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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1974) HA: Introduce active and standby states to the namenode
Date Tue, 09 Aug 2011 16:32:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081743#comment-13081743
] 

Todd Lipcon commented on HDFS-1974:
-----------------------------------

bq. That is because currently NamenodeProtocols does not extend JournalProtocol. When BackupNode
code merges with Namenode, ActiveState rejecting JOURNAL operations will become necessary.

Using Sanjay's new support for mix-in RPC implementations, we can continue to keep JournalProtocol
separate, and only "mix it in" when starting up as the BN.

> HA: Introduce active and standby states to the namenode
> -------------------------------------------------------
>
>                 Key: HDFS-1974
>                 URL: https://issues.apache.org/jira/browse/HDFS-1974
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: HDFS-1974.1.patch, HDFS-1974.2.patch, HDFS-1974.3.patch, HDFS-1974.4.patch,
HDFS-1974.5.patch, HDFS-1974.patch
>
>
> Currently namenode supports active, secondary and backup roles. To support namenode high
availability, active and standby states are needed. Note that this is different from the existing
notion of namenode role, where a namenode cannot transition from one role to the other.

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