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From Christopher <>
Subject Re: Design-for-comment: Accumulo Server-Side Computation: Stored Procedure Tables starring SpGEMM
Date Thu, 26 Feb 2015 19:34:28 GMT
Hi Dylan,

It's a clever way to leverage existing Accumulo behaviors (full major
compaction) to act as clients in order to perform a parallel operation to
populate a new table. Have you tried this method in practice at all, yet?
What pitfalls have you run into, perhaps regarding client-side static state
in the JVM, or resource management issues within the tablet servers? What
do you think the similarities and differences are with other parallel
execution methods that one could use to achieve the same results (like

Also, do you have any code available for an example RemoteSourceIterator,
which we might be able to try? The Transpose one seemed simple enough, but
any others would be neat to try, also.

Do you have any thoughts on whether there should be some abstract base
class available in Accumulo (vs. as part of the contrib) to support these
iterators and handle the boiler-plate stuff of setting up/serializing the
client configuration when the procedure executes, or utilities to help
create a stored procedure table?

Christopher L Tubbs II

On Thu, Feb 26, 2015 at 12:42 AM, Dylan Hutchison <> wrote:

> Hello all,
> As promised
> <>,
> here is a design doc open for comments on implementing server-side
> computation in Accumulo.
> Would love to hear your opinion, especially if the proposed design pattern
> matches one of *your use cases*.
> Regards,
> Dylan Hutchison

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