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From Ameya Kantikar <am...@groupon.com>
Subject Re: Table in Inconsistent State; Perpetually pending region server transitions while loading lot of data into Hbase via MR
Date Thu, 01 Nov 2012 07:29:08 GMT
One more thing, the Hbase table in question is neither enabled, nor
disabled:

hbase(main):006:0> is_disabled 'userTable1'
false

0 row(s) in 0.0040 seconds

hbase(main):007:0> is_enabled 'userTable1'
false

0 row(s) in 0.0040 seconds

Ameya

On Thu, Nov 1, 2012 at 12:02 AM, Ameya Kantikar <ameya@groupon.com> wrote:

> Hi,
>
> I am trying to load lot of data (around 1.5 TB) into a single Hbase table.
> I have setup region size at 2 GB. I also
> set hbase.regionserver.handler.count at 30.
>
> When I start loading data via MR, after a while, tasks start failing with
> following error:
>
> org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException: Failed 1 action:
NotServingRegionException: 1 time, servers with issues: smartdeals-hbase8-snc1.snc1:60020,
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatchCallback(HConnectionManager.java:1641)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatch(HConnectionManager.java:1409)
> 	at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:943)
> 	at org.apache.hadoop.hbase.client.HTable.doPut(HTable.java:820)
> 	at org.apache.hadoop.hbase.client.HTable.put(HTable.java:795)
> 	at com..mr.hbase.LoadUserCacheInHbase$TokenizerMapper.map(LoadUserCacheInHbase.java:83)
> 	at com..mr.hbase.LoadUserCacheInHbase$TokenizerMapper.map(LoadUserCacheInHbase.java:33)
> 	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:140)
> 	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:645)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.j
>
> On the hbase8 machine I see following in logs:
>
> ERROR org.apache.hadoop.hbase.regionserver.wal.HLog: Error while syncing, requesting
close of hlog
> java.io.IOException: Reflection
>         at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:230)
>         at org.apache.hadoop.hbase.regionserver.wal.HLog.syncer(HLog.java:1109)
>         at org.apache.hadoop.hbase.regionserver.wal.HLog.sync(HLog.java:1213)
>         at org.apache.hadoop.hbase.regionserver.wal.HLog$LogSyncer.run(HLog.java:1071)
>         at java.lang.Thread.run(Thread.java:662)
> Caused by: java.lang.reflect.InvocationTargetException
>         at sun.reflect.GeneratedMethodAccessor11.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.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:228)
>         ... 4 more
>
>
> I only have 15 map tasks each on a 10 machine cluster (total 150 map tasks entering data
into Hbase table).
>
> Further, I see 2-3 regions perpetually under "Regions in Transitions" in Hbase master
web console as follows:
>
> 8dcb3edee4e43faa3dbeac2db4f12274userTable1,pookydearest@hotmail.com,1351728961461.8dcb3edee4e43faa3dbeac2db4f12274.
state=PENDING_OPEN, ts=Thu Nov 01 06:39:57 UTC 2012 (409s ago), server=smartdeals-hbase1-snc1.snc1,60020,1351751785514
>
>
> bb91fd0c855e60dd4159e0ad3fd52cdauserTable1,m_skaare@yahoo.com,1351728968936.bb91fd0c855e60dd4159e0ad3fd52cda.
state=PENDING_OPEN, ts=Thu Nov 01 06:42:17 UTC 2012 (269s ago), server=smartdeals-hbase3-snc1.snc1,60020,1351747466016
> bd44334a11464baf85013c97d673e600userTable1,tammikilgore@gmail.com,1351728952308.bd44334a11464baf85013c97d673e600.
state=PENDING_OPEN, ts=Thu Nov 01 06:42:17 UTC 2012 (269s ago), server=smartdeals-hbase1-snc1.snc1,60020,1351751785514
> ed1f7e7908fc232f10d78dd1e796a5d7userTable1,jwoodel@triad.rr.com,1351728971232.ed1f7e7908fc232f10d78dd1e796a5d7.
state=PENDING_OPEN, ts=Thu Nov 01 06:37:37 UTC 2012 (549s ago), server=smartdeals-hbase3-snc1.snc1,60020,1351747466016
>
>
> Note these are not going away even after 30 minutes.
>
> Further after running
>
> hbase hbck -summary I get following:
>
> Summary:
>   -ROOT- is okay.
>     Number of regions: 1
>     Deployed on:  smartdeals-hbase7-snc1.snc1,60020,1351747458782
>   .META. is okay.
>     Number of regions: 1
>     Deployed on:  smartdeals-hbase7-snc1.snc1,60020,1351747458782
>   test1 is okay.
>     Number of regions: 1
>     Deployed on:  smartdeals-hbase2-snc1.snc1,60020,1351747457308
>   userTable1 is okay.
>     Number of regions: 32
>     Deployed on:  smartdeals-hbase10-snc1.snc1,60020,1351747456776 smartdeals-hbase2-snc1.snc1,60020,1351747457308
smartdeals-hbase4-snc1.snc1,60020,1351747455571 smartdeals-hbase5-snc1.snc1,60020,1351747458579
smartdeals-hbase6-snc1.snc1,60020,1351747458186 smartdeals-hbase7-snc1.snc1,60020,1351747458782
smartdeals-hbase8-snc1.snc1,60020,1351747459112 smartdeals-hbase9-snc1.snc1,60020,1351747455106
> 24 inconsistencies detected.
> Status: INCONSISTENT
>
> In master logs I am seeing following error:
>
> ERROR org.apache.hadoop.hbase.master.AssignmentManager: Failed assignment in: smartdeals-hbase3-snc1.snc1,60020,1351747466016
due to
> org.apache.hadoop.hbase.regionserver.RegionAlreadyInTransitionException: Received:OPEN
for the region:userTable1,m_skaare@yahoo.com,1351728968936.bb91fd0c855e60dd4159e0ad3fd52cda.
,which we are already trying to OPEN.
>  at org.apache.hadoop.hbase.regionserver.HRegionServer.checkIfRegionInTransition(HRegionServer.java:2499)
       at   org.apache.hadoop.hbase.regionserver.HRegionServer.openRegion(HRegionServer.java:2457)
       at sun.reflect.GeneratedMethodAccessor24.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.WritableRpcEngine$Server.call(WritableRpcEngine.java:364)
       at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1336)
>
>
> Am I missing something? How do I recover from this? How do I load lot of data via MR
into Hbase Tables?
>
>
> I am running under following setup:
>
> hadoop:2.0.0-cdh4.0.1
>
> hbase: 0.92.1-cdh4.0.1, r
>
>
> Would greatly appreciate any help.
>
>
> Ameya
>
>
>
>

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