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  1. Documentation
  2. DOCS-14762

Investigate changes in SERVER-53859: Add queryHash to the mongos slow query logs

      Downstream Change Summary

      This change adds a "queryHash" to the slow log lines to help users diagnose slow queries. It may potentially affect scripts which parse the slow query log line.

      Description of Linked Ticket

      `queryHash` field introduced in slow query logs in v4.2 is available only in `mongod` logs and not in `mongos` logs. The documentation does not have any mention of relevant behaviour. Is this expected or requires any configuration change? 

      Sample mongos slow query log:

      {"t":{"$date":"2020-12-31T02:19:33.680+00:00"},"s":"I",  "c":"COMMAND",  "id":51803,   "ctx":"conn128","msg":"Slow query","attr":{"type":"command","ns":"xxxx.companyPriority","command":{"find":"companyPriority","filter":{"_id":{"$in":[{"$oid":"5319df10e4b0f7e16602a313"}]}},"$db":"xxxx","$clusterTime":{"clusterTime":{"$timestamp":{"t":1609381171,"i":2}},"signature":{"hash":{"$binary":{"base64":"C2cNRe4vAhiBs97T6VYXIYYU1Ck=","subType":"0"}},"keyId":6877905033757720578}},"lsid":{"id":{"$uuid":"ba72a15f-2568-43e9-8c9a-abd7bd2aa6be"}}},"nShards":1,"cursorExhausted":true,"numYields":0,"nreturned":1,"reslen":278,"protocol":"op_msg","durationMillis":2007}}
      

            Assignee:
            jeffrey.allen@mongodb.com Jeffrey Allen
            Reporter:
            backlog-server-pm Backlog - Core Eng Program Management Team
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              Created:
              Updated:
              Resolved:
              2 years, 38 weeks ago