What is this query like? if it does sorting or faceting for example this could be the field data being invalidated and loaded again, and this will point at low levels of free RAM. Phrase queries require loading term position data that is also being cached but can get invalidated. Etc etc
Also, this new feature may be worth having a look at https://github.com/elasticsearch/elasticsearch/blob/master/docs/reference/indices/benchmark.asciidoc -- Itamar Syn-Hershko http://code972.com | @synhershko <https://twitter.com/synhershko> Freelance Developer & Consultant Author of RavenDB in Action <http://manning.com/synhershko/> On Fri, Apr 11, 2014 at 2:24 PM, Nikolas Everett <[email protected]> wrote: > 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 > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elasticsearch/CAPmjWd2hR-CDOsOy-o1Opqc8V6GWJ5Z_qRxAOsi2yrc_5RGBmQ%40mail.gmail.com<https://groups.google.com/d/msgid/elasticsearch/CAPmjWd2hR-CDOsOy-o1Opqc8V6GWJ5Z_qRxAOsi2yrc_5RGBmQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zvw1Nnuvh_B%3DkGm_4K7Rs97CgSOqzB3DFX1j1gz%2Bajg%3Dw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
