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https://issues.apache.org/jira/browse/CASSANDRA-11821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290312#comment-16290312
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Jeff Jirsa commented on CASSANDRA-11821:
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[~bperroud] you opened this issue against 2.0.17, which may have been active at
the time, but is EOL'd now. Do you know if this problem still exists in active
versions? If not, I'd like to close it as wont-fix due to it's EOL status.
> nodetool cfhistograms throws java.lang.ArrayIndexOutOfBoundsException and
> reset the cfhistograms
> ------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-11821
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11821
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Environment: 2.0.17, rhel6.4
> Reporter: Benoit Perroud
> Priority: Minor
> Labels: proposed-wontfix
>
> I had nodes running for a decent amount of time (like 3 months).
> {code}
> nodetool cfhistograms keyspace table
> {code}
> did throw and {{ArrayIndexOutOfBoundsException}} in the read latency section:
> {code}
> Read Latency (microseconds)
> Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 90
> at org.apache.cassandra.tools.NodeCmd.printHistogram(NodeCmd.java:1086)
> at
> org.apache.cassandra.tools.NodeCmd.printCfHistograms(NodeCmd.java:1138)
> at org.apache.cassandra.tools.NodeCmd.main(NodeCmd.java:1472)
> {code}
> Surprisingly, the running the same cmd a second time did succeeded, but the
> histograms seem to be reset:
> first call:
> {code}
> SSTables per Read
> 1 sstables: 183026
> 2 sstables: 176538
> 3 sstables: 49159
> 4 sstables: 23034
> 5 sstables: 16380
> ...
> Write Latency (microseconds)
> 3 us: 4
> 4 us: 33
> 5 us: 237
> 6 us: 1193
> 7 us: 4055
> 8 us: 14357
> 10 us: 146728
> 12 us: 565588
> 14 us: 1907616
> 17 us: 8468503
> 20 us: 16218034
> ...
> {code}
> After:
> {code}
> SSTables per Read
> 2 sstables: 52
> 3 sstables: 4
> Write Latency (microseconds)
> 6 us: 1
> 7 us: 3
> 8 us: 5
> 10 us: 53
> 12 us: 133
> 14 us: 379
> 17 us: 1190
> 20 us: 1605
> {code}
> I didn't find anything on the logs, and I wasn't able to have the exception
> popping out more than once per servers.
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