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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14759) Avoid using Math.abs when selecting SyncRunner in FSHLog
Date Sat, 07 Nov 2015 17:01:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14995290#comment-14995290
] 

Hudson commented on HBASE-14759:
--------------------------------

SUCCESS: Integrated in HBase-1.0 #1109 (See [https://builds.apache.org/job/HBase-1.0/1109/])
HBASE-14759 Avoid using Math.abs when selecting SyncRunner in FSHLog (zhangduo: rev 4456db6848a20c7290aa14dcda6b236ccfd2e8f1)
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestFSHLog.java


> Avoid using Math.abs when selecting SyncRunner in FSHLog
> --------------------------------------------------------
>
>                 Key: HBASE-14759
>                 URL: https://issues.apache.org/jira/browse/HBASE-14759
>             Project: HBase
>          Issue Type: Bug
>          Components: wal
>    Affects Versions: 2.0.0, 1.0.2, 1.2.0, 1.1.2, 1.3.0
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>             Fix For: 2.0.0, 1.2.0, 1.3.0, 1.0.3, 1.1.3
>
>         Attachments: HBASE-14759.patch
>
>
> {code:title=FSHLog.java}
> int index = Math.abs(this.syncRunnerIndex++) % this.syncRunners.length;
>           try {
>             this.syncRunners[index].offer(sequence, this.syncFutures, this.syncFuturesCount);
>           } catch (Exception e) {
>             // Should NEVER get here.
>             requestLogRoll();
>             this.exception = new DamagedWALException("Failed offering sync", e);
>           }
> {code}
> Math.abs will return Integer.MIN_VALUE if you pass Integer.MIN_VALUE in since the actual
absolute value of Integer.MIN_VALUE is out of range.
> I think {{this.syncRunnerIndex++}} will overflow eventually if we keep the regionserver
running for enough time.



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