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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-879) When dfs restarts or moves blocks around, hbase regionservers don't notice
Date Thu, 06 Sep 2012 06:06:08 GMT

    [ https://issues.apache.org/jira/browse/HBASE-879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13449443#comment-13449443
] 

stack commented on HBASE-879:
-----------------------------

I'm fine closing this.  The issue Michael talks of in original comment is not an issue any
more; the DFSClient should pick up blocks in new location getting new block locations list
from namenode.  Andrew's comment on hbase being able to survive a dfs restart under it is
still to be fixed (we have other issues to cover this though)
                
> When dfs restarts or moves blocks around, hbase regionservers don't notice
> --------------------------------------------------------------------------
>
>                 Key: HBASE-879
>                 URL: https://issues.apache.org/jira/browse/HBASE-879
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.18.1, 0.19.0
>            Reporter: Michael Bieniosek
>
> Since the hbase regionservers use a DFSClient to keep handles open to the dfs, if the
dfs blocks move around (typically because of a dfs restart, but can also happen if datanodes
die or blocks get shuffled around), the regionserver will be unable to service the region.
 It would be nice if the DFSClient that the regionservers use could notice this case and refresh
the block list. 

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