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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9441) Do not construct path string when choosing block placement targets
Date Wed, 09 Dec 2015 01:09:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15047811#comment-15047811
] 

Tsz Wo Nicholas Sze commented on HDFS-9441:
-------------------------------------------

(Revised description.)

> Do not construct path string when choosing block placement targets
> ------------------------------------------------------------------
>
>                 Key: HDFS-9441
>                 URL: https://issues.apache.org/jira/browse/HDFS-9441
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>            Priority: Minor
>         Attachments: h9441_20151118.patch, h9441_20151119.patch
>
>
> INodeFile.getName() is expensive since it involves quite a few string operations.  The
method is called in both ReplicationWork and ErasureCodingWork but the default BlockPlacementPolicy
does not use the returned string.  We should simply pass BlockCollection to reduce unnecessary
computation when using the default BlockPlacementPolicy.



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