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From "HBase Review Board (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2697) Implement new open/close logic in handlers and stop using heartbeats for open/close messages
Date Fri, 23 Jul 2010 23:47:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891870#action_12891870

HBase Review Board commented on HBASE-2697:

Message from: "Jonathan Gray" <jgray@apache.org>

bq.  On 2010-07-23 16:35:42, Jonathan Gray wrote:
bq.  > Thinking on it, I will probably need to not just blindly force something to OFFLINE
in the masters force to OFFLINE.  Though any state will be able to be transitioned to OFFLINE
(during recovery, we may need to restart the assignment of something, setting to OFFLINE first
is what allows us to timeout if for some reason an RS doesn't respond/act on an OPEN rpc),
we will want to use more of a CAS operation so we don't accidentally miss a transition on
that node.
bq.  > 
bq.  > For example, we may timeout an OFFLINE because it took too long, so we want to switch
it back to a new version of OFFLINE and assign to someone else.  We'll want to ensure when
setting to OFFLINE it's still in the previously seen OFFLINE version, otherwise a server may
have started OPENING in between our check and set.

(this is not totally clear to me yet, going to wait until i get a bit further in integration
of this class)

- Jonathan

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> 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
>            Assignee: Jonathan Gray
>            Priority: Critical
>             Fix For: 0.90.0
> 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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