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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