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https://issues.apache.org/jira/browse/HBASE-5290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196370#comment-13196370
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Zhihong Yu commented on HBASE-5290:
-----------------------------------
@Liyin:
Do you mind if I assign this JIRA to Ben ?
> [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)
> Pattern: DL_SYNCHRONIZATION_ON_BOXED_PRIMITIVE
> Type: DL, Category: MT_CORRECTNESS (Multithreaded correctness)
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