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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1975) HA: Support for sharing the namenode state from active to standby.
Date Thu, 04 Aug 2011 07:11:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13079257#comment-13079257
] 

Aaron T. Myers commented on HDFS-1975:
--------------------------------------

Looks like a pretty good first draft, Todd. Since this isn't intended for commit, I didn't
review it for style. One question:

Given that the {{lagLenth}} is set to 1000, will there be a problem if an {{FSEditLogOp}}
is serialized to more than 1000 bytes? Or if an EOF is encountered in the middle of a serialized
op? I suspect some exception might get thrown in this case which would cause the tailer to
fail.

> HA: Support for sharing the namenode state from active to standby.
> ------------------------------------------------------------------
>
>                 Key: HDFS-1975
>                 URL: https://issues.apache.org/jira/browse/HDFS-1975
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Suresh Srinivas
>            Assignee: Jitendra Nath Pandey
>         Attachments: hdfs-1975.txt, hdfs-1975.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 namenode state current in the standby node. To do this, the proposed solution in this
jira is to use a shared storage to store the namenode state. 
> Note one could also build an alternative solution by augmenting the backup node. A seperate
jira could explore this.

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