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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4040) listSplits fails on IBM JVM
Date Tue, 27 Oct 2015 17:45:27 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14976827#comment-14976827
] 

Josh Elser commented on ACCUMULO-4040:
--------------------------------------

bq. IBM J9 JVM

Do you know the specific version? https://www-01.ibm.com/support/knowledgecenter/SSYKE2_7.0.0/com.ibm.java.lnx.71.doc/user/java_jvm.html
seems to show multiple targeted JREs via different "implementations" of the J9 jvm.

> listSplits fails on IBM JVM
> ---------------------------
>
>                 Key: ACCUMULO-4040
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4040
>             Project: Accumulo
>          Issue Type: Sub-task
>          Components: client
>         Environment: IBM J9 JVM. Accumulo 1.6
>            Reporter: Jared Winick
>             Fix For: 1.8.0
>
>
> I saw a user running on the IBM J9 JVM and the TableOperationsImpl.listSplits  never
returns as it gets stuck in a loop throwing exceptions. It appears like the root cause is
that listSplits calls TableMetadataServicer.getTabletLocations which then calls validateEntries.
In here it attempts to cast a Set to a SortedSet
> {code:java}
> SortedSet<KeyExtent> tabletsKeys = (SortedSet<KeyExtent>) tablets.keySet();
> {code}
> Looks like you can get away with this on a Oracle/OpenJDK JVM as tablets is a TreeMap
and its impl returns a NavigableSet which is a SortedSet.



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