Itamar:
Its really just a match query. No sorting or anything:
POST /enwiki_content/_search
{
"_source": false,
"query": {
"multi_match": {
"query": "main page",
"fields": [
"title.plain"
]
}
}
}
I mean, I do more complicated things most of the time, but I'm still able
to reproduce the fluctuations with the match query.
David:
I never turned on warmers or any eager loading. I'll give that a shot and
report back.
Nik
On Fri, Apr 11, 2014 at 10:02 AM, David Pilato <[email protected]> wrote:
> Could this be caused by Lucene merges at some point? I guess also that
> when a segment is commited, it could take some time to compute cache for
> new segments?
>
> Are you using warmers?
>
> --
> David ;-)
> Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs
>
> Le 11 avr. 2014 à 15:24, Nikolas Everett <[email protected]> a écrit :
>
> When I repeat the same search over and over again I get somewhat wild
> fluctuations in run time: 4ms, 4ms, 87ms, 17ms, 157ms, 4ms, 4ms, 4ms
>
> Any ideas what might cause this? This only seems to happen on my
> production cluster so I'm not likely to be able to make full reproduction
> steps. I causing it with a simple match query without any filters or
> anything.
>
> Normally I trace performance stuff by causing lots of traffic and looking
> at hot_threads but that these fluctuations don't feel like they'd be easy
> to catch that way.
>
> I have 16 nodes on real hardware with somewhat slow disks and 30GB heaps
> with 96GB total ram. We write to the indexes constantly but slowly. Maybe
> 2-3 updates (not new docs, changes to old docs) per second per shard.
>
> Any ideas would be great,
>
> Thanks
>
> Nik
>
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