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[Tobias <question676015@xxxxxxxxxxxxxxxxxxxxx>]

New question #676015 on Graphite:
https://answers.launchpad.net/graphite/+question/676015

Hi,

I am running a graphite cluster with one frontend reading from two backends with the CLUSTER_SERVERS:

MEMCACHE_HOSTS = ['graphite-frontend-a:11211','graphite-frontend-b:11211']
DEFAULT_CACHE_DURATION = 60
DEFAULT_CACHE_POLICY = [(0, 60), # default is 60 seconds
                        (7200, 120), # >= 2 hour queries are cached 2 minutes
                        (21600, 180), # >= 6 hour queries are cached 3 minutes
                        (43200, 360), # >= 12 hour queries are cached 6 minutes
                        (86400, 600)] # >= 24 hour queries are cached 10 minutes

REMOTE_FIND_TIMEOUT = 60 # Timeout for metric find requests
REMOTE_FETCH_TIMEOUT = 60 # Timeout to fetch series data
CLUSTER_SERVERS = ["graphite-backend-a-1:80", "graphite-backend-a-2:80"]
REMOTE_PREFETCH_DATA = True


The write throughput is really good for this cluster (using carbon-c-relay) but the queries tend to get slow during peak hours and sometimes even timing out.

The frontend machine has:
8GB memory
2 x Intel(R) Xeon(R) CPU E5-2686 v4 @ 2.30GHz 

The backend machines (i3 instances) have:
32 GB memory
4 x Intel(R) Xeon(R) CPU E5-2686 v4 @ 2.30GHz 
dedicated SSD disk

Do you have any tips on how I could change the settings to make it faster?

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