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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 22:17:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196476#comment-13196476

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 doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    -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 157 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/876//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/876//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/876//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: 5290-v3.txt, 5290-v4.txt, 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.
> {code}
> private static Integer count = 0;
> ...
>   synchronized(count) {
>      count++;
>      }
> ...
> {code}
> 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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