A metrics to see reads/writes per shard elastic search

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Using elasticsearch - 6.1.1 We have we have 650TB data, 9000+ shards avg write TPS - 1300 per second avg read TPS - 2500 per second

Questions

  1. Can I introduce a new metric to see number of reads & writes per shard & per host. This is to track hot shards in our cluster. Currently I don't an option to add this.?

  2. For reads is it right to assume that read goes to all the shards if we don't give the key, searches on an indexed field.

Thanks Nisar

elasticsearch
1 Answers

With the following command you can get the read/write metrics per index/shard. it also gives you information about the active threads:

GET _nodes/stats?level=shards&filter_path=**.indices.**.*current,**.name,**.thread_pool.*.active

Regarding your second question, without routing, ES will pick a set of shards (primary and/or replicas) that are most likely to answer promptly, it's called adaptive replica selection.

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