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From "Justin Joseph (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2124) Namenode HA using Backup Namenode as Hot Standby
Date Tue, 05 Jul 2011 12:24:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13059856#comment-13059856
] 

Justin Joseph commented on HDFS-2124:
-------------------------------------

1) I understand that many design decisions match with HDFS-1623. The major difference is that
HDFS-1623 adopts Shared Storage approach where as this solution uses Backup Namenode for data
synchronization from Active to Standby. (Backup Namenode approach is mentioned as the future
direction in HDFS-1623). Also, there are some differences in the way clients handle the Namenode
failover.

To avoid any conflict / duplication with HDFS-1623, I will create sub-tasks for each of the
logically independent parts in our implementation. It will help the community in reviewing
& committing those parts which compliment the implementation done for HDFS-1623.

2) Any comments on creating an additional patch for a 0.20.* version ?

> Namenode HA using Backup Namenode as Hot Standby
> ------------------------------------------------
>
>                 Key: HDFS-2124
>                 URL: https://issues.apache.org/jira/browse/HDFS-2124
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node, hdfs client, name-node
>    Affects Versions: 0.20.2, 0.21.0
>            Reporter: Justin Joseph
>         Attachments: Namenode HA using Backup Namenode as Hot Standby.pdf
>
>
> This is to share our experiences on building Automatic, Hot High Availability for Namenode,
leveraging the existing Backup Namenode.

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