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From "Liyin Tang (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5290) [FindBugs] Synchronization on boxed primitive
Date Thu, 26 Jan 2012 22:43:42 GMT
[FindBugs] Synchronization on boxed primitive
---------------------------------------------

                 Key: HBASE-5290
                 URL: https://issues.apache.org/jira/browse/HBASE-5290
             Project: HBase
          Issue Type: Bug
            Reporter: Liyin Tang
            Assignee: Liyin Tang
            Priority: Minor


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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