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https://issues.apache.org/jira/browse/HBASE-2697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882039#action_12882039
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Jonathan Gray commented on HBASE-2697:
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Re: RS doing editing of META, I'm not totally sure yet but was thinking we'd go
that way.
This will only really matter in the case of RS or M failure. If the RS does
it, that means that in case of RS failure the master/zk view could have a
region as OPENING but the RS may or may not have edited META. If M does it, RS
could have something opened, zk would say OPENED, but if the master dies, it
may or may not have edited META. The failed-over master would pick up the
OPENED node, it would do the META edit, and then delete the node. I don't
think there's actually a correctness issue here but does seem that the regions
availability is faster if the RS does the edit.
> Implement new open/close logic in handlers and stop using heartbeats for
> open/close messages
> --------------------------------------------------------------------------------------------
>
> Key: HBASE-2697
> URL: https://issues.apache.org/jira/browse/HBASE-2697
> Project: HBase
> Issue Type: Sub-task
> Components: ipc, master, regionserver
> Reporter: Jonathan Gray
> Priority: Critical
> Fix For: 0.21.0
>
>
> This issue is doing the meat of what HBASE-2485 is about and continues what
> was started in HBASE-2694 after some code cleanup to make life easier.
> This deals with no longer piggybacking messages from Master to RegionServers
> on heartbeat responses and instead sending direct unsolicited messages. This
> also deals with moving the open/close logic fully into handlers and removing
> the existing open/close code on both the RS and M sides. There may also be
> some changes to the master in-memory state of regions in transition. The new
> load balancer will probably be introduced with this issue but not fully
> integrated yet.
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