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https://issues.apache.org/jira/browse/HBASE-3071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917091#action_12917091
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Jean-Daniel Cryans commented on HBASE-3071:
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+1
> Graceful decommissioning of a regionserver
> ------------------------------------------
>
> Key: HBASE-3071
> URL: https://issues.apache.org/jira/browse/HBASE-3071
> Project: HBase
> Issue Type: Improvement
> Reporter: stack
>
> Currently if you stop a regionserver nicely, it'll put up its stopping flag
> and then close all hosted regions. While the stopping flag is in place all
> region requests are rejected. If this server was under load, closing could
> take a while. Only after all is closed is the master informed and it'll
> restart assigning (in old master, master woud get a report with list of all
> regions closed, in new master the zk expired is triggered and we'll run
> shutdown handler).
> At least in new master, we have means of disabling balancer, and then moving
> the regions off the server one by one via HBaseAdmin methods -- we shoud
> write a script to do this at least for rolling restarts -- but we need
> something better.
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