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From "Hari Mankude (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 Fri, 03 Feb 2012 17:53:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199908#comment-13199908
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Hari Mankude commented on HDFS-2769:
------------------------------------

I am not sure if this solution #2 is going to be acceptable even in v1. Shared storage (or
connectivity to shared storage) becomes the single point of failure. Network connections are
bound to be flaky. Edit log writes are synchronous and if write errors result in active NN
degrading to standby mode, then there is a good chance that this might happen in a data center.


                
> 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
>         Attachments: HDFS-2769-HDFS-1623.patch
>
>
> 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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