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From Vidhyashankar Venkataraman <vidhy...@yahoo-inc.com>
Subject Unable to contact Regionserver in spite of META entry...
Date Thu, 29 Jul 2010 19:31:05 GMT
I have an MR job that sends streams of updates (puts and deletes) to an existing db and all
the tasks are crashing complaining of the exceptions similar to the following:

   Exception in thread "main" org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying
to contact region server Some server, retryOnlyOne=true, index=0, islastrow=false, tries=9,
numtries=10, i=78, listsize=390, region=DocData,0000001013071992,1279835733117 for region
DocData,0000001013071992,1279835733117, row '0000001013115520', but failed after 10 attempts.

I ran this job on 180 nodes with a max of 6 tasks per node; I thought this was possibly due
to overload so I ran it with just 2 tasks per node but again got similar exceptions..

Then I tried issuing a put on the hbase shell: And it complained of the same issue..

I checked the meta table entry and it seems fine.. I checked the corresponding region server
(web ui) and it is indeed hosting the region.

DocData,0000001013071992,12 column=info:regioninfo, timestamp=1280305164242, value=REGION
=> {NAME => 'DocDat
 79835733117                 a,0000001013071992,1279835733117', STARTKEY => '0000001013071992',
ENDKEY => '000
                             0001013205991', ENCODED => 1962005300, TABLE => {{NAME
=> 'DocData', MAX_FILESIZE
                              => '4402341480', FAMILIES => [{NAME => 'bigColumn',
                              => 'NONE', TTL => '2147483647', BLOCKSIZE => '1048576',
IN_MEMORY => 'false', BL
                             OCKCACHE => 'false'}]}}
 DocData,0000001013071992,12 column=info:server, timestamp=1280317959911, value=
 DocData,0000001013071992,12 column=info:serverstartcode, timestamp=1280317959911, value=1279926520261

Can you see what is wrong here?

Thank you

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