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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Performance become slower and slower during inserting
Date Thu, 19 Mar 2009 13:07:40 GMT
How many tasks that are writing into HBase are being spawn? One thing
that sure explains some slow down is the fact that your HBase clients
must build up their META cache, which requires lookups in the META
table.

J-D

On Thu, Mar 19, 2009 at 1:54 AM, schubert zhang <zsongbo@gmail.com> wrote:
> I am testing the performance of HBase, after about one weeks's test.
> I found the HBase become more and more slow when inserting data.
>
> (3 regionserver, HBase 0.19.1 and hadoop 0.19.2)
>
> Each row have about 32 column (in one family), the row have about 400 bytes
> raw data.
>
> For example:
> 1. when there are only 10-32 regions, the inserting time about 550000 rows
> is about 3-4 minutes.
> 2. when there are about 64 regions, the inserting time about 550000 rows is
> about 6-10 minutes.
> 3. and then more than 10 minutes.
> .....
>
> Schubert
>

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