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From "Daniel Leffel" <daniel.lef...@gmail.com>
Subject Re: Region Server Processes Exit Unexpectedly during Moderate Load MapReduce
Date Tue, 15 Apr 2008 22:43:27 GMT
I was running 0.1.0 (hadn't noticed the new release). To rule out that
as the issue, I've since upgraded to 0.1.1. I am still seeing the same
behavior. Also, I'm running on top of Hadoop 0.16.1.

Interestingly, during the latest test, the master process died too.

Not sure what to be looking for in the DEBUG output, but here's a few
interesting entries.

Here's the master node when one of the region servers died:
-------------------------------------
2008-04-15 18:09:08,232 INFO org.apache.hadoop.hbase.Leases:
HMaster.leaseChecker lease expired 1563117711/1563117711
2008-04-15 18:09:08,232 INFO org.apache.hadoop.hbase.HMaster:
10.252.39.164:60020 lease expired
2008-04-15 18:09:10,201 INFO org.apache.hadoop.hbase.HMaster:
assigning region -ROOT-,,0 to the only server 10.252.67.181:60020
2008-04-15 18:09:13,211 DEBUG org.apache.hadoop.hbase.HMaster:
Received MSG_REPORT_PROCESS_OPEN : -ROOT-,,0 from 10.252.67.181:60020
2008-04-15 18:09:13,211 DEBUG org.apache.hadoop.hbase.HMaster:
Received MSG_REPORT_OPEN : -ROOT-,,0 from 10.252.67.181:60020
2008-04-15 18:09:13,211 INFO org.apache.hadoop.hbase.HMaster:
10.252.67.181:60020 serving -ROOT-,,0
2008-04-15 18:09:30,963 WARN org.apache.hadoop.hbase.HMaster: Scan ROOT region
java.net.SocketTimeoutException: timed out waiting for rpc response
        at org.apache.hadoop.ipc.Client.call(Client.java:514)
        at org.apache.hadoop.hbase.ipc.HbaseRPC$Invoker.invoke(HbaseRPC.java:210)
        at $Proxy1.openScanner(Unknown Source)
        at org.apache.hadoop.hbase.HMaster$BaseScanner.scanRegion(HMaster.java:227)
        at org.apache.hadoop.hbase.HMaster$RootScanner.scanRoot(HMaster.java:540)
        at org.apache.hadoop.hbase.HMaster$RootScanner.maintenanceScan(HMaster.java:565)
        at org.apache.hadoop.hbase.HMaster$BaseScanner.chore(HMaster.java:207)
        at org.apache.hadoop.hbase.Chore.run(Chore.java:63)
2008-04-15 18:09:30,965 INFO org.apache.hadoop.hbase.HMaster:
HMaster.rootScanner scanning meta region {regionname: -ROOT-,,0,
startKey: <>, server: 10.252.67.181:60020}
2008-04-15 18:09:30,974 DEBUG org.apache.hadoop.hbase.HMaster:
HMaster.rootScanner regioninfo: {regionname: .META.,,1, startKey: <>,
endKey: <>, encodedName: 1028785192, tableDesc: {name: .META.,
families: {info:={name: info, max versions: 1, compression: NONE, in
memory: false, max length: 2147483647, bloom filter: none}}}}, server:
10.252.67.181:60020, startCode: 1208278043501
2008-04-15 18:09:30,974 DEBUG org.apache.hadoop.hbase.HMaster: Current
assignment of .META.,,1 is not valid: storedInfo: address:
10.252.67.181:60020, startcode: 1208296518624, load: (requests: 0
regions: 12), startCode: 1208278043501, storedInfo.startCode:
1208296518624, unassignedRegions: false, pendingRegions: false
2008-04-15 18:09:30,975 INFO org.apache.hadoop.hbase.HMaster:
HMaster.rootScanner scan of meta region {regionname: -ROOT-,,0,
startKey: <>, server: 10.252.67.181:60020} complete
2008-04-15 18:09:31,271 INFO org.apache.hadoop.hbase.HMaster:
assigning region .META.,,1 to the only server 10.252.67.181:60020
2008-04-15 18:09:34,281 DEBUG org.apache.hadoop.hbase.HMaster:
Received MSG_REPORT_PROCESS_OPEN : .META.,,1 from 10.252.67.181:60020
2008-04-15 18:09:35,602 INFO org.apache.hadoop.hbase.HMaster:
HMaster.metaScanner scanning meta region {regionname: .META.,,1,
startKey: <>, server: 10.252.67.181:60020}
------------------------



