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https://issues.apache.org/jira/browse/HDFS-3498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13400322#comment-13400322
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Junping Du commented on HDFS-3498:
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I took a look at the log of javadoc testing:
https://builds.apache.org/job/PreCommit-HDFS-Build/2693/artifact/trunk/patchprocess/patchJavadocWarnings.txt
and it looks like 13 java warnings are all in hadoop-hdfs-raid. Is there
anything I should fix in this patch?
> Make ReplicaPlacementPolicyDefault extensible for reuse code in subclass
> ------------------------------------------------------------------------
>
> Key: HDFS-3498
> URL: https://issues.apache.org/jira/browse/HDFS-3498
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Junping Du
> Assignee: Junping Du
> Attachments: HDFS-3498-v2.patch, HDFS-3498-v3.patch,
> HDFS-3498-v4.patch, HDFS-3498.patch,
> Hadoop-8471-BlockPlacementDefault-extensible.patch
>
>
> ReplicaPlacementPolicy is already a pluggable component in Hadoop. However,
> the Replica Removal Policy is still nested in BlockManager that need to be
> separated out into a ReplicaPlacementPolicy then can be override later. Also
> it looks like hadoop unit test lack the testing on replica removal policy, so
> we add it here.
> On the other hand, as a implementation of ReplicaPlacementPolicy,
> ReplicaPlacementDefault still show lots of generic for other topology cases
> like: virtualization, and we want to make code in
> ReplicaPlacementPolicyDefault can be reused as much as possible so a few of
> its methods were changed from private to protected.
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