[jira] Commented: (HBASE-2975) DFSClient names in master and RS should be unique

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907531#action_12907531 ] 

stack commented on HBASE-2975:
------------------------------

+1

> DFSClient names in master and RS should be unique
> -------------------------------------------------
>
>                 Key: HBASE-2975
>                 URL: https://issues.apache.org/jira/browse/HBASE-2975
>             Project: HBase
>          Issue Type: Bug
>          Components: master, regionserver
>    Affects Versions: 0.90.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>         Attachments: hbase-2975.txt
>
>
> In the post-newmaster trunk, there's some code which gives the regionserver and masters fancy names based on hostname and port. This breaks log recovery, though, if the master starts recovering a log (ie has an append lease on a log file), then crashes and comes back on the same port. The NN doesn't see this as a new client, since the client name is the same, so it thinks it still holds a lease on the file. The new master, though, can't call append() because the NN thinks it's appending, so it loops forever.

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