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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2700) Handle master failover for regions in transition
Date Thu, 24 Jun 2010 04:28:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882032#action_12882032
] 

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

Context of above is just a quick first go at what a master will do when it is a failed-over-to
master.

The ZK-based region transitions definitely break with the BT paper.  This direction came out
of discussions about the best way to persist master state over in HBASE-2485.

I'm generally very in favor of moving the master away from the basescanner/heartbeat way of
doing things towards zk and rpc.  Assignment is untenable in the current style and master
failover does not currently work.  This design makes this stuff a lot easier imo, not to mention
faster.

We can address specifics as patches come in, but in general is there opposition to the design
of using zk for regions in transition and assignment rather than the basescanner and heartbeats?

> 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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