Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Plain View
HBase >> mail # user >> Scanner returning keys out of order

Jan Lukavský 2013-05-17, 13:40
Copy link to this message
Re: Scanner returning keys out of order
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.


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
Jan Lukavský 2013-05-20, 07:58