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From J Mohamed Zahoor <jmo...@gmail.com>
Subject Re: HBase write performance issue
Date Mon, 13 Aug 2012 05:39:25 GMT

Can you see if this helps..



On Mon, Aug 13, 2012 at 10:28 AM, 某因幡 <tewilove@gmail.com> wrote:

> Hi, I'm new to HBase.
> I'm working with Hadoop-1.0.3 and HBase 0.92.1.
> I have 8 data nodes which also work as region servers.
> And I'm trying to import my data into HBase.
> I wrote two programs, one is using HBase client API(auto flush is off,
> WAL is on, multi-threaded) and the other is using HBase MR like the
> Uploader example.
> Row key is a combination of several meaningful fields and a hash in
> the end, about 40 bytes or so.
> Each row is consist of several columns. There is only 2 column
> families. Average raw data of a row is less than 200 bytes.
> The one using client API is about 10,000 rows written per second,
> while the MR one is extremely slow, about 4~5 times slower.
> This is measured after a major compaction.
> Why the writing speed is so slow? Can someone help me.
> --
> language: Chinese, Japanese, English

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