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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2700) Handle master failover for regions in transition
Date Wed, 23 Jun 2010 12:55:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881673#action_12881673
] 

Jonathan Gray commented on HBASE-2700:
--------------------------------------

1. Master knows he is a failed-over master.
2. Determine if any RegionServers crashed by diffing ephemeral list with master-managed list.
   If so, process dead servers.
3. Get list of nodes in UNASSIGNED
   (CLOSING)    -> Wait.  This should enter CLOSED eventually.
					If timeout, deal with in same way we would deal with timeout w/o failover
   (CLOSED)		-> Generate a destination RS.  Send that RS an open message.
					The RS who gets the open message will only open if he can switch it from
					CLOSED to OPENING.  This ensures an open only occurs in one place.
   (OPENING)	-> Wait.  This should enter OPENED eventually.
					If timeout, deal with in same way we would deal with timeout w/o failover
   (OPENED)		-> Remove the znode, this region is not in transition any more.


> Handle master failover for regions in transition
> ------------------------------------------------
>
>                 Key: HBASE-2700
>                 URL: https://issues.apache.org/jira/browse/HBASE-2700
>             Project: HBase
>          Issue Type: Sub-task
>          Components: master, zookeeper
>            Reporter: Jonathan Gray
>            Priority: Critical
>             Fix For: 0.21.0
>
>
> To this point in HBASE-2692 tasks we have moved everything for regions in transition
into ZK, but we have not fully handled the master failover case.  This is to deal with that
and to write tests for it.

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