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From Stack <st...@duboce.net>
Subject Re: Speeding up LoadIncrementalHFiles?
Date Thu, 31 Mar 2011 03:39:08 GMT
What is slow?  The running of the LoadIncrementHFiles or the copy?  If
the former, is it because the table its loading into has different
boundaries than those of the HFiles so the HFiles have to be split?

Is your data only coming in via bulk load?


On Wed, Mar 30, 2011 at 6:32 PM, Adam Phelps <amp@opendns.com> wrote:
> Does anyone have any suggestions for speeding up LoadIncrementalHFiles?
> We have M/R jobs that directly generate HFiles and are then loaded into
> HBase via LoadIncrementalHFiles.  We're attempting to maintain a backup of
> our production HBase on a backup Hadoop cluster by copying the HFiles there
> and then loading them there.
> The problem we're running into is that we want the backup cluster to use a
> good number fewer nodes than the primary cluster, however despite having a
> pretty low load (CPU, disk IO, etc) it isn't keeping up well. We'd rather
> not dedicate more nodes from the overall pool to this purpose if at all
> possible.  Are there any settings that can be adjusted to improve the
> performance of the bulk load?
> Alternate suggestions for maintaining an HBase backup would also be of
> interest.
> - Adam

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