CODEWITHSUNDEEP
couchbase
Virender Dubey
Virender Dubey

Reputation: 206

couchbase nodes RAM is getting full frequently

we have a 4 node cluster, with 24 GB RAM, out of which 18GB has been given to couchbase with zero replicaion. We have a approx 10M of records in this cluster with ~2.5M/hour and expire old items. My RAM Usage which is ~72GB is getting full every ~12 days, and i need to restart the cluster to fix this. After restart again the RAM usage is back to ~20GB.

Can someone please help to understand the reason for it.

FYI : Auto Compaction is set to 40% fragment level and Meta Data Purge Interval is set to 1 Day, -- which we reduced to do 2 hours. But it didn't help.

Upvotes: 1

Views: 723

Answers (1)

David Ostrovsky
David Ostrovsky

Reputation: 2481

Under scenarios with very high memory allocation churn Couchbase can experience memory fragmentation, which would cause the effects you are describing. This was addressed in the 4.x release by switching to jemalloc on non-Windows OSes and using tcmalloc with agressive decommit on Windows. I would suggest you download the RC version of Couchbase 4 (http://www.couchbase.com/nosql-databases/downloads#Couchbase_Server) and give it a try to see if that fixes the issue.

Upvotes: 1

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