mongodb/jstests/replsets/lastop.js

// Test that lastOp is updated properly in the face of no-op writes and for writes that generate
// errors based on the preexisting data (e.g. duplicate key errors, but not parse errors).
// lastOp is used as the optime to wait for when write concern waits for replication.
(function() {
var replTest = new ReplSetTest({name: 'testSet', nodes: 1});
replTest.startSet();
replTest.initiate();

var primary = replTest.getPrimary();

// Two connections
var m1 = new Mongo(primary.host);
var m2 = new Mongo(primary.host);

// Do a write with m1, then a write with m2, then a no-op write with m1. m1 should have a lastOp
// of m2's write.

assert.commandWorked(m1.getCollection("test.foo").insert({m1: 1}));
var firstOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.commandWorked(m2.getCollection("test.foo").insert({m2: 99}));
var secondOp = m2.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

// No-op update
assert.commandWorked(m1.getCollection("test.foo").update({m1: 1}, {$set: {m1: 1}}));
var noOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.eq(noOp, secondOp);

assert.commandWorked(m1.getCollection("test.foo").remove({m1: 1}));
var thirdOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.commandWorked(m2.getCollection("test.foo").insert({m2: 98}));
var fourthOp = m2.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

// No-op delete
assert.commandWorked(m1.getCollection("test.foo").remove({m1: 1}));
noOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.eq(noOp, fourthOp);

// Dummy write, for a new lastOp.
assert.commandWorked(m1.getCollection("test.foo").insert({m1: 99}));
var fifthOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.commandWorked(m2.getCollection("test.foo").insert({m2: 97}));
var sixthOp = m2.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

// No-op find-and-modify delete
m1.getCollection("test.foo").findAndModify({query: {m1: 1}, remove: 'true'});
noOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.eq(noOp, sixthOp);

assert.commandWorked(m1.getCollection("test.foo").createIndex({x: 1}));
var seventhOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.commandWorked(m2.getCollection("test.foo").insert({m2: 96}));
var eighthOp = m2.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

// No-op create index.
assert.commandWorked(m1.getCollection("test.foo").createIndex({x: 1}));
noOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.eq(noOp, eighthOp);

assert.commandWorked(m1.getCollection("test.foo").insert({_id: 1, x: 1}));
var ninthOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.commandWorked(m2.getCollection("test.foo").insert({m2: 991}));
var tenthOp = m2.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

// update with immutable field error
assert.writeError(m1.getCollection("test.foo").update({_id: 1, x: 1}, {$set: {_id: 2}}));
// "After applying the update to the document {_id: 1.0 , ...}, the (immutable) field '_id'
// was found to have been altered to _id: 2.0"
noOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.eq(noOp, tenthOp);

assert.commandWorked(m2.getCollection("test.foo").insert({m2: 992}));
var eleventhOp = m2.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

// find-and-modify immutable field error
try {
    m1.getCollection("test.foo").findAndModify({query: {_id: 1, x: 1}, update: {$set: {_id: 2}}});
    // The findAndModify shell helper should throw.
    assert(false);
} catch (e) {
    assert.eq(e.code, 66);
}
noOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.eq(noOp, eleventhOp);

var bigString = new Array(3000).toString();
assert.commandWorked(m2.getCollection("test.foo").insert({m2: 994, m3: bigString}));

// No-op insert
assert.commandWorked(m1.getCollection("test.foo").insert({_id: 5, x: 5}));
var thirteenthOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.commandWorked(m2.getCollection("test.foo").insert({m2: 991}));
var fourteenthOp = m2.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

// Hits DuplicateKey error and fails insert -- no-op
assert.writeError(m1.getCollection("test.foo").insert({_id: 5, x: 5}));
noOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

assert.eq(noOp, fourteenthOp);

// Test update and delete failures in legacy write mode.
m2.forceWriteMode('legacy');
m1.forceWriteMode('legacy');
m2.getCollection("test.foo").insert({m2: 995});
var fifthteenthOp = m2.getCollection("test.foo").getDB().getLastErrorObj().lastOp;

m1.getCollection("test.foo").remove({m1: 1});
noOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;
assert.eq(noOp, fifthteenthOp);

m1.getCollection("test.foo").update({m1: 1}, {$set: {m1: 4}});
noOp = m1.getCollection("test.foo").getDB().getLastErrorObj().lastOp;
assert.eq(noOp, fifthteenthOp);
replTest.stopSet();
})();