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From "Jinsong Hu" <jinsong...@hotmail.com>
Subject master shows the region but regionserver doesn't show. Why can this happen ?
Date Mon, 13 Sep 2010 18:19:40 GMT
Hi,
  I have noticed that my hbase client is complaining that

Trying to contact region server m0002036.ppops.net:60020 for region 
HEARTBEAT_CLUSTER,,1279930490584.a84b7160318e91ef51c7efd215cd7e46., row 
'time\x09weekly\x092010W30', but failed after 10 attempts.

I then go to the hbase master web page and it shows that this region is 
there and served by one of the region server. however,
I clicked on the link for that regionserver and found that this region is 
not listed on the served regions. I then searched the log on this region
server and I found the regionserver actually closed this region:

2010-09-13 13:16:58,602 INFO org.apache.hadoop.hbase.regionserver.Store: 
Complet
ed major compaction of 4 file(s) in fields of 
HEARTBEAT_CLUSTER,,1279930490584.a
84b7160318e91ef51c7efd215cd7e46.; new storefile is 
hdfs://d-namenodes1.cloud.ppo
ps.net:8020/hbase/HEARTBEAT_CLUSTER/a84b7160318e91ef51c7efd215cd7e46/fields/8534
678064854849666; store size is 102.6m
2010-09-13 13:16:58,602 INFO org.apache.hadoop.hbase.regionserver.HRegion: 
compa
ction completed on region 
HEARTBEAT_CLUSTER,,1279930490584.a84b7160318e91ef51c7e
fd215cd7e46. in 46sec
2010-09-13 16:24:31,981 DEBUG 
org.apache.hadoop.hbase.regionserver.HRegionServer
: Closing region 
HEARTBEAT_CLUSTER,,1279930490584.a84b7160318e91ef51c7efd215cd7e
46.
2010-09-13 16:24:31,982 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: 
Clos
ing HEARTBEAT_CLUSTER,,1279930490584.a84b7160318e91ef51c7efd215cd7e46.: 
disablin
g compactions & flushes
2010-09-13 16:24:32,028 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: 
Upda
tes disabled for region, no outstanding scanners on 
HEARTBEAT_CLUSTER,,127993049
0584.a84b7160318e91ef51c7efd215cd7e46.
2010-09-13 16:24:32,031 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: 
No m
ore row locks outstanding on region 
HEARTBEAT_CLUSTER,,1279930490584.a84b7160318
e91ef51c7efd215cd7e46.
2010-09-13 16:24:32,057 INFO org.apache.hadoop.hbase.regionserver.HRegion: 
Close
d HEARTBEAT_CLUSTER,,1279930490584.a84b7160318e91ef51c7efd215cd7e46.

That means nobody can access this table any more. How could this happen ? I 
checked HDFS and confirmed the files for this
table is there.  I am using the CDH3 beta 2 hbase 0.89 version. I end up 
having to restart all regionservers to get this region online.


Jimmy. 


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