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HBase >> mail # user >> Scanner returning keys out of order


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Jan Lukavský 2013-05-17, 13:40
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Jean-Marc Spaggiari 2013-05-17, 13:44
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Re: Scanner returning keys out of order
Hi JM,

thanks for reply, we will upgrade and check if the problem goes away.

Cheers,
  Jan

On 17.5.2013 15:44, Jean-Marc Spaggiari wrote:
> Hi Jan,
>
> 0.90.6 is a very old version of HBase... Will you have a chance to migrate
> to a more recent one? Most of your issues might probably be already fixed.
>
> JM
>
> 2013/5/17 Jan Lukavský <[EMAIL PROTECTED]>
>
>> Hi all,
>>
>> we are seeing very strange behavior of HBase (version 0.90.6-cdh3u5) in
>> the following scenario:
>>
>>   1) Open scanner and start scanning.
>>   2) Check order of returned keys (simple test if next key is
>> lexigraphically greater than the previous one).
>>   3) The check may occasionally fail.
>>
>> When we investigated this a bit, we saw major compaction occurring on the
>> scanned region precisely in the time of the check failure. Interesting is
>> that the compaction occurred on a column family that was not actually
>> involved in the scanning. Has anyone else seen this? Is it possible that
>> this is fixed in any higher version of HBase?
>>
>> Thanks,
>>   Jan
>>
>>
>>