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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2752) HA: exit if multiple shared dirs are configured
Date Mon, 06 Feb 2012 20:49:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201568#comment-13201568
] 

Todd Lipcon commented on HDFS-2752:
-----------------------------------

The other issue is that, in order to support multiple shared edits, we'd need a quorum-like
behavior rather than the current "at least one" behavior. Otherwise you could imagine that,
with two shared dirs (SD1 and SD2) and two NNs, you might have the case where NN1 is writing
to only SD1 and NN2 is reading from only SD2. Let's continue this discussion on HDFS-2782
                
> HA: exit if multiple shared dirs are configured
> -----------------------------------------------
>
>                 Key: HDFS-2752
>                 URL: https://issues.apache.org/jira/browse/HDFS-2752
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hdfs-2752.txt
>
>
> We don't support multiple shared edits dirs, we should fail to start with an error in
this case.

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