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Date: Tue, 29 Nov 2011 22:31:41 +0000 (UTC)
From: "Todd Lipcon (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-1971) HA: Send block report from datanode
 to both active and standby namenodes
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    [ https://issues.apache.org/jira/browse/HDFS-1971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159589#comment-13159589 ] 

Todd Lipcon commented on HDFS-1971:
-----------------------------------

I'll file a separate JIRA for #1 above.

Let me look into why I made that change with regard to #2

Regarding #3, the reasoning was that we used to grab references to a specific DatanodeProtocol proxy in BlockReceiver#verifyChunks. Now, we need to report that bad block to both NNs. So, it made more sense to add this new method to DataNode to pass the bad block info through to the correct BPOS, matching what we do for blockReceived, etc.
                
> HA: Send block report from datanode to both active and standby namenodes
> ------------------------------------------------------------------------
>
>                 Key: HDFS-1971
>                 URL: https://issues.apache.org/jira/browse/HDFS-1971
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, name-node
>            Reporter: Suresh Srinivas
>            Assignee: Sanjay Radia
>         Attachments: DualBlockReports.pdf, daulBr1.patch, dualBr2.patch, dualBr3.patch, dualbr4.txt, dualbr5.txt
>
>
> To enable hot standby namenode, the standby node must have current information for - namenode state (image + edits) and block location information. This jira addresses keeping the block location information current in the standby node. To do this, the proposed solution is to send block reports from the datanodes to both the active and the standby namenode.

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