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https://issues.apache.org/jira/browse/CASSANDRA-12014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15511961#comment-15511961
 ] 

Jeff Jirsa commented on CASSANDRA-12014:
----------------------------------------

At 
https://github.com/stef1927/cassandra/commit/4e3ca613ab17bca7c9c64b1b001abdb65d25ad04#diff-f0a15c3588b56c5ce53ece7c48e325b5R275
 - Any idea of the cost of averaging all partition keys in the memtable? 



> IndexSummary > 2G causes an assertion error
> -------------------------------------------
>
>                 Key: CASSANDRA-12014
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12014
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Brandon Williams
>            Assignee: Stefania
>            Priority: Minor
>             Fix For: 3.0.x, 3.x
>
>
> {noformat}
> ERROR [CompactionExecutor:1546280] 2016-06-01 13:21:00,444  
> CassandraDaemon.java:229 - Exception in thread 
> Thread[CompactionExecutor:1546280,1,main]
> java.lang.AssertionError: null
>     at 
> org.apache.cassandra.io.sstable.IndexSummaryBuilder.maybeAddEntry(IndexSummaryBuilder.java:171)
>  ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> org.apache.cassandra.io.sstable.SSTableWriter$IndexWriter.append(SSTableWriter.java:634)
>  ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> org.apache.cassandra.io.sstable.SSTableWriter.afterAppend(SSTableWriter.java:179)
>  ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> org.apache.cassandra.io.sstable.SSTableWriter.append(SSTableWriter.java:205) 
> ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> org.apache.cassandra.io.sstable.SSTableRewriter.append(SSTableRewriter.java:126)
>  ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:197)
>  ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) 
> ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:73)
>  ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:59)
>  ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:263)
>  ~[cassandra-all-2.1.12.1046.jar:2.1.12.1046]
>     at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) 
> ~[na:1.7.0_51]
>     at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_51]
>     at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>  ~[na:1.7.0_51]
>     at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>  [na:1.7.0_51]
>     at java.lang.Thread.run(Thread.java:744) [na:1.7.0_51]
> {noformat}
> I believe this can be fixed by raising the min_index_interval, but we should 
> have a better method of coping with this than throwing the AE.



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