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Date: Mon, 28 Nov 2011 02:38:41 +0000 (UTC)
From: "Todd Lipcon (Updated) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (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:all-tabpanel ]

Todd Lipcon updated HDFS-1971:
------------------------------

    Attachment: dualbr5.txt

This patch just has a few small cleanups from dualbr4.patch.

It still leaves the refreshNamenodes bit TODO, and adds a few more TODOs where we have to sort out what to do in terms of HA. I think it's worth committing this now, even with the TODOs, so we can address the TODOs in parallel. It will unblock other work and allow us to start figuring out more subtle issues.

I can file follow-up JIRAs for each of the TODOs when this is committed.

I've been testing this patch on top of HDFS-2582 and HDFS-2591 in that order, though I think it only strictly depends on HDFS-2582
                
> 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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