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HBase, mail # user - Question about the time to execute joins in HBase!


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Re: Question about the time to execute joins in HBase!
Michael Segel 2013-08-22, 15:46
You kind of have two threads along the same lines.

See my response in your other thread...

On Aug 22, 2013, at 10:41 AM, Pavan Sudheendra <[EMAIL PROTECTED]> wrote:

> scan.setCaching(500);
>
> I really don't understand this purpose though..
>
>
> On Thu, Aug 22, 2013 at 9:09 PM, Kevin O'dell <[EMAIL PROTECTED]>wrote:
>
>> QQ what is your caching set to?
>> On Aug 22, 2013 11:25 AM, "Pavan Sudheendra" <[EMAIL PROTECTED]> wrote:
>>
>>> Hi all,
>>>
>>> A serious question.. I know this isn't one of the best hbase practices
>> but
>>> I really want to know..
>>>
>>> I am doing a join across 3 table in hbase.. One table contain 19m
>> records,
>>> one contains 2m and another contains 1m records.
>>>
>>> I'm doing this inside the mapper function.. I know this can be done with
>>> pig and hive etc. Leaving the specifics out, how long would experts think
>>> it would take for the mapper to finish aggregating them across a 6 node
>>> cluster.. One is the job tracker and 5 are task trackers.. By the time I
>>> see the map reduce job status for input records reach 600,000 it's taking
>>> an hour.. It can't be right..
>>>
>>> Any tips? Please help.
>>>
>>> Thanks.
>>>
>>> --
>>> Regards-
>>> Pavan
>>>
>>
>
>
>
> --
> Regards-
> Pavan

The opinions expressed here are mine, while they may reflect a cognitive thought, that is purely accidental.
Use at your own risk.
Michael Segel
michael_segel (AT) hotmail.com