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From Íñigo Goiri (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HDFS-12893) [READ] Support replication of Provided blocks with non-default topologies.
Date Wed, 06 Dec 2017 00:03:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16279405#comment-16279405
] 

Íñigo Goiri commented on HDFS-12893:
------------------------------------

Thanks [~virajith], I would change {{ProvidedStorageMap#getDatanodeDescriptor()}} to something
a little more descriptive and move out the logic to check the regular DN case.
I would also include a javadoc there.

> [READ] Support replication of Provided blocks with non-default topologies.
> --------------------------------------------------------------------------
>
>                 Key: HDFS-12893
>                 URL: https://issues.apache.org/jira/browse/HDFS-12893
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Virajith Jalaparti
>            Assignee: Virajith Jalaparti
>         Attachments: HDFS-12893-HDFS-9806.001.patch
>
>
> {{chooseSourceDatanodes}} returns the {{ProvidedDatanodeDescriptor}} as the source of
Provided blocks. As this isn't a physical datanode and doesn't exist the topology, {{ReplicationWork.chooseTargets}}
might fail depending on the chosen {{BlockPlacementPolicy}} implementation. This JIRA aims
to fix this issue.



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