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  1. Core Server
  2. SERVER-16469

findAndModify with sort exceeds internal sort memory limit, silently fails

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    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • 2.8.0-rc3
    • Affects Version/s: None
    • Component/s: Concurrency
    • Labels:
    • Fully Compatible
    • ALL
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      Start up a mongod (with mmapv1 or wiredtiger) and run the following script:

      function insert() {
    // Use 32-bit integer for representing 'length' property
    var doc = { tid: 0, length: new NumberInt(2 * 1024 * 1024 /* 2MB */) };
    doc.field = new Array(doc.length + 1).join('x');

    var res = db.foo.insert(doc);
    assert.writeOK(res);
    assert.eq(1, res.nInserted);
}

function findAndModify() {
    var res = db.runCommand({
        findandmodify: db.foo.getName(),
        query: { tid: 0 },
        sort: { length: 1 }, // NOTE: this seems necessary for the repro
        update: { $mul: { length: 1 } },
        new: true
    });
    assert.commandWorked(res);

    var doc = res.value;
    assert(doc !== null, 'query spec should have matched a document');
}

db.foo.drop();
while (true) {
    insert();
    findAndModify();
}
      Show
      Start up a mongod (with mmapv1 or wiredtiger) and run the following script: function insert() { // Use 32-bit integer for representing 'length' property var doc = { tid: 0, length: new NumberInt(2 * 1024 * 1024 /* 2MB */ ) }; doc.field = new Array(doc.length + 1).join( 'x' ); var res = db.foo.insert(doc); assert .writeOK(res); assert .eq(1, res.nInserted); } function findAndModify() { var res = db.runCommand({ findandmodify: db.foo.getName(), query: { tid: 0 }, sort: { length: 1 }, // NOTE: this seems necessary for the repro update: { $mul: { length: 1 } }, new : true }); assert .commandWorked(res); var doc = res.value; assert (doc !== null , 'query spec should have matched a document' ); } db.foo.drop(); while ( true ) { insert(); findAndModify(); }

      When performing insert operations between findAndModify commands, a findAndModify will eventually fail to find a document to update, even though the query predicate remains the same. This failure only seems to occur when a sort specification is supplied.

      git version
      a6788ec72a9dabb38bd92a8ab653e32034e9e02e

            Assignee:
            rassi J Rassi
            Reporter:
            max.hirschhorn@mongodb.com Max Hirschhorn
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              Created:
              Updated:
              Resolved: