Improve ElasticSearch Read Cache


(Strfx) #1

Hi there

I'm doing heavy bulk updating on my elasticsearch cluster on a daily base. While is usually works fine on a fresh index (50k updates/sec), after a few bulks the process slows down terribly (1-5k updates/sec). Investigation shows that Elasticsearch keeps hitting the disk for reads (~1'200 K/s reads per process) - I guess it is checking for the existence of the document to be updated.

Is there a way to improve the read cache, so it doesn't has to hit the disk so frequent?

Specs:
24 cores, 36 GB RAM (24GB Heap Size, so 12GB are left for the OS disk cache)


(Mark Walkom) #2

Move to SSDs would be one :slight_smile:


(Otis Gospodnetić) #3

Hi,

Maybe you can make your heap a little smaller and give the OS a bit more RAM and see if that makes a difference?

Otis

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(system) #4