Each shard is queried in parallel. But if you don't have enough threads to query multiple shards at once, then it's not the strict definition of parallel as it has to context switch.
On 30 January 2015 at 11:05, Kevin Burton <[email protected]> wrote: > Ha. I appreciate the feedback but this doesn't answer my question. > > Does it query them sequentially or in parallel. > > Using parallel dispatch can dramatically improve performance so I'm trying > to track down how this works. > > and I'm aware that the documentation was there, but I couldn't find > anything where it explains how the client executes requests. > > I might just have to dive into the source or get on the dev list. > > On Thursday, January 29, 2015 at 1:58:41 PM UTC-8, Mark Walkom wrote: >> >> ES queries each applicable shard when processing a query. The docs are >> here - http://www.elasticsearch.org/guide/en/elasticsearch/ >> reference/current/index.html >> >> A lot of your problem depends on your setup. Can you give us an overview >> of your setup, both infra and data structure? >> >> On 30 January 2015 at 07:57, Kevin Burton <[email protected]> wrote: >> >>> I can't RTFM on this because I can't find the documentation. >>> >>> It looks like some of our queries are taking about 1 second per index >>> shard per index. >>> >>> However, the drives are still have low utilization. Around 10% ... so >>> I'm trying to figure out how to improve performance. My hunch is that I >>> can get ES to do parallel dispatch so that it can execute more queries in >>> parallel which the SSDs we're using should be able to handle. >>> >>> -- >>> 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/d7088d0d-15fa-4925-a16e-fd7152bfccf1% >>> 40googlegroups.com >>> <https://groups.google.com/d/msgid/elasticsearch/d7088d0d-15fa-4925-a16e-fd7152bfccf1%40googlegroups.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/716f62f0-afe5-4221-a252-b57ad7bf296a%40googlegroups.com > <https://groups.google.com/d/msgid/elasticsearch/716f62f0-afe5-4221-a252-b57ad7bf296a%40googlegroups.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/CAEYi1X_b%2BCiyViWWzScuryad5TfjOK0NO3h3K2Sn0GYXAZmUrQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
