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From "roman.drapeko@baesystems.com" <roman.drap...@baesystems.com>
Subject RE: micro compaction
Date Tue, 09 Jun 2015 16:07:52 GMT
Aggregated output is tiny,  so if I do same calculations in memory (instead of sending mutations
to Accumulo) , I can reduce overall number of mutations by 1000x or so



-----Original Message-----
From: Josh Elser [mailto:josh.elser@gmail.com]
Sent: 09 June 2015 16:54
To: user@accumulo.apache.org
Subject: Re: micro compaction

Well, you win the prize for new terminology. I haven't ever heard the term "micro compaction"
before.

Can you clarify though, you say hundreds of millions of mutations that result in megabytes
of data. Is that an increase or decrease in size.
Comparing apples to oranges :)

roman.drapeko@baesystems.com wrote:
> Hi guys,
>
> While doing pre-analytics we generate hundreds of millions of
> mutations that result in 1-100 megabytes of useful data after major
> compaction. We ingest into Accumulo using MR from Mapper job. We
> identified that performance really degrades while increasing a number of mutations.
>
> The obvious improvement is to do some calculations in-memory before
> sending mutations to Accumulo.
>
> Of course, at the same time we are looking for a solution to minimize
> development effort.
>
> I guess I am asking about micro compaction/ingest-time iterators on
> the client side (before data is sent to Accumulo).
>
> To my understanding, Accumulo does not support them, is it correct?
> And if so, are there any plans to support this functionality in the future?
>
> Thanks
>
> Roman
>
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