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From Christopher <>
Subject Re: AccumuloOutputFormat and speculative execution
Date Tue, 06 Jan 2015 22:51:33 GMT
The answer is no, they won't be rolled back. And, yes, if you want this
behavior, you either need to make your mutations idempotent or disable
speculative execution.

Christopher L Tubbs II

On Tue, Jan 6, 2015 at 5:43 PM, Russ Weeks <> wrote:

> Hi, all,
> When I use AccumuloOutputFormat in my MR job, I see mutations are written
> to the table before each individual map tasks completes. If speculative
> execution is enabled on my cluster and a map task is killed, will these
> mutations be rolled back? If not, should I explicitly disable speculative
> execution whenever I use AccumuloOutputFormat?
> Or does AccumuloOutputFormat do this internally somehow, and I'm worried
> about nothing?
> Thanks,
> -Russ

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