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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1971) HA: Send block report from datanode to both active and standby namenodes
Date Wed, 30 Nov 2011 23:27:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160446#comment-13160446
] 

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

The Hadoop QA bot can't test this out since it's on a branch. But, I think it's best to just
commit so we can move fast on the branch, and we'll make sure that the merge at the end passes
QA and doesn't introduce findbugs, 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
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Suresh Srinivas
>            Assignee: Sanjay Radia
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: DualBlockReports.pdf, daulBr1.patch, dualBr2.patch, dualBr3.patch,
dualBr6.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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