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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2769) HA: When HA is enabled with a shared edits dir, that dir should be marked required
Date Mon, 09 Jan 2012 04:45:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182369#comment-13182369
] 

Aaron T. Myers commented on HDFS-2769:
--------------------------------------

bq. We need to prevent failover if the active gets ahead of the standby,

This is the crux of the issue. How will the standby (or failover controller) know that the
shared edits dir hasn't been receiving updates, and therefore isn't up-to-date? We need to
ensure that FS updates hit the shared storage, or else on death of the active the standby
may come up as the active, but be missing recent edits.

Once HA supports multiple shared edits dirs, we should change things to support a pool of
shared edits dirs which are collectively treated as a required resource, but are individually
treated as redundant.
                
> HA: When HA is enabled with a shared edits dir, that dir should be marked required
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-2769
>                 URL: https://issues.apache.org/jira/browse/HDFS-2769
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>
> HDFS-2430 introduced the concept of "required" edits/name dirs, which are not treated
as redundant when considering NN storage failure. When a shared edits dir is used, this should
automatically be marked as required.

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