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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5290) [FindBugs] Synchronization on boxed primitive
Date Mon, 30 Jan 2012 19:53:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196372#comment-13196372

Hadoop QA commented on HBASE-5290:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 javadoc.  The javadoc tool appears to have generated -140 warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 158 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

     -1 core tests.  The patch failed these unit tests:

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/873//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/873//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/873//console

This message is automatically generated.
> [FindBugs] Synchronization on boxed primitive
> ---------------------------------------------
>                 Key: HBASE-5290
>                 URL: https://issues.apache.org/jira/browse/HBASE-5290
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.0
>            Reporter: Liyin Tang
>            Assignee: Liyin Tang
>            Priority: Minor
>         Attachments: HBASE-5290.patch, HBASE-5290.patch, HBASE-5290v2.patch
> This bug is reported by the findBugs tool, which is a static analysis tool.
> Bug: Synchronization on Integer in org.apache.hadoop.hbase.regionserver.compactions.CompactSelection.emptyFileList()
> The code synchronizes on a boxed primitive constant, such as an Integer.
> private static Integer count = 0;
> ...
>   synchronized(count) {
>      count++;
>      }
> ...
> Since Integer objects can be cached and shared, this code could be synchronizing on the
same object as other, unrelated code, leading to unresponsiveness and possible deadlock
> See CERT CON08-J. Do not synchronize on objects that may be reused for more information.
> Confidence: Normal, Rank: Troubling (14)
> Type: DL, Category: MT_CORRECTNESS (Multithreaded correctness)

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