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https://issues.apache.org/jira/browse/HDFS-12893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16283984#comment-16283984
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Virajith Jalaparti commented on HDFS-12893:
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bq. You are pretty much just copying the storage.
Yes. that was intention -- to ensure that going forward, this is treated as a
regular {{DatanodeStorageInfo}} which has only one {{DatanodeDescriptor}}
associated with it.
I don't think creating a new subtype is required just to replace this. We
already have the {{ProvidedDatanodeStorageInfo}} that is a subclass of
{{DatanodeStorageInfo}} but only one instance of that exists and it is shared
by all {{DatanodeDescriptor}}s that have PROVIDED storage.
> [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,
> HDFS-12893-HDFS-9806.002.patch, HDFS-12893-HDFS-9806.003.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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