Other curious entries from master when the regionserver died:
-------------------------------
2008-04-15 18:11:20,904 DEBUG org.apache.hadoop.hbase.HLog: Splitting
66 of 70: hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208296519099_60020/hlog.dat.066
2008-04-15 18:11:21,756 DEBUG org.apache.hadoop.hbase.HLog: Applied
30734 total edits
2008-04-15 18:11:21,763 DEBUG org.apache.hadoop.hbase.HLog: Splitting
67 of 70: hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208296519099_60020/hlog.dat.067
2008-04-15 18:11:23,608 DEBUG org.apache.hadoop.hbase.HLog: Applied
30060 total edits
2008-04-15 18:11:23,641 DEBUG org.apache.hadoop.hbase.HLog: Splitting
68 of 70: hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208296519099_60020/hlog.dat.068
2008-04-15 18:11:24,421 DEBUG org.apache.hadoop.hbase.HLog: Applied
30008 total edits
2008-04-15 18:11:24,424 DEBUG org.apache.hadoop.hbase.HLog: Splitting
69 of 70: hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208296519099_60020/hlog.dat.069
2008-04-15 18:11:24,424 INFO org.apache.hadoop.hbase.HLog: Skipping
org.apache.hadoop.fs.FileStatus@593db81a because zero length
2008-04-15 18:11:25,563 INFO org.apache.hadoop.hbase.HLog: log file
splitting completed for
hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208296519099_60020
2008-04-15 18:11:25,563 DEBUG org.apache.hadoop.hbase.HMaster: process
server shutdown scanning root region on 10.252.67.181
2008-04-15 18:11:25,572 DEBUG org.apache.hadoop.hbase.HMaster: process
server shutdown scanning root region on 10.252.67.181 finished HMaster
2008-04-15 18:11:25,572 DEBUG org.apache.hadoop.hbase.HMaster:
numberOfMetaRegions: 1, onlineMetaRegions.size(): 1
2008-04-15 18:11:25,572 DEBUG org.apache.hadoop.hbase.HMaster: process
server shutdown scanning .META.,,1 on 10.252.67.181:60020 HMaster
attempt 0
2008-04-15 18:11:25,580 INFO org.apache.hadoop.hbase.HMaster:
category_rule_pricebin_statistics,2332627_1_-11,1208293443363 was on
shutdown server <10.252.39.164:60020> (or server is null --
org.apache.hadoop.hbase.HRegionServer@d402dd --). Marking unassigned
in meta and clearing pendingRegions
2008-04-15 18:11:25,583 INFO org.apache.hadoop.hbase.HMaster:
category_to_all_parents,6597500,1207947088224 was on shutdown server
<10.252.39.164:60020> (or server is null --
org.apache.hadoop.hbase.HRegionServer@d402dd --). Marking unassigned
in meta and clearing pendingRegions
2008-04-15 18:11:25,585 INFO org.apache.hadoop.hbase.HMaster:
category_to_all_parents_map,11429436,1208214299908 was on shutdown
server <10.252.39.164:60020> (or server is null --
org.apache.hadoop.hbase.HRegionServer@d402dd --). Marking unassigned
in meta and clearing pendingRegions
2008-04-15 18:11:25,587 INFO org.apache.hadoop.hbase.HMaster:
category_to_all_parents_map,13948388,1208214507790 was on shutdown
server <10.252.39.164:60020> (or server is null --
org.apache.hadoop.hbase.HRegionServer@d402dd --). Marking unassigned
in meta and clearing pendingRegions
2008-04-15 18:11:25,588 INFO org.apache.hadoop.hbase.HMaster:
category_to_all_parents_map,2039541,1208212644065 was on shutdown
server <10.252.39.164:60020> (or server is null --
org.apache.hadoop.hbase.HRegionServer@d402dd --). Marking unassigned
in meta and clearing pendingRegions
2008-04-15 18:11:25,591 INFO org.apache.hadoop.hbase.HMaster:
category_to_all_parents_map,4050172,1208212849307 was on shutdown
