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https://issues.apache.org/jira/browse/HBASE-2692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891004#action_12891004
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stack commented on HBASE-2692:
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.bq "Master waits for the minimum number of RS to be available to be assigned
regions"
How long you going to wait? Whats the trigger that has you start assigning?
.bq "We assume that the Master will not fail until after the OFFLINE nodes have
been created in ZK"
And if it does? Is that for later?
.bq "Load balancer blocks until there are no regions in transition"
Doesn't just go back to sleep?
.bq - Master sends RPCs to each RS, telling them to OPEN their regions.
This is a new message?
.bq Master removes the region from all in-memory structures
Who updated .META.? The RS, right?
.bq "3. Table Enable/Disable"
This has to be better than what we currently have?
.bq "Master determines which regions need to be handled."
How?
.bq Master sends RPCs to RSs to open all the regions.
Whats this message look like? Its the new one mentioned above?
Will it take time figuring what was on the dead RS? Or will it be
near-instantaneous?
.bq " 4. RegionServer Failure"
I don't see mention of wait on RS WAL log spitting in here. Should it be
mentioned?
This is a nice doc. Jon. I see it sticking around long after master rewrite.
We'll point fellas here when they are trying to figure how this all worky-poos.
> Master rewrite and cleanup for 0.90
> -----------------------------------
>
> Key: HBASE-2692
> URL: https://issues.apache.org/jira/browse/HBASE-2692
> Project: HBase
> Issue Type: Improvement
> Reporter: Jonathan Gray
> Assignee: Jonathan Gray
> Priority: Blocker
> Fix For: 0.90.0
>
> Attachments: BRANCH_NOTES.txt
>
>
> This is the parent issue for master changes targeted at 0.90 release.
> Changes done as part of this issue grew out of work done over in HBASE-2485
> to move region transitions into ZK.
> In addition to that work, this issue will include general HMaster and
> ZooKeeper refactorings and cleanups.
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