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From "Marshall Schor (JIRA)" <...@uima.apache.org>
Subject [jira] [Commented] (UIMA-2515) Need better workaround for intermittent out-of-stack in Arrays.sort for compressed binary serialization
Date Thu, 06 Dec 2012 14:23:09 GMT

    [ https://issues.apache.org/jira/browse/UIMA-2515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13511408#comment-13511408
] 

Marshall Schor commented on UIMA-2515:
--------------------------------------

I tracked this down by experimentation to an apparent JIT compilation problem.  I found a
viable workaround was to increase the retry count to 20 from 2, and I dropped the array reverse
operation - since it's not really related to the order of elements.  My test case did the
first 1 or 2 Arrays.sort operations without error, then the Jit (#1) kicked in, and it got
out-of-stack for the next instance.  After retrying this sort call 5 times, it started working
(I'm guessing that JIT (#2) was done), and never failed after that.

I've opened a problem report against this version of Java.  (As of version 7, Java changed
its sort algorithm, and that other algorithm doesn't seem to suffer from this issue.)
                
> Need better workaround for intermittent out-of-stack in Arrays.sort for compressed binary
serialization
> -------------------------------------------------------------------------------------------------------
>
>                 Key: UIMA-2515
>                 URL: https://issues.apache.org/jira/browse/UIMA-2515
>             Project: UIMA
>          Issue Type: Bug
>          Components: Core Java Framework
>    Affects Versions: 2.4.0SDK
>         Environment: Windows, Linux, IBM Java 5 and 6 (not 7, not Sun/Oracle)
>            Reporter: Marshall Schor
>            Assignee: Marshall Schor
>             Fix For: 2.4.1SDK
>
>
> On IBM Java 6, there is an occasional failure in Arrays.sort used to sort the strings
in the heap.  The failure is an out-of-stack-space error.  It is very intermittent.  I had
earlier seen this, and had wrapped the call to Arrays.sort in a try/catch loop which caught
the out-of-stack-space.  The code would retry this once, after reversing the array (thinking
this would change things to avoid the out-of-memory).  In further extensive use, this error
has popped up again, even with this retry.  Need a better workaround.

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