what is "killcursors: found 0 of 1" from mongodb.log with replicaset?

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                          This is output of mloginfo log --distinct. What does killcursors mean exactly and what's the DBA action? We use latest mongod in a 3 node replicaset.

With a search engine i found only on mongodb-user mailing list

> Killcursors is a database command that removes cursor references on
> the server. It's normal and harmless. You'll probably only get an
> exception when inserting in safe mode.

I wish more info.

        source: mongodb.log
           host: example
          start: 2016 Jul 15 07:35:28.419
            end: 2016 Aug 19 08:00:15.874
    date format: iso8601-local
         length: 244025
         binary: mongod
        version: 3.2.8
        storage: wiredTiger
    
    DISTINCT
                                                                                              
       64062    connection accepted from ... # ... ( ... now open)
       63984    end connection ... ( ... now open)
           4    killcursors: found ... of
           3    assertion ... ns: ... query:
           1    git version:
           1    waiting for connections on port

Logs

    2016-08-05T15:29:36.935+0200 I COMMAND  [conn39339] killcursors: found 0 of 1
    2016-08-05T15:29:36.937+0200 I COMMAND  [conn39327] killcursors: found 0 of 1
    2016-08-05T15:29:36.945+0200 I COMMAND  [conn39329] killcursors: found 0 of 1
    2016-08-05T15:29:36.946+0200 I COMMAND  [conn39343] killcursors: found 0 of 1
                        

Asked by Sybil (2578 rep)

Aug 19, 2016, 07:04 AM
Last activity: Aug 20, 2016, 09:37 AM

what is "killcursors: found 0 of 1" from mongodb.log with replicaset?

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