
>  ~[na:1.8.0_51]
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>  ~[na:1.8.0_51]
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>  [na:1.8.0_51]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_51]
> {code}
> Seen in 2.1.7 in a node running cleanup. May be fixed already, logging to be 
> safe. 



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