MongoC client disconnect error from server

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arun muralidharan

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May 4, 2018, 8:57:25 AM5/4/18

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OS: Ubuntu 16

Mongo C driver version : 1.3.1-1 amd64

Mongo DB server version : 3.6.3

I am seeing below logs after enabling certain debug logs:

2018-05-04T11:39:26.995Z D COMMAND [conn4] run command admin.$cmd { isMaster: 1, $readPreference: { mode: "secondaryPreferred" }, $db: "admin" }

2018-05-04T11:39:26.995Z D NETWORK [conn4] Starting server-side compression negotiation

2018-05-04T11:39:26.995Z D NETWORK [conn4] Compression negotiation not requested by client

2018-05-04T11:39:26.996Z I COMMAND [conn4] command admin.$cmd command: isMaster { isMaster: 1, $readPreference: { mode: "secondaryPreferred" }, $db: "admin" } numYields:0 reslen:223 locks:{} protocol:op_query 0ms

2018-05-04T11:39:26.996Z D NETWORK [conn4] Session from 127.0.0.1:46516 encountered a network error during SourceMessage

2018-05-04T11:39:26.996Z I NETWORK [conn4] end connection 127.0.0.1:46516 (1 connection now open)

So, the last log pasted above says that it disconnected the client. But I am unable to figure out what exactly caused the disconnection.

Any idea folks ?

Thanks in advance!

Wan Bachtiar

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Jun 5, 2018, 3:47:12 AM6/5/18

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So, the last log pasted above says that it disconnected the client. But I am unable to figure out what exactly caused the disconnection.

Hi Arun,

It’s been a while since you posted this question, have you found a solution yet ?

Based on error message, it’s likely to come from the server code service_state_machine.cppL308. Seems to be caused by network error or interruption.

Is it constantly reproducible ? If so, do you have a minimal working script to reproduce the issue ?

See also related ticket SERVER-34621. Please feel free to watch/upvote to receive updates.