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https://issues.apache.org/jira/browse/HDFS-11482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898412#comment-15898412
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Chen Liang commented on HDFS-11482:
-----------------------------------
I was looking into what would happen when chooseRandom and add/remove are being
called simultaneously. I'm inclined to believe that as long as the
{{DFSNetworkTopology}} object is synchronized by the caller when calling
chooseRandom and add/remove, there should be no problem. But any comments are
more than welcome.
> Add storage type demand to into DFSNetworkTopology#chooseRandom
> ---------------------------------------------------------------
>
> Key: HDFS-11482
> URL: https://issues.apache.org/jira/browse/HDFS-11482
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Chen Liang
> Assignee: Chen Liang
> Attachments: HDFS-11482.001.patch, HDFS-11482.002.patch
>
>
> HDFS-11450 adds storage type info into network topology, with on this info we
> may change chooseRandom to take storage type requirement as parameter, only
> checking subtrees required storage type available. This way we avoid blindly
> picking up nodes that are not applicable.
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