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HBase, mail # user - Re: Extremely slow when loading small amount of data from HBase


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n keywal 2012-09-05, 11:04
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Re: Extremely slow when loading small amount of data from HBase
Jean-Marc Spaggiari 2012-09-05, 12:06
But I think you should also look at why we have so many regions...
Because even if you merge them manually now, you might face the same
issu soon.

2012/9/5, n keywal <[EMAIL PROTECTED]>:
> Hi,
>
> With 8 regionservers, yes, you can. Target a few hundreds by default imho.
>
> N.
>
> On Wed, Sep 5, 2012 at 4:55 AM, 某因幡 <[EMAIL PROTECTED]> wrote:
>
>> +HBase users.
>>
>>
>> ---------- Forwarded message ----------
>> From: Dmitriy Ryaboy <[EMAIL PROTECTED]>
>> Date: 2012/9/4
>> Subject: Re: Extremely slow when loading small amount of data from HBase
>> To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
>>
>>
>> I think the hbase folks recommend something like 40 regions per node
>> per table, but I might be misremembering something. Have you tried
>> emailing the hbase users list?
>>
>> On Sep 4, 2012, at 3:39 AM, 某因幡 <[EMAIL PROTECTED]> wrote:
>>
>> > After merging ~8000 regions to ~4000 on an 8-node cluster the things
>> > is getting better.
>> > Should I continue merging?
>> >
>> >
>> > 2012/8/29 Dmitriy Ryaboy <[EMAIL PROTECTED]>:
>> >> Can you try the same scans with a regular hbase mapreduce job? If you
>> see the same problem, it's an hbase issue. Otherwise, we need to see the
>> script and some facts about your table (how many regions, how many rows,
>> how big a cluster, is the small range all on one region server, etc)
>> >>
>> >> On Aug 27, 2012, at 11:49 PM, 某因幡 <[EMAIL PROTECTED]> wrote:
>> >>
>> >>> When I load a range of data from HBase simply using row key range in
>> >>> HBaseStorageHandler, I find that the speed is acceptable when I'm
>> >>> trying to load some tens of millions rows or more, while the only map
>> >>> ends up in a timeout when it's some thousands of rows.
>> >>> What is going wrong here? Tried both Pig-0.9.2 and Pig-0.10.0.
>> >>>
>> >>>
>> >>> --
>> >>> language: Chinese, Japanese, English
>> >
>> >
>> >
>> > --
>> > language: Chinese, Japanese, English
>>
>>
>> --
>> language: Chinese, Japanese, English
>>
>
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某因幡 2012-09-06, 03:17
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Doug Meil 2012-09-05, 14:37