server <10.252.39.164:60020> (or server is null --
org.apache.hadoop.hbase.HRegionServer@d402dd --). Marking unassigned
in meta and clearing pendingRegions
2008-04-15 18:11:25,594 INFO org.apache.hadoop.hbase.HMaster:
category_to_all_parents_map,8265783,1208211269830 was on shutdown
server <10.252.39.164:60020> (or server is null --
org.apache.hadoop.hbase.HRegionServer@d402dd --). Marking unassigned
in meta and clearing pendingRegions
2008-04-15 18:11:25,595 INFO org.apache.hadoop.hbase.HMaster:
category_to_all_parents_map,8665350,1208211269830 was on shutdown
server <10.252.39.164:60020> (or server is null --
org.apache.hadoop.hbase.HRegionServer@d402dd --). Marking unassigned
in meta and clearing pendingRegions
2008-04-15 18:11:25,596 INFO org.apache.hadoop.hbase.HMaster:
category_to_immediate_children_map,,1208288806024 was on shutdown
server <10.252.39.164:60020> (or server is null --
org.apache.hadoop.hbase.HRegionServer@d402dd --). Marking unassigned
in meta and clearing pendingRegions
2008-04-15 18:11:25,597 DEBUG org.apache.hadoop.hbase.HMaster: process
server shutdown finished scanning .META.,,1 on 10.252.67.181:60020
HMaster
2008-04-15 18:11:26,372 INFO org.apache.hadoop.hbase.HMaster:
assigning region category_to_all_parents_map,13948388,1208214507790 to
the only server 10.252.67.181:60020
2008-04-15 18:11:26,372 INFO org.apache.hadoop.hbase.HMaster:
assigning region
category_rule_pricebin_statistics,2332627_1_-11,1208293443363 to the
only server 10.252.67.181:60020
2008-04-15 18:11:26,372 INFO org.apache.hadoop.hbase.HMaster:
assigning region category_to_all_parents_map,4050172,1208212849307 to
the only server 10.252.67.181:60020
2008-04-15 18:11:26,372 INFO org.apache.hadoop.hbase.HMaster:
assigning region category_to_immediate_children_map,,1208288806024 to
the only server 10.252.67.181:60020
2008-04-15 18:11:26,372 INFO org.apache.hadoop.hbase.HMaster:
assigning region category_to_all_parents_map,2039541,1208212644065 to
the only server 10.252.67.181:60020
2008-04-15 18:11:26,372 INFO org.apache.hadoop.hbase.HMaster:
assigning region category_to_all_parents,6597500,1207947088224 to the
only server 10.252.67.181:60020
2008-04-15 18:11:26,372 INFO org.apache.hadoop.hbase.HMaster:
assigning region category_to_all_parents_map,8265783,1208211269830 to
the only server 10.252.67.181:60020
2008-04-15 18:11:26,372 INFO org.apache.hadoop.hbase.HMaster:
assigning region category_to_all_parents_map,11429436,1208214299908 to
the only server 10.252.67.181:60020
2008-04-15 18:11:26,372 INFO org.apache.hadoop.hbase.HMaster:
assigning region category_to_all_parents_map,8665350,1208211269830 to
the only server 10.252.67.181:60020
2008-04-15 18:11:30,130 DEBUG org.apache.hadoop.hbase.HMaster:
Received MSG_REPORT_PROCESS_OPEN :
category_to_all_parents_map,13948388,1208214507790 from
10.252.67.181:60020
2008-04-15 18:11:30,130 DEBUG org.apache.hadoop.hbase.HMaster:
Received MSG_REPORT_PROCESS_OPEN :
category_rule_pricebin_statistics,2332627_1_-11,1208293443363 from
10.252.67.181:60020
2008-04-15 18:11:30,130 DEBUG org.apache.hadoop.hbase.HMaster:
Received MSG_REPORT_PROCESS_OPEN :
category_to_all_parents_map,4050172,1208212849307 from
10.252.67.181:60020
2008-04-15 18:11:30,130 DEBUG org.apache.hadoop.hbase.HMaster:
Received MSG_REPORT_PROCESS_OPEN :
category_to_immediate_children_map,,1208288806024 from
10.252.67.181:60020
---------------------------------------------


