# Rally and Httperf

**URL:** <https://discuss.elastic.co/t/rally-and-httperf/124457>\
**Category:** Elasticsearch\
**Tags:** rally\
**Created:** [March 18, 2018, 8:18pm UTC](https://discuss.elastic.co/t/rally-and-httperf/124457 "2018-03-18T20:18:32Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![jlwysf](https://avatars.discourse-cdn.com/v4/letter/j/779978/32.png) [@jlwysf](https://discuss.elastic.co/u/jlwysf)\
**Post date:** [March 19, 2018, 4:02pm UTC](https://discuss.elastic.co/t/rally-and-httperf/124457/3 "2018-03-19T16:02:26Z")

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Hi Dimitris,

Thanks for replying me. I still confused about my second and last question and I haven't saw an answer,

- Regarding my second question, if "client" is the concurrent session you referred to, how many thread are related in one client, how can I know? Does one client is one process? If we only have one client , is that mean we only execute one concurrent session?

Regarding my last question,

- According to you [answer](https://discuss.elastic.co/t/about-running-rally-with-error/63284/4), I haven't seen any index called "rally-\*/metrics/" is that because my existing cluster is not provisioned by esrally or they are reside in somewhere else?

- According to this [answer](https://discuss.elastic.co/t/about-running-rally-with-error/63284/4) I have another question regarding how can I know how many indexing thread I have, does indexing thread is python es client you are talking about earlier?

- Basically I try to run esrally against two existing cluster separately, but I only have one coordinate node, whenever I try to run parallel, simply run "pipeline benchmark only" two times with different target hosts, I got "race run error", I'm wondering is there anyway can solve this problem?

Thanks

Eric

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