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From "Mike Drob (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11537) Avoid synchronization on instances of ConcurrentMap
Date Thu, 17 Jul 2014 19:53:05 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Mike Drob updated HBASE-11537:

    Attachment: HBASE-11537.patch.txt

This patch swaps out the use of synchronization on a {{ConcurrentMap}} with calls to {{putIfAbsent}}
and the conditional {{remove}}.

We also remove a dead store of the result of {{pool.submit()}} since we return from the method
immediately. And remove the unreachable null check in the catch block because if something
threw an exception then it's not possible for the given {{Future}} to have been assigned.

I'm not sure how to write additional tests for this, but the existing tests pass for me. Would
love to hear feedback.

> Avoid synchronization on instances of ConcurrentMap
> ---------------------------------------------------
>                 Key: HBASE-11537
>                 URL: https://issues.apache.org/jira/browse/HBASE-11537
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Mike Drob
>            Assignee: Mike Drob
>            Priority: Minor
>              Labels: findbugs
>         Attachments: HBASE-11537.patch.txt
> In {{ProcedureCoordinator}} and {{ProcedureMember}} we synchronize on an instance of
{{ConcurrentMap}} instead of using the interface methods for dealing with concurrent access.

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