The Exception that is thrown is almost either one of the following:
----------------------------------
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException:
category_rule_pricebin_statistics,,1208222885052
	at org.apache.hadoop.hbase.HRegionServer.getRegion(HRegionServer.java:1639)
	at org.apache.hadoop.hbase.HRegionServer.getRegion(HRegionServer.java:1611)
	at org.apache.hadoop.hbase.HRegionServer.batchUpdate(HRegionServer.java:1460)
	at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.hbase.ipc.HbaseRPC$Server.call(HbaseRPC.java:413)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:899)

	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
	at org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:82)
	at org.apache.hadoop.hbase.HTable.getRegionServerWithRetries(HTable.java:1028)
	at org.apache.hadoop.hbase.HTable.commit(HTable.java:763)
	at org.apache.hadoop.hbase.HTable.commit(HTable.java:744)
--------------------------------------

-- or ---

---------------------------------------
java.lang.RuntimeException: java.lang.reflect.UndeclaredThrowableException
	at org.apache.hadoop.hbase.HTable.getRegionServerWithRetries(HTable.java:1050)
	at org.apache.hadoop.hbase.HTable.commit(HTable.java:763)
	at org.apache.hadoop.hbase.HTable.commit(HTable.java:744)
	at com.rexee.bandito.hadoop.categoryhierarcycreation.CreateMapOfCategoryToImmediateChildren$Reduce.reduce(CreateMapOfCategoryToImmediateChildren.java:93)
	at com.rexee.bandito.hadoop.categoryhierarcycreation.CreateMapOfCategoryToImmediateChildren$Reduce.reduce(CreateMapOfCategoryToImmediateChildren.java:1)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.combineAndSpill(MapTask.java:522)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpillToDisk(MapTask.java:493)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:713)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:209)
	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2084)
Caused by: java.lang.reflect.UndeclaredThrowableException
	at $Proxy2.findRootRegion(Unknown Source)
	at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:706)
	at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:336)
	at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:313)
	at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:409)
	at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:346)
	at org.apache.hadoop.hbase.HConnectionManager$TableServers.relocateRegion(HConnectionManager.java:318)
	at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:482)
	at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:350)
	at org.apache.hadoop.hbase.HConnectionManager$TableServers.relocateRegion(HConnectionManager.java:318)
	at org.apache.hadoop.hbase.HTable.getRegionLocation(HTable.java:114)
	at org.apache.hadoop.hbase.HTable$ServerCallable.instantiateServer(HTable.java:1009)
	at org.apache.hadoop.hbase.HTable.getRegionServerWithRetries(HTable.java:1024)
	... 9 more
Caused by: java.net.ConnectException: Connection refused
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
	at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
	at java.net.Socket.connect(Socket.java:519)
	at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:161)
	at org.apache.hadoop.ipc.Client.getConnection(Client.java:578)
	at org.apache.hadoop.ipc.Client.call(Client.java:501)
	at org.apache.hadoop.hbase.ipc.HbaseRPC$Invoker.invoke(HbaseRPC.java:210)
	... 22 more
---------------------------



