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From Russ Weeks <rwe...@newbrightidea.com>
Subject Re: AccumuloOutputFormat and speculative execution
Date Tue, 06 Jan 2015 23:14:06 GMT
Good to know. Thanks very much, Christopher and John.
-Russ

On Tue, Jan 6, 2015 at 2:51 PM, Christopher <ctubbsii@apache.org> wrote:

> 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
> http://gravatar.com/ctubbsii
>
> On Tue, Jan 6, 2015 at 5:43 PM, Russ Weeks <rweeks@newbrightidea.com>
> 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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