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Posted to hdfs-issues@hadoop.apache.org by "Arpit Agarwal (JIRA)" <ji...@apache.org> on 2017/08/24 18:20:01 UTC
[jira] [Commented] (HDFS-11577) Combine the old and the new
chooseRandom for better performance
[ https://issues.apache.org/jira/browse/HDFS-11577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16140456#comment-16140456 ]
Arpit Agarwal commented on HDFS-11577:
--------------------------------------
Committed to branch-2. Thanks for the continued work on these backports [~vagarychen].
> 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: 2.9.0, 3.0.0-alpha4
>
> 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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