How to improve query performance?

Elastic Stack Elasticsearch
1

Hi,
Currently, I use 2 servers(2 shards+1 replica) to query 0.46 billion
documents. The average query response time is 1.5s.
I wish I can simply add a new server into the cluster to improve the
query performance. (still 2 shards + 1 replica)
But after adding a new server into the cluster, I found the query
performance didn't improve much. The average query response time still is
1.5s.
Did I miss anything??
In addition, I'm wondering is there any difference of querying only one
server or query 3 servers roundly?

-Regards-
-Jackie-

2

This really doesn't tell us much of anything

  • What's your HW setup like, is this data in RAM, on disk, what does
    the CPU/disk use etc. look like when you do queries
  • What does your data look like, do you have an example
  • How does the mapping look like
  • How do the queries that you've tried look like
  • Have you tried increasing the number of shards, if you have 2 shards
    in total with X number of replicas and 3 machines you'll only
    distribute your queries to 2 shards, maybe that's your bottleneck, so
    increasing replicas/boxes wouldn't help.
3

Jackie,

It doesn't help to add a new server if no shards/replicas are migrated to
it. Check manually via the API or look at SPM.
Also, by adding more servers you are adding more CPUs, so resharding may
make sense.

Otis

Search Analytics - Cloud Monitoring Tools & Services | Sematext
Scalable Performance Monitoring - Sematext Monitoring | Infrastructure Monitoring Service

On Friday, June 1, 2012 4:01:33 AM UTC-4, jackiedong wrote:

Hi,
Currently, I use 2 servers(2 shards+1 replica) to query 0.46 billion
documents. The average query response time is 1.5s.
I wish I can simply add a new server into the cluster to improve the
query performance. (still 2 shards + 1 replica)
But after adding a new server into the cluster, I found the query
performance didn't improve much. The average query response time still is
1.5s.
Did I miss anything??
In addition, I'm wondering is there any difference of querying only one
server or query 3 servers roundly?

-Regards-
-Jackie-