Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Threaded View
HBase >> mail # user >> Root Region is not online


Copy link to this message
-
Re: Root Region is not online
That['s right…
Make sure you have zookeeper running correctly and then  try to restart HBase.
Try to use "hbase hbck -fix" to fix the potential problems.
Also, habse master log and hbase regionserver log may have good pointers to the root of the problem.

Thank you!

Sincerely,
Leonid Fedotov
Technical Support Engineer
[EMAIL PROTECTED]
office: +1 855 846 7866 ext 292
mobile: +1 650 430 1673
On Mar 8, 2013, at 9:25 AM, rajesh babu chintaguntla wrote:

> Hi Charan,
>
> Its may be because of some zookeeper issues (like session timeout) while
> splitting hlog.
> The problem could be https://issues.apache.org/jira/browse/HBASE-7034
> Its recently fixed in 0.94 version as well.
>
> Thanks,
> Rajesh
>
>
> On Fri, Mar 1, 2013 at 2:03 PM, charan raj <[EMAIL PROTECTED]> wrote:
>
>> hi,
>>
>> I am currently using a 5 node cluster configured in amazon.The namenode
>> and secondary namenode or in different node. I have shut down the cluster
>> in amazon instance directly without shuting down hbase and hadoop,But when
>> i started the amazon instance, here is the problem am facing with hbase am
>> not able to scan the data present in hbase table and below are the error
>> that is generated with hbck,masterlog and zookeeper log.
>>
>>         hbase/logs masterlog
>> ==================>> error while splitting logs in
>>
>> [hdfs://servername:9000/hbase/.logs/servername,60020,1358343873518-splitting,
>>
>> hdfs://servername:9000/hbase/.logs/servername,60020,1361892283588-splitting,
>>
>> hdfs://servername:9000/hbase/.logs/servername,60020,1358343874434-splitting,
>>
>> hdfs://servername:9000/hbase/.logs/servername,60020,1361892283510-splitting,
>>
>> hdfs://servername:9000/hbase/.logs/servername,60020,1358343873830-splitting,
>>
>> hdfs://servername:9000/hbase/.logs/servername,60020,1361892283643-splitting]
>> installed = 1 but only 0 done
>> Task = installed = 1 done = 0 error = 1
>>        at
>>
>> org.apache.hadoop.hbase.master.SplitLogManager.splitLogDistributed(SplitLogManager.java:268)
>>        at
>>
>> org.apache.hadoop.hbase.master.MasterFileSystem.splitLog(MasterFileSystem.java:279)
>>        at
>>
>> org.apache.hadoop.hbase.master.MasterFileSystem.splitLogAfterStartup(MasterFileSystem.java:219)
>>        at
>>
>> org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:497)
>>        at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:336)
>>        at java.lang.Thread.run(Thread.java:722)
>>
>> hbase/logs zookeeper log
>> ========================>> 2013-03-01 07:12:53,000 INFO
>> org.apache.zookeeper.server.PrepRequestProcessor: Got user-level
>> KeeperException when processing sessionid:0x13d214fae680005 type:setData
>> cxid:0x1c6f zxid:0x49ac txntype:-1 reqpath:n/a Error
>>
>> Path:/hbase/splitlog/hdfs%3A%2F%2Fservername%3A9000%2Fhbase%2F.logs%2Fservername%2C60020%2C1358343873830-splitting%2Fservername%252C60020%252C1358343873830.1360329708655
>> Error:KeeperErrorCode = BadVersion for
>>
>> /hbase/splitlog/hdfs%3A%2F%2Fservername%3A9000%2Fhbase%2F.logs%2Fservername%2C60020%2C1358343873830-splitting%2Fservername%252C60020%252C1358343873830.1360329708655
>>
>> bin/hbase hbck error
>> ==================>> Version: 0.92.1
>> 13/03/01 07:15:17 DEBUG
>> client.HConnectionManager$HConnectionImplementation: Lookedup root region
>> location,
>>
>> connection=org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@58c9defc
>> ;
>> serverName>> ERROR: Root Region or some of its attributes are null.
>> ERROR: Encountered fatal error. Exiting...
>>
>>
>>
>> I tried hbck -fix and other options which will repair meta but it is of no
>> use,can any one help me in solving this issue...........
>>
>> Regards,
>> Charan
>>

NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB