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HBase, mail # user - Table in Inconsistent State; Perpetually pending region server transitions while loading lot of data into Hbase via MR


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Re: Table in Inconsistent State; Perpetually pending region server transitions while loading lot of data into Hbase via MR
Cheng Su 2012-11-01, 08:19
I met same problem these days.
I'm not very sure the error log is exactly same, but I do have the
same exception

org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException:
Failed 1 action: NotServingRegionException: 1 time, servers with
issues: smartdeals-hbase8-snc1.snc1:60020,

and the table is also neither enabled nor disabled, thus I can't drop it.

I guess the problem is the total store size.
How many region server do you have?
Since you set the max file size to 2G, you can only store 2XN G data
into a single CF.
(N is the number of your region servers)

You might want to increase the max file size or region servers.

On Thu, Nov 1, 2012 at 3:29 PM, Ameya Kantikar <[EMAIL PROTECTED]> wrote:
> 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 <[EMAIL PROTECTED]> 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,[EMAIL PROTECTED],1351728961461.8dcb3edee4e43faa3dbeac2db4f12274. state=PENDING_OPEN, ts=Thu Nov 01 06:39:57 UTC 2012 (409s ago), server=smartdeals-hbase1-snc1.snc1,60020,1351751785514
>>
>>
>> bb91fd0c855e60dd4159e0ad3fd52cdauserTable1,[EMAIL PROTECTED],1351728968936.bb91fd0c855e60dd4159e0ad3fd52cda. state=PENDING_OPEN, ts=Thu Nov 01 06:42:17 UTC 2012 (269s ago), server=smartdeals-hbase3-snc1.snc1,60020,1351747466016
Regards,
Cheng Su