Heng:
Can you pastebin the complete stack trace for the region server ?

Snippet from region server log may also provide more clue.

Thanks

On Wed, May 25, 2016 at 9:48 PM, Heng Chen <heng.chen.1986@gmail.com> wrote:

> On master web UI, i could see region (c371fb20c372b8edbf54735409ab5c4a)
> always in failed close state,  So balancer could not run.
>
>
> i check the region on RS,  and found logs about this region
>
> 2016-05-26 12:42:10,490 INFO  [MemStoreFlusher.1]
> regionserver.MemStoreFlusher: Waited 90447ms on a compaction to clean up
> 'too many store files'; waited long enough... proceeding with flush of
>
> frog_stastic,\xFC\xAD\xD4\x07_{211}_1460209650596,1464149036644.c371fb20c372b8edbf54735409ab5c4a.
> 2016-05-26 12:42:20,043 INFO
>  [dx-pipe-regionserver4-online,16020,1464166626969_ChoreService_1]
> regionserver.HRegionServer:
> dx-pipe-regionserver4-online,16020,1464166626969-MemstoreFlusherChore
> requesting flush for region
>
> frog_stastic,\xFC\xAD\xD4\x07_{211}_1460209650596,1464149036644.c371fb20c372b8edbf54735409ab5c4a.
> after a delay of 20753
> 2016-05-26 12:42:30,043 INFO
>  [dx-pipe-regionserver4-online,16020,1464166626969_ChoreService_1]
> regionserver.HRegionServer:
> dx-pipe-regionserver4-online,16020,1464166626969-MemstoreFlusherChore
> requesting flush for region
>
> frog_stastic,\xFC\xAD\xD4\x07_{211}_1460209650596,1464149036644.c371fb20c372b8edbf54735409ab5c4a.
> after a delay of 7057
>
>
> relate jstack information like below:
>
> Thread 12403 (RS_CLOSE_REGION-dx-pipe-regionserver4-online:16020-2):
>   State: WAITING
>   Blocked count: 1
>   Waited count: 2
>   Waiting on
> org.apache.hadoop.hbase.regionserver.HRegion$WriteState@1390594c
>   Stack:
>     java.lang.Object.wait(Native Method)
>     java.lang.Object.wait(Object.java:502)
>
> org.apache.hadoop.hbase.regionserver.HRegion.waitForFlushesAndCompactions(HRegion.java:1512)
>     org.apache.hadoop.hbase.regionserver.HRegion.doClose(HRegion.java:1371)
>     org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:1336)
>
> org.apache.hadoop.hbase.regionserver.handler.CloseRegionHandler.process(CloseRegionHandler.java:138)
>
> org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:128)
>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>     java.lang.Thread.run(Thread.java:745)
>
>
> Our HBase cluster version is 1.1.1,   i try to compact this region,
> compact stuck in progress 89.58%
>
>
> frog_stastic,\xFC\xAD\xD4\x07_{211}_1460209650596,1464149036644.c371fb20c372b8edbf54735409ab5c4a.
> 85860221 85860221
> 89.58%
>