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  1. Core Server
  2. SERVER-14168

Warning logged when incremental MR collections are unsuccessfully dropped on secondaries

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    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Minor - P4 Minor - P4
    • 2.6.5, 2.7.7
    • Affects Version/s: None
    • Component/s: MapReduce
    • Fully Compatible
    • ALL
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      function createReplSet() {
    var replSet = new ReplSetTest({
        name: 'mapReduceReplSet',
        nodes: 2
    });

    replSet.startSet();
    replSet.initiate();
    replSet.awaitSecondaryNodes();
    return replSet;
}

(function testIncrementalCollectionsAreNotReplicated() {
    var replSet = createReplSet();

    var primaryColl = replSet.getPrimary().getDB('mapReduce').testColl;
    primaryColl.drop();

    // insert some dummy docs
    for (var i = 0; i < 20; i++) {
        primaryColl.insert({foo: i});
    }

    var mapFunction = function() {
        emit(this.foo, 1);
    };
    var reduceFunction = function() {
        return 1;
    };

    // these lines actually trigger the warning
    primaryColl.mapReduce(mapFunction, reduceFunction, {out: 'temp_coll'});
    replSet.awaitReplication();

    replSet.stopSet();
})();
      Show
      function createReplSet() { var replSet = new ReplSetTest({ name: 'mapReduceReplSet', nodes: 2 }); replSet.startSet(); replSet.initiate(); replSet.awaitSecondaryNodes(); return replSet; } (function testIncrementalCollectionsAreNotReplicated() { var replSet = createReplSet(); var primaryColl = replSet.getPrimary().getDB('mapReduce').testColl; primaryColl.drop(); // insert some dummy docs for (var i = 0; i < 20; i++) { primaryColl.insert({foo: i}); } var mapFunction = function() { emit(this.foo, 1); }; var reduceFunction = function() { return 1; }; // these lines actually trigger the warning primaryColl.mapReduce(mapFunction, reduceFunction, {out: 'temp_coll'}); replSet.awaitReplication(); replSet.stopSet(); })();

      The fix for SERVER-13981 purposely allows drop commands for incremental MapReduce collections to be replicated--even though the preceding createCollection commands are not replicated. As a result, a warning like this is logged:

      [repl writer worker 1] warning: repl Failed command { drop: "tmp.mr.testColl_0_inc" } on mapReduce with status UnknownError ns not found during oplog application

      It'd be nice to prevent this (potentially confusing) warning from being triggered and logged.

      Version: 2.6.2-rc0

            Assignee:
            mathias@mongodb.com Mathias Stearn
            Reporter:
            kamran.khan Kamran K.
            Votes:
            1 Vote for this issue
            Watchers:
            4 Start watching this issue

              Created:
              Updated:
              Resolved: