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Type:
Bug
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Resolution: Incomplete
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Priority:
Minor - P4
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None
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Affects Version/s: 4.2.0
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Component/s: Diagnostics
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None
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ALL
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I created a benchmark that opens lots of connections. I ran this with:
./high_thread_count.lua run --time=720 --rate=3000 --threads=36 --idle-handlers=20 --idle-connections=400000 --csv-file=../../../sysbench.csv --percentile=99 --report-interval=1 --mongo-url='mongodb://username:password@10.2.0.200:27017/admin?replicaSet=rs0&w=3'
The above will open 36 connections that maintain a constant load of 2000 queries/sec and also open about 830 new idle connections per second. For keep-alive purposes the idle connections do a single query each after 300 seconds.
In mongod.log I can see the connections opened at the start of the test:
2019-09-02T15:36:14.137+0000 I NETWORK [listener] connection accepted from 10.2.0.10:50966 #82 (72 connections now open)
2019-09-02T15:36:14.137+0000 I NETWORK [conn82] received client metadata from 10.2.0.10:50966 conn82: { driver: { name: "mongoc", version: "1.14.0" }, os: { type: "Linux", name: "Amazon Linux", version: "2", architecture: "x86_64" }, platform: "cfg=0x2156a0e9 posix=200809 stdc=201112 CC=GCC 7.3.1 20180303 (Red Hat 7.3.1-5) CFLAGS="" LDFLAGS=""" }
2019-09-02T15:36:14.163+0000 I ACCESS [conn82] Successfully authenticated as principal username on admin from client 10.2.0.10:50966
However, in the diagnostic.data only 36 connections are created at that time, and a large increase in connections is only seen 300 s later.
