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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3498) Make ReplicaPlacementPolicyDefault extensible for reuse code in subclass
Date Wed, 20 Jun 2012 19:56:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397819#comment-13397819
] 

Tsz Wo (Nicholas), SZE commented on HDFS-3498:
----------------------------------------------

- If "rack" is good enough in the vm case, let's simply use it so that we don't have to introduce
the new term "LocalityGroup".

- How about rename priSet and remains to moreThanOne and exactlyOne?

> ... There are also some other examples on mis-usage of java container. Shall we address
in this patch or better to put in some separated JIRA? 

Let's do it separately.  Such changes or this patch may break RAID since it also uses BlockPlacementPolicy.
                
> 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.patch, Hadoop-8471-BlockPlacementDefault-extensible.patch
>
>
> ReplicaPlacementPolicy is already a pluggable component in Hadoop. A user specified ReplicaPlacementPolicy
can be specified in the hdfs-site.xml configuration under the key "dfs.block.replicator.classname".
However, to make it possible to reuse code in ReplicaPlacementPolicyDefault a few of its methods
were changed from private to protected. ReplicaPlacementPolicy and BlockPlacementPolicyDefault
are currently annotated with @InterfaceAudience.Private.

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