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From "Gianluca Borello (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8028) Unable to compute when histogram overflowed
Date Thu, 02 Oct 2014 16:48:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14156737#comment-14156737
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Gianluca Borello commented on CASSANDRA-8028:
---------------------------------------------

How "large" partitions are we talking about here?

The worrisome thing is that the command fails on a column family, and then, a few seconds
later, it works, again on that same column family:

First attempt:

$ nodetool cfhistograms draios protobuf1
nodetool: Unable to compute when histogram overflowed
See 'nodetool help' or 'nodetool help <command>'.

Second attempt (after about 30 seconds):

$ nodetool cfhistograms draios protobuf1
draios/protobuf1 histograms
Percentile  SSTables     Write Latency      Read Latency    Partition Size        Cell Count
                              (micros)          (micros)           (bytes)
50%             0.00             18.60            159.55           1955666              1597
75%             1.00             21.77            364.55           4055269              3973
95%             1.00             33.11          10789.18           7007506             61214
98%             3.00             53.04          56822.90           8409007             61214
99%             4.00            155.01          77205.61           8409007             61214
Min             0.00              7.11             58.23            105779               
87
Max             5.00          85449.58         189451.45          17436917             61214

There were no deletions in between, and the partitions don't seem that big to me, we try to
keep them always under a few MBs.

> Unable to compute when histogram overflowed
> -------------------------------------------
>
>                 Key: CASSANDRA-8028
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8028
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>         Environment: Linux
>            Reporter: Gianluca Borello
>            Assignee: Carl Yeksigian
>             Fix For: 2.1.1
>
>         Attachments: 8028-2.1.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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