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From "Ravi P Palacherla (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OPENJPA-1970) CPU spinning forever at TreeMap.get in Schema.java
Date Thu, 31 Mar 2011 16:05:05 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-1970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ravi P Palacherla updated OPENJPA-1970:
---------------------------------------

    Description: 
CPU is spinning forever at TreeMap.get in schema.java.
The reason found to be because of structural modification of treemap outside a synchronized
block.
Synchronizing the treemap is fixing the issue.
The issue can be reproduced with an openJPA test case but due to the nature of the problem,
it is replicable intermittently on dual core machine.
Attached patch has the test case and also the test case is ignored in default runs because
it will cause the tests to stuck at TreeMap.get.

This is seen in 1.1.x version of openJPA and hence uploading the patch only for that version.

  was:
CPU is spinning at TreeMap.get in schema.java.
The reason found to be because of structural modification of treemap outside a synchronized
block.
Synchronizing the treemap is fixing the issue.
The issue can be reproduced with an openJPA test case but due to the nature of the problem,
it is replicable intermittently on dual core machine.
Attached patch has the test case and also the test case is ignored in default runs because
it will cause the tests to stuck at TreeMap.get.

This is seen in 1.1.x version of openJPA and hence uploading the patch only for that version.

        Summary: CPU spinning forever at TreeMap.get in Schema.java   (was: CPU spinning at
TreeMap.get in Schema.java )

> CPU spinning forever at TreeMap.get in Schema.java 
> ---------------------------------------------------
>
>                 Key: OPENJPA-1970
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1970
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jdbc
>    Affects Versions: 1.1.1
>         Environment: openJPA 1.1.x
>            Reporter: Ravi P Palacherla
>            Assignee: Ravi P Palacherla
>
> CPU is spinning forever at TreeMap.get in schema.java.
> The reason found to be because of structural modification of treemap outside a synchronized
block.
> Synchronizing the treemap is fixing the issue.
> The issue can be reproduced with an openJPA test case but due to the nature of the problem,
it is replicable intermittently on dual core machine.
> Attached patch has the test case and also the test case is ignored in default runs because
it will cause the tests to stuck at TreeMap.get.
> This is seen in 1.1.x version of openJPA and hence uploading the patch only for that
version.

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