The region server does a lot of log rolling. Is this normal?
-----------------------------------------------
2008-04-15 18:24:22,577 WARN org.apache.hadoop.hbase.util.Sleeper: We
slept 37782ms, ten times longer than scheduled: 3000
2008-04-15 18:24:26,738 INFO org.apache.hadoop.hbase.HRegionServer:
Rolling hlog. Number of entries: 30006
2008-04-15 18:24:26,749 DEBUG org.apache.hadoop.hbase.HLog: Closing
current log writer
hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208297751167_60020/hlog.dat.053
to get a new one
2008-04-15 18:24:26,760 INFO org.apache.hadoop.hbase.HLog: new log
writer created at
hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208297751167_60020/hlog.dat.054
2008-04-15 18:24:33,073 INFO org.apache.hadoop.hbase.HRegionServer:
Rolling hlog. Number of entries: 30450
2008-04-15 18:24:33,409 DEBUG org.apache.hadoop.hbase.HLog: Closing
current log writer
hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208297751167_60020/hlog.dat.054
to get a new one
2008-04-15 18:24:33,419 INFO org.apache.hadoop.hbase.HLog: new log
writer created at
hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208297751167_60020/hlog.dat.055
-------------------------------------------------


After a lot of rolling, this happens:
------------------------------------------------
2008-04-15 18:38:59,716 INFO org.apache.hadoop.hbase.HLog: new log
writer created at
hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208297751167_60020/hlog.dat.159
2008-04-15 18:39:02,113 INFO org.apache.hadoop.hbase.HRegionServer:
Rolling hlog. Number of entries: 30360
2008-04-15 18:39:02,236 DEBUG org.apache.hadoop.hbase.HLog: Closing
current log writer
hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208297751167_60020/hlog.dat.159
to get a new one
2008-04-15 18:39:02,238 INFO org.apache.hadoop.hbase.HLog: new log
writer created at
hdfs://domU-12-31-38-00-8E-14:50001/hbase/log_10.252.39.164_1208297751167_60020/hlog.dat.160
2008-04-15 18:39:05,626 INFO org.apache.hadoop.hbase.HRegion: Blocking
updates for 'IPC Server handler 1 on 60020': Memcache size 64.0m is >=
than blocking 64.0m size
2008-04-15 18:39:05,626 INFO org.apache.hadoop.hbase.HRegion: Blocking
updates for 'IPC Server handler 7 on 60020': Memcache size 64.0m is >=
than blocking 64.0m size
2008-04-15 18:39:05,626 INFO org.apache.hadoop.hbase.HRegion: Blocking
updates for 'IPC Server handler 8 on 60020': Memcache size 64.0m is >=
than blocking 64.0m size
2008-04-15 18:39:05,626 INFO org.apache.hadoop.hbase.HRegion: Blocking
updates for 'IPC Server handler 9 on 60020': Memcache size 64.0m is >=
than blocking 64.0m size
2008-04-15 18:39:05,626 INFO org.apache.hadoop.hbase.HRegion: Blocking
updates for 'IPC Server handler 4 on 60020': Memcache size 64.0m is >=
than blocking 64.0m size
2008-04-15 18:39:05,626 INFO org.apache.hadoop.hbase.HRegion: Blocking
updates for 'IPC Server handler 3 on 60020': Memcache size 64.0m is >=
than blocking 64.0m size
2008-04-15 18:39:05,627 DEBUG org.apache.hadoop.hbase.HRegion: Started
memcache flush for region
category_rule_pricebin_statistics,2332627_1_-11,1208293443363. Size
64.0m
2008-04-15 18:39:09,544 DEBUG org.apache.hadoop.hbase.HStore: Added
1064767197/adjusted_q/3161297904753567399 with 0 entries, sequence id
