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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1971) HA: Send block report from datanode to both active and standby namenodes
Date Wed, 31 Aug 2011 21:38:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13094925#comment-13094925
] 

Eli Collins commented on HDFS-1971:
-----------------------------------

Doesn't that still have the downside of double-scanning DN disks? Is it worth re-scanning
all DN drives to save 2.5mb?

> 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
>
>
> 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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