We have found that simply leaving a browser tab on the Admin Web UI page appears to cause in increase in memory consumption. If left open long enough, memory consumption can exhaust available system memory, making the node unusable.
The requests seem to correspond to POST /_p/query/query/service request which end up looking like ‘POST /_cbauth HTTP/1.1" 200 36 - Go-http-client/1.1’ in the CB Access logs and large numbers of warnings like ‘[WARN] Finalizing a bucket with active connections’ in the query logs.
Given enough time (for us, about 90 minutes with an instance running at ~90% memory utilization and 16GB system memory under normal conditions).
This looks similar to the post Massive amount of auth POST /_cbauth & [WARN] Finalizing a bucket with active connections
We are using couchbase CE 6.0.0-1693-1 on Ubuntu 16.04.