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