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https://issues.apache.org/jira/browse/CASSANDRA-14882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16697737#comment-16697737
 ] 

Alex C Punnen commented on CASSANDRA-14882:
-------------------------------------------

After the Cassandra node was restarted this error was not seen

> Exception in Cassandra during Compaction
> ----------------------------------------
>
>                 Key: CASSANDRA-14882
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14882
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Compaction
>         Environment: Cassandra single node 3.11.2 running on Linux  CentOS
>            Reporter: Alex C Punnen
>            Priority: Major
>
> Exception coming in Debug logs every minute. The other information is that 
> the particular table entries were deleted (not sure if by program error or 
> human error) in  a testbed.
> ---------------------------------------
> DEBUG [CompactionExecutor:750] 2018-10-26 21:59:00,512 
> CompactionTask.java:155 - Compacting (583f8a00-d96a-11e8-9c62-3944322fd453) 
> [/var/lib/cassandra/data/xx/xxt_uuid-35106240c6d511e897e559c5a71f3c3c/mc-4-big-Data.db:level=0,
>  ]
> ERROR [CompactionExecutor:750] 2018-10-26 21:59:00,514 
> CassandraDaemon.java:228 - Exception in thread 
> Thread[CompactionExecutor:750,1,main]
> java.lang.NullPointerException: null
> at 
> org.apache.cassandra.config.CFMetaData.enforceStrictLiveness(CFMetaData.java:1266)
>  ~[apache-cassandra-3.11.2.jar:3.11.2]
> at 
> org.apache.cassandra.db.compaction.CompactionIterator$Purger.<init>(CompactionIterator.java:280)
>  ~[apache-cassandra-3.11.2.jar:3.11.2]
> at 
> org.apache.cassandra.db.compaction.CompactionIterator$Purger.<init>(CompactionIterator.java:264)
>  ~[apache-cassandra-3.11.2.jar:3.11.2]
> at 
> org.apache.cassandra.db.compaction.CompactionIterator.<init>(CompactionIterator.java:108)
>  ~[apache-cassandra-3.11.2.jar:3.11.2]
> at 
> org.apache.cassandra.db.compaction.CompactionIterator.<init>(CompactionIterator.java:80)
>  ~[apache-cassandra-3.11.2.jar:3.11.2]
> at 
> org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:177)
>  ~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) 
> ~[apache-cassandra-3.11.2.jar:3.11.2]
> at 
> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:85)
>  ~[apache-cassandra-3.11.2.jar:3.11.2]
> at 
> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:61)
>  ~[apache-cassandra-3.11.2.jar:3.11.2]
> at 
> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:275)
>  ~[apache-cassandra-3.11.2.jar:3.11.2]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
> ~[na:1.8.0_161]
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_161]
> at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  ~[na:1.8.0_161]
> at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  [na:1.8.0_161]
> at 
> org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:81)
>  [apache-cassandra-3.11.2.jar:3.11.2]
> at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_161]



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