Close, split, open of regions in RegionServer are run by a single thread only.
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Key: HBASE-2405
URL: https://issues.apache.org/jira/browse/HBASE-2405
Project: Hadoop HBase
Issue Type: Bug
Reporter: stack
Fix For: 0.20.4, 0.21.0
JGray and Karthik observed yesterday that a regoin open message arrived at the
regionserver but that the regionserver worker thread did not get around to the
actually opening until 45 seconds later (region offline for 45 seconds). We
only run a single Worker thread in a regoinserver processing open, close, and
splits. In this case, a long running close (or two) held up the worker thread.
We need to run more than a single worker. A pool of workers? Should opens be
prioritized?
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