Enis Soztutar created HBASE-10367:
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Summary: RegionServer graceful stop / decommissioning
Key: HBASE-10367
URL: https://issues.apache.org/jira/browse/HBASE-10367
Project: HBase
Issue Type: Improvement
Reporter: Enis Soztutar
Right now, we have a weird way of node decommissioning / graceful stop, which
is a graceful_stop.sh bash script, and a region_mover ruby script, and some
draining server support which you have to manually write to a znode (really!).
Also draining servers is only partially supported in LB operations (LB does
take that into account for roundRobin assignment, but not for normal balance)
See
http://hbase.apache.org/book/node.management.html and HBASE-3071
I think we should support graceful stop as a first class citizen. Thinking
about it, it seems that the difference between regionserver stop and graceful
stop is that regionserver stop will close the regions, but the master will only
assign them after the znode is deleted.
In the new master design (or even before), if we allow RS to be able to close
regions on its own (without master initiating it), then graceful stop becomes
regular stop. The RS already closes the regions cleanly, and will reject new
region assignments, so that we don't need much of the balancer or draining
server trickery.
This ties into the new master/AM redesign (HBASE-5487), but still deserves it's
own jira. Let's use this to brainstorm on the design.
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