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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11577) Combine the old and the new chooseRandom for better performance
Date Tue, 28 Mar 2017 17:05:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15945556#comment-15945556
] 

Chen Liang commented on HDFS-11577:
-----------------------------------

Thanks [~linyiqun] for adding the {{LOG.isDebugEnabled}} checking and committing the patch!

> Combine the old and the new chooseRandom for better performance
> ---------------------------------------------------------------
>
>                 Key: HDFS-11577
>                 URL: https://issues.apache.org/jira/browse/HDFS-11577
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>             Fix For: 3.0.0-alpha3
>
>         Attachments: HDFS-11577.001.patch, HDFS-11577.002.patch, HDFS-11577.003.patch
>
>
> As discussed in HDFS-11535, this JIRA adds a new function combining both the new and
the old chooseRandom methods for better performance.
> More specifically, when choosing a random node with storage type requirement, the combined
method first tries the old method of blindly picking a random node. If this node satisfies,
it is returned. Otherwise, the new chooseRandom is called, which guarantees to find a eligible
node in one call (if there is one at all).



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