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https://issues.apache.org/jira/browse/CASSANDRA-15324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928322#comment-16928322
 ] 

Dinesh Joshi commented on CASSANDRA-15324:
------------------------------------------

Your issue is likely related to your data model. Its better to discuss it on 
the [user mailing list|http://cassandra.apache.org/community/].

> Unable to compute ceiling for max when histogram
> ------------------------------------------------
>
>                 Key: CASSANDRA-15324
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15324
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Compaction, Local/Compaction/STCS
>            Reporter: HsuML
>            Priority: Normal
>
> I have 9 cassandra nodes. When I create a keyspace that has 15 tables and the 
> record count of all table are about 8.2 billion. I imported data through my 
> java loaders, and I found out the system.log has error message. What happened 
> and how can I solve the error?
> Exception in thread Thread[CompactionExecutor:113041,1,main] 
> java.lang.IllegalStateException: Unable to compute ceiling for max when 
> histogram overflowed
>       at 
> org.apache.cassandra.utils.EstimatedHistogram.rawMean(EstimatedHistogram.java:231)
>  ~[apache-cassandra-3.11.4.jar:3.11.4]
>       at 
> org.apache.cassandra.utils.EstimatedHistogram.mean(EstimatedHistogram.java:220)
>  ~[apache-cassandra-3.11.4.jar:3.11.4]
>       at 
> org.apache.cassandra.io.sstable.metadata.StatsMetadata.getEstimatedDroppableTombstoneRatio(StatsMetadata.java:115)
>  ~[apache-cassandra-3.11.4.jar:3.11.4]
>       at 
> org.apache.cassandra.io.sstable.format.SSTableReader.getEstimatedDroppableTombstoneRatio(SSTableReader.java:1926)
>  ~[apache-cassandra-3.11.4.jar:3.11.4]
>       at 
> org.apache.cassandra.db.compaction.AbstractCompactionStrategy.worthDroppingTombstones(AbstractCompactionStrategy.java:424)
>  ~[apache-cassandra-3.11.4.jar:3.11.4]
>       at 
> org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy.getNextBackgroundSSTables(SizeTieredCompactionStrategy.java:99)
>  ~[apache-cassandra-3.11.4.jar:3.11.4]
>       at 
> org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy.getNextBackgroundTask(SizeTieredCompactionStrategy.java:183)
>  ~[apache-cassandra-3.11.4.jar:3.11.4]
>       at 
> org.apache.cassandra.db.compaction.CompactionStrategyManager.getNextBackgroundTask(CompactionStrategyManager.java:153)
>  ~[apache-cassandra-3.11.4.jar:3.11.4]
>       at 
> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:260)
>  ~[apache-cassandra-3.11.4.jar:3.11.4]
>       at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
> ~[na:1.8.0_191]
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
> ~[na:1.8.0_191]
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  ~[na:1.8.0_191]
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  [na:1.8.0_191]
>       at 
> org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:81)
>  [apache-cassandra-3.11.4.jar:3.11.4]
>       at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_191]



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