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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1593) Allow a datanode to copy a block to a datanode on a foreign HDFS cluster.
Date Mon, 24 Jan 2011 18:10:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12985858#action_12985858
] 

Todd Lipcon commented on HDFS-1593:
-----------------------------------

I think for this to work correctly with security, the RPC needs to also include an AccessToken
for the destination cluster, and that needs to be passed into the DataTransfer thread. As
is, the accessToken generated is only valid on the source cluster, so the write will be denied
on the destination.

> Allow a datanode to copy a block to a datanode on a foreign HDFS cluster.
> -------------------------------------------------------------------------
>
>                 Key: HDFS-1593
>                 URL: https://issues.apache.org/jira/browse/HDFS-1593
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: copyBlockTrunk1.txt
>
>
> This patch introduces an RPC to the datanode to allow it to copy a block to a datanode
on a remote HDFS cluster.

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