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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2782) HA: Support multiple shared edits dirs
Date Sat, 14 Jan 2012 00:58:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186039#comment-13186039
] 

Eli Collins commented on HDFS-2782:
-----------------------------------

#1 Expecting both independent failures (eg the dirs are one two separate mounts with different
underlying volumes may fail independently) and dependent failures (if the connection to the
same server is severed for example).

#2 Yes, a 2nd or 3rd shared dir is just like the first. Eg if the primary or standby marked
a shared dir as bad it and the standby could switch to another.
                
> HA: Support multiple shared edits dirs
> --------------------------------------
>
>                 Key: HDFS-2782
>                 URL: https://issues.apache.org/jira/browse/HDFS-2782
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>
> Supporting multiple shared dirs will improve availability (eg see HDFS-2769). You may
want to use multiple shared dirs on a single filer (eg for better fault isolation) or because
you want to use multiple filers/mounts. Per HDFS-2752 (and HDFS-2735) we need to do things
like use the JournalSet in EditLogTailer and add tests.

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