64293357, and size 110.0 for 1064767197/adjusted_q
2008-04-15 18:39:15,489 DEBUG org.apache.hadoop.hbase.HStore: Added
1064767197/rule_id/5414884402918348270 with 285058 entries, sequence
id 64293357, and size 11.8m for 1064767197/rule_id
2008-04-15 18:39:15,641 INFO org.apache.hadoop.hbase.HRegion:
Unblocking updates for region
category_rule_pricebin_statistics,2332627_1_-11,1208293443363 'IPC
Server handler 1 on 60020'
2008-04-15 18:39:15,641 INFO org.apache.hadoop.hbase.HRegion:
Unblocking updates for region
category_rule_pricebin_statistics,2332627_1_-11,1208293443363 'IPC
Server handler 7 on 60020'
2008-04-15 18:39:15,641 INFO org.apache.hadoop.hbase.HRegion:
Unblocking updates for region
category_rule_pricebin_statistics,2332627_1_-11,1208293443363 'IPC
Server handler 8 on 60020'
2008-04-15 18:39:15,641 INFO org.apache.hadoop.hbase.HRegion:
Unblocking updates for region
category_rule_pricebin_statistics,2332627_1_-11,1208293443363 'IPC
Server handler 9 on 60020'
2008-04-15 18:39:15,641 INFO org.apache.hadoop.hbase.HRegion:
Unblocking updates for region
category_rule_pricebin_statistics,2332627_1_-11,1208293443363 'IPC
Server handler 4 on 60020'
2008-04-15 18:39:15,641 INFO org.apache.hadoop.hbase.HRegion:
Unblocking updates for region
category_rule_pricebin_statistics,2332627_1_-11,1208293443363 'IPC
Server handler 3 on 60020'
2008-04-15 18:39:16,739 INFO org.apache.hadoop.hbase.HRegionServer:
Rolling hlog. Number of entries: 33252
2008-04-15 18:39:45,008 INFO org.apache.hadoop.hbase.HRegionServer:
MSG_REGION_OPEN : .META.,,1
2008-04-15 18:39:51,636 DEBUG org.apache.hadoop.hbase.HStore: Added
1064767197/category_id/5081092265153632091 with 285058 entries,
sequence id 64293357, and size 14.5m for 1064767197/category_id
2008-04-15 18:40:09,041 DEBUG org.apache.hadoop.hbase.HStore: Added
1064767197/success_count/2540574911286829228 with 285058 entries,
sequence id 64293357, and size 13.4m for 1064767197/success_count
2008-04-15 18:40:12,707 DEBUG org.apache.hadoop.hbase.HStore: Added
1064767197/adjusted_deviation/270946121541713279 with 0 entries,
sequence id 64293357, and size 110.0 for 1064767197/adjusted_deviation
2008-04-15 18:40:30,453 DEBUG org.apache.hadoop.hbase.HStore: Added
1064767197/hidden_variable/493176493179028867 with 285058 entries,
sequence id 64293357, and size 16.6m for 1064767197/hidden_variable
---------------------------------------------------


On Tue, Apr 15, 2008 at 9:12 AM, stack <stack@duboce.net> wrote:
> You are running 0.1.1 hbase?  Please enable DEBUG logging, see http://wiki.apache.org/hadoop/Hbase/FAQ#5
for how, and send over a log.
> Thanks,
> St.Ack
>
>
>
>
> Daniel Leffel wrote:
>
> > Hi,
> > I'm new to HBase and investigating it for use in our large production
> > environment. Largely, I'm quite impressed by the possibilities.
> >
> > One bit of behavior I'm noticing is that region servers tend to quit
> > unexpectedly during moderately loaded map/reduce jobs without really any
> > helpful information in the logs as to why.
> >
> > Is the behavior expected? How else should I be troubleshooting?
> >
> > Thanks in advance!
> >
> > Danny Leffel
> >
> >
> >
>
>

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