mongodb - Why does my Google Compute Engine instance make Mongo return incorrect results? -


on google compute debian instance, 2 concurrent mongo findoneandupdate in mongo shell make second 1 return null, though there plenty items left process. not happen on other hardware (like macbook pro on macos sierra) using same database , version numbers.

what makes difference:

  • removing sort; either because problem goes away, or because query fast chances of collision small.
  • as said; running same mongodb version on different hardware/os (don't have access debian jessie on own hardware).

what not make difference: adding/removing indices, returnoriginal.

background info:

  • google compute engine n1-highmem-2 (2 vcpus, 13 gb memory) instance
  • running debian jessie
  • mongodb version 3.4.3

the collection contains 1.8 million records. here's query ; names have been changed protect innocent:

db.mycollection.findoneandupdate(     {     "foo" : { "$exists" : 1 },     "baz.pid" : { "$exists" : 0 },     "$or" : [       { "baz.completed" : { "$exists" : 0 } },       { "baz.completed" : { "$lt" : isodate("2017-03-07t19:02:35.422z") } }     ]   },   { $set: { baz: { started: new date(), pid: 42 } } },   { sort: { prio: -1 }, returnoriginal: false } );


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