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https://issues.apache.org/jira/browse/HDFS-15120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17051825#comment-17051825
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Ayush Saxena commented on HDFS-15120:
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Hi [~LiJinglun]
Observed one problem here, this fix will work if we want to change the value
back to default. but not a new one. since you are not setting the new value in
the conf.
In the test also we just tested from MockBPP to DefaultBPP. and this works.
But I think the reverse won't work.
Give a check once
> Refresh BlockPlacementPolicy at runtime.
> ----------------------------------------
>
> Key: HDFS-15120
> URL: https://issues.apache.org/jira/browse/HDFS-15120
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Jinglun
> Assignee: Jinglun
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HDFS-15120.001.patch, HDFS-15120.002.patch,
> HDFS-15120.003.patch, HDFS-15120.004.patch, HDFS-15120.005.patch,
> HDFS-15120.006.patch, HDFS-15120.007.1.patch, HDFS-15120.007.patch,
> HDFS-15120.008.patch
>
>
> Now if we want to switch BlockPlacementPolicies we need to restart the
> NameNode. It would be convenient if we can switch it at runtime. For example
> we can switch between AvailableSpaceBlockPlacementPolicy and
> BlockPlacementPolicyDefault as needed.
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