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From Stack <st...@duboce.net>
Subject Re: Hbase fails to learn about table split
Date Fri, 05 Feb 2010 07:12:10 GMT
2010/2/4 Michał Podsiadłowski <podsiadlowski@gmail.com>:
>> $ ./bin/hadoop fs -get
>> /hbase/filmContributors/1670715971/content/3783592739034234831 .
>>
>> I did this, i've checked if there is this file from web UI and the whole
> dir was missing.
> No wounder because it was deleted after split by node that was hosting
> partent region before split.
>
> 2010-02-03 15:33:35,902 INFO org.apache.hadoop.hdfs.server.
> namenode.FSNamesystem.audit: ugi=mpodsiadlowski,devel, [some privileges]
>       ip=/10.0.100.50 cmd=delete      src=/hbase/filmContributors/1670715971
> dst=null        perm=null
>
> So the order of events was sth like this
>
> 15:32:35, - split of region hosted by 10.0.100.50
> 15:32:37   one of the new regions assigned to 10.0.100.51
> 15.33.35  10.0.100.50 removes whole dir with the file that is causing
> problems

This doesn't seem right.  Its the maser that does the delete of the
parent regions.  It does this after it determines that the daughters
no longer have reference to parent region.   Running in DEBUG and
pasting the master log would help debugging this (Looking in NN log to
see main events regards files and dirs as you did above is another
good means for figuring out stuff).

St.Ack

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