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Type:
Bug
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Resolution: Unresolved
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Priority:
Major - P3
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None
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Affects Version/s: 4.4.4
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Component/s: Logging
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None
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Server Security
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ALL
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(copied to CRM)
When there is a long $in list the log gets incorrectly truncated losing other fields filter information.
In order to reproduce this problem you can run:
foo=[] N=1620 for (var i = 1; i <= N; i++) { foo.push(i); } db.foo.insert({a:1}) db.foo.createIndex({a:1,b:1}) db.setProfilingLevel(0,-1) db.foo.find({b:1,c:{$in:foo},a:1})
The generated log is something like:
{"t":{"$date":"2021-03-17T20:30:07.212+01:00"},"s":"I", "c":"COMMAND", "id":51803, "ctx":"conn9","msg":"Slow query","attr":{"type":"command","ns":"test.foo","appName":"MongoDB Shell","command":{"find":"foo","filter":{"b":1.0,"c":{"$in":[1.0,.... 1612.0,1613.0,1614.0]}}},"planSummary":"IXSCAN { a: 1, b: 1 }","keysExamined":0,"docsExamined":0,"cursorExhausted":true,"numYields":0,"nreturned":0,"queryHash":"B67CED3E","planCacheKey":"0B3D0365","reslen":97,"locks":{"ReplicationStateTransition":{"acquireCount":{"w":1}},"Global":{"acquireCount":{"r":1}},"Database":{"acquireCount":{"r":1}},"Collection":{"acquireCount":{"r":1}},"Mutex":{"acquireCount":{"r":1}}},"storage":{},"protocol":"op_msg","durationMillis":0},"truncated":{"command":{"filter":{"c":{"$in":{"1614":{"type":"double","size":8}}}}}},"size":{"command":21692}}
As you can notice the filter on "a" is missing from the log, and we only have the filter on "b" and "c" even using an index on "a:1, b:1", making difficult to understand why this specific index was used
- related to
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SERVER-78241 truncated log line shows number of remaining strings instead of truncated strings
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- Closed
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