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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3071) Graceful decommissioning of a regionserver
Date Fri, 01 Oct 2010 23:09:32 GMT
Graceful decommissioning of a regionserver
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                 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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