Number of shards per host


(Abhijith Reddy) #1

How does one decide the number of hosts ? I understand the answer for such questions is always "It Depends" but is there a strategy to that I can use to determine this number ? I went through this document - https://www.elastic.co/guide/en/elasticsearch/guide/current/capacity-planning.html and it recommends to do a test to determine the number of primary shards (index size / max shard size once I have the number what would be a good way to find the number of shards that can be distributed to a host ? Ideally 1 shard per host would be great but that doesn't seem reasonable given my index size. I presume the performance won't be the same when multiple shards are located on a machine. Any pointers would be helpful.


(Mark Walkom) #2

How big is your index size?


(Abhijith Reddy) #3

Index size is around 1.5 TB, we have around 4B documents with 200 shards. We have 10 data nodes and 3 master nodes. Each data node has 48 cores, 144GB of ram with SSD.


(Mark Walkom) #4

So 7.5Gb per shard?
I'd increase that a fair bit, maybe by 5 times.


(system) #5