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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1973) HA: HDFS clients must handle namenode failover and switch over to the new active namenode.
Date Fri, 26 Aug 2011 21:39:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13092073#comment-13092073
] 

Aaron T. Myers commented on HDFS-1973:
--------------------------------------

@Eli, sure I'll file a separate JIRA. It'd certainly be worth enumerating all of the places
where HTTP fail-over is an issue.

The example you provided is an interesting one. It seems you're assuming that an HA setup
would have three nodes - active, standby, and 2NN, with the 2NN failing over to do checkpointing
against the standby after a failure of the active. The design document in HDFS-1623 doesn't
really address checkpointing. I've heard from Suresh and Todd informally that the intention
is probably to make the standby node also capable of performing checkpointing. I'll file a
separate JIRA to address this as well.

> HA: HDFS clients must handle namenode failover and switch over to the new active namenode.
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1973
>                 URL: https://issues.apache.org/jira/browse/HDFS-1973
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Suresh Srinivas
>            Assignee: Aaron T. Myers
>
> During failover, a client must detect the current active namenode failure and switch
over to the new active namenode. The switch over might make use of IP failover or some thing
more elaborate such as zookeeper to discover the new active.

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