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