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From "Navjyot Nishant (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-8028) Unable to compute when histogram overflowed
Date Sat, 23 Jan 2016 12:35:39 GMT


Navjyot Nishant commented on CASSANDRA-8028:

Hi All,

We are getting similar issue while autocompaction is running on few of our nodes. Following
is the error being logged, can someone please suggest what is causing this and how to resolve
it? We use Cassandra 2.1.9. Please let me know if further information is required.


ERROR [CompactionExecutor:3] 2016-01-23 11:54:50,198 - Exception
in thread Thread[CompactionExecutor:3,1,main]
java.lang.IllegalStateException: Unable to compute ceiling for max when histogram overflowed
        at org.apache.cassandra.utils.EstimatedHistogram.mean(
        at org.apache.cassandra.db.compaction.AbstractCompactionStrategy.worthDroppingTombstones(
        at org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy.getNextBackgroundSSTables(
        at org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy.getNextBackgroundTask(
        at org.apache.cassandra.db.compaction.WrappingCompactionStrategy.getNextBackgroundTask(
        at org.apache.cassandra.db.compaction.CompactionManager$
        at java.util.concurrent.Executors$ ~[na:1.7.0_51]
        at ~[na:1.7.0_51]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(
        at java.util.concurrent.ThreadPoolExecutor$
        at [na:1.7.0_51]

> Unable to compute when histogram overflowed
> -------------------------------------------
>                 Key: CASSANDRA-8028
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>         Environment: Linux
>            Reporter: Gianluca Borello
>            Assignee: Carl Yeksigian
>             Fix For: 2.1.3
>         Attachments: 8028-2.1-clean.txt, 8028-2.1-v2.txt, 8028-2.1.txt, 8028-trunk.txt,
> It seems like with 2.1.0 histograms can't be computed most of the times:
> $ nodetool cfhistograms draios top_files_by_agent1
> nodetool: Unable to compute when histogram overflowed
> See 'nodetool help' or 'nodetool help <command>'.
> I can probably find a way to attach a .cql script to reproduce it, but I suspect it must
be obvious to replicate it as it happens on more than 50% of my column families.

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