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From David Medinets <david.medin...@gmail.com>
Subject Re: tserver.mutation.queue.max default in 1.5
Date Wed, 23 Jul 2014 22:12:37 GMT
How does that impact memory usage? Is there some other setting that
needs to be adjusted at the same time?

On Wed, Jul 23, 2014 at 4:36 PM, Josh Elser <josh.elser@gmail.com> wrote:
> I started running some tests against 1.5.2 today and was baffled for a few
> hours with horrid ingest performance (~30% of what I expected).
>
> After staring at configs for a while, I finally realized it was because I
> didn't increase tserver.mutation.queue.max from the default of 256k. Sure
> enough, this resulted in speeds that I expected.
>
> I see that in 1.6.0, the default value for this was increase from 256K to 1M
> (in ACCUMULO-1905). I know we have it written down in the release notes, but
> I think the likelihood of causing terrible performance for users is much
> greater than causing OOMEs (or similar increased memory footprint) problems
> for users. I would like to change the default for 1.5.2 to 1M to match
> 1.6.0.
>
> Thoughts/worries/complaints?

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