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Operating System:
ALL
Steps To Reproduce:
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From the Shell using 3.0.0-rc8

// Create 10000 collections. > for (var i =0; i < 10000; ++i ) db.getCollection( "test_" + i ).insert({}); WriteResult({ "nInserted" : 1 }) // Time and run the listCollections command. > var start = new Date().getTime(); db.runCommand({"listCollections" : 1, maxTimeMS : 1}); print(new Date().getTime() - start); 9711
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From the Shell using 3.0.0-rc8 // Create 10000 collections. > for ( var i =0; i < 10000; ++i ) db.getCollection( "test_" + i ).insert({}); WriteResult({ "nInserted" : 1 }) // Time and run the listCollections command. > var start = new Date().getTime(); db.runCommand({ "listCollections" : 1, maxTimeMS : 1}); print( new Date().getTime() - start); 9711
Sprint:
Storage NYC 2018-06-18

The listCollections command accepts the maxTimeMS option but does not enforce the timeout.

This is a regression from the 2.6.X model which performed a query on the system.namespaces collection which does enforce the timeout.

Note that the server does imply that the command supports the maxTimeMS with the following error message:

> db.runCommand({"listCollections" : 1, $maxTimeMS : 1}); 
{
	"ok" : 0,
	"errmsg" : "no such command option $maxTimeMS; use maxTimeMS instead"
}