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Posted to hdfs-issues@hadoop.apache.org by "Eric Payne (JIRA)" <ji...@apache.org> on 2014/10/08 23:51:35 UTC

[jira] [Commented] (HDFS-7213) processIncrementalBlockReport performance degradation

    [ https://issues.apache.org/jira/browse/HDFS-7213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14164237#comment-14164237 ] 

Eric Payne commented on HDFS-7213:
----------------------------------

[~daryn], would you mind taking a look at this patch? Thanks.

> processIncrementalBlockReport performance degradation
> -----------------------------------------------------
>
>                 Key: HDFS-7213
>                 URL: https://issues.apache.org/jira/browse/HDFS-7213
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.4.0
>            Reporter: Daryn Sharp
>            Assignee: Eric Payne
>            Priority: Critical
>         Attachments: HDFS-7213.1412804753
>
>
> {{BlockManager#processIncrementalBlockReport}} has a debug line that is missing a {{isDebugEnabled}} check.  The write lock is being held.  Coupled with the increase in incremental block reports from receiving blocks, under heavy load this log line noticeably degrades performance.



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