[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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