HBase cannot close issues and handles for long periods of time (waiting on regionserver (s) to go down)

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HBase cannot be closed for long periods [waiting on regionserver (s) to go]

In order to release the deleted region, restart HBase and execute the./bin/stop-hbase.sh.

Waited for a long time has not been closed, check the master log, display has been waiting for Regionserver

2015-07-08 09:11:25,800 INFO org.apache.hadoop.hbase.master.ServerManager:Waiting on Regionserver (s) to go down colander-hb01,60020,1435801056660

To view this regionserver situation, the log shows that region was not online

2015-07-08 09:17:34,419 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer:NotServingRegionException; Region was not online:colander_downloadedurl,com.soku.www:http/t/nisearch/camino+sangriento+6/_cid_15_time_100_ Sort_score_display_album_high_24?sfilter=1,1417099858158.e9e95f20d0f45860aa0778a5b6e97dbc.

Trapped in a dead loop, you can never finish closing.

Try to manually force shutdown Regionserver, succeeded

./bin/hbase-daemons.sh Stop Regionserver

Immediately, HBase closes successfully.