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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11577) Combine the old and the new chooseRandom for better performance
Date Fri, 24 Mar 2017 21:30:41 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11577?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Chen Liang updated HDFS-11577:
    Status: Patch Available  (was: In Progress)

> 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
>         Attachments: HDFS-11577.001.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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