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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3456) blockReportInterval is long value but when we take the random value it uses getRandom().nextInt,it is causing frequently BR
Date Wed, 30 May 2012 18:54:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285916#comment-13285916
] 

Tsz Wo (Nicholas), SZE commented on HDFS-3456:
----------------------------------------------

-1 on the patch:
- all use of nextRandomLong are unnecessary;
- there are bugs in nextRandomLong for both HDFS-3456.002.patch and HDFS-3456.003.patch.

                
> blockReportInterval is long value but when we take the random value it uses getRandom().nextInt,it
is causing frequently BR
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3456
>                 URL: https://issues.apache.org/jira/browse/HDFS-3456
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 2.0.0-alpha
>            Reporter: Brahma Reddy Battula
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>         Attachments: HDFS-3456.001.patch, HDFS-3456.002.patch, HDFS-3456.003.patch
>
>
> blockReportInterval is long value but when we take the random value it uses getRandom().nextInt.
> Due to this, offerService can throw exception as long may get rotated to negative value.
> So, block report may send very frequently.
> {code}
>       if (resetBlockReportTime) {
>         lastBlockReport = startTime - DFSUtil.getRandom().nextInt((int)(dnConf.blockReportInterval));
>       resetBlockReportTime = false;
> {code}

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