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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8514) ArrayIndexOutOfBoundsException in nodetool cfhistograms
Date Tue, 13 Jan 2015 23:39:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14276206#comment-14276206
] 

Jonathan Ellis commented on CASSANDRA-8514:
-------------------------------------------

It looks to me like the cause is this:

{code}
    private static long[] combineHistograms(Iterable<SSTableReader> sstables, GetHistogram
getHistogram)
    {
        Iterator<SSTableReader> iterator = sstables.iterator();
        if (!iterator.hasNext())
        {
            return new long[0];
        }
{code}

... which really isn't a valid histogram bucket array.  So rather than hacking histogram to
try to turn nonsense back into a histogram, would it make more sense to return null and deal
with that correctly in nodetool?

/cc [~carlyeks]

> ArrayIndexOutOfBoundsException in nodetool cfhistograms
> -------------------------------------------------------
>
>                 Key: CASSANDRA-8514
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8514
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>         Environment: OSX
>            Reporter: Philip Thompson
>             Fix For: 2.1.3
>
>         Attachments: cassandra-2.1-8514-1.txt
>
>
> When running nodetool cfhistograms on 2.1-HEAD, I am seeing the following exception:
> {code}
> 04:02 PM:~/cstar/cassandra[cassandra-2.1*]$ bin/nodetool cfhistograms keyspace1 standard1
> objc[58738]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.7.0_67.jdk/Contents/Home/bin/java
and /Library/Java/JavaVirtualMachines/jdk1.7.0_67.jdk/Contents/Home/jre/lib/libinstrument.dylib.
One of the two will be used. Which one is undefined.
> error: 0
> -- StackTrace --
> java.lang.ArrayIndexOutOfBoundsException: 0
> 	at org.apache.cassandra.utils.EstimatedHistogram.newOffsets(EstimatedHistogram.java:75)
> 	at org.apache.cassandra.utils.EstimatedHistogram.<init>(EstimatedHistogram.java:60)
> 	at org.apache.cassandra.tools.NodeTool$CfHistograms.execute(NodeTool.java:946)
> 	at org.apache.cassandra.tools.NodeTool$NodeToolCmd.run(NodeTool.java:250)
> 	at org.apache.cassandra.tools.NodeTool.main(NodeTool.java:164){code}
> I can reproduce this with these simple steps:
> Start a new C* 2.1-HEAD node
> Run {{cassandra-stress write n=10000}}
> Run {{nodetool cfhistograms keyspace1 standard1}}



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