mongodb/jstests/gle/gle_explicit_optime.js

//
// Tests the use of the wOpTime option in getLastError
//

var rst = new ReplSetTest({ nodes : 2 });
rst.startSet();
rst.initiate();

var primary = rst.getPrimary();
var secondary = rst.getSecondary();

var coll = primary.getCollection( "foo.bar" );

// Insert a doc and replicate it to two servers
coll.insert({ some : "doc" });
var gleObj = coll.getDB().getLastErrorObj( 2 ); // w : 2
assert.eq( null, gleObj.err );
var opTimeBeforeFailure = gleObj.lastOp;

// Lock the secondary
secondary.getDB("admin").fsyncLock();

// Insert a doc and replicate it to the primary only
coll.insert({ some : "doc" });
gleObj = coll.getDB().getLastErrorObj( 1 ); // w : 1
assert.eq( null, gleObj.err );
var opTimeAfterFailure = gleObj.lastOp;

printjson(opTimeBeforeFailure);
printjson(opTimeAfterFailure);
printjson( primary.getDB("admin").runCommand({ replSetGetStatus : true }) );

// Create a new connection with new client and no opTime
var newClientConn = new Mongo( primary.host );

// New client has no set opTime, so w : 2 has no impact
gleObj = newClientConn.getCollection( coll.toString() ).getDB().getLastErrorObj( 2 ); // w : 2
assert.eq( null, gleObj.err );

// Using an explicit optime on the new client should work if the optime is earlier than the
// secondary was locked
var gleOpTimeBefore = { getLastError : true, w : 2, wOpTime : opTimeBeforeFailure };
gleObj = newClientConn.getCollection( coll.toString() ).getDB().runCommand( gleOpTimeBefore );
assert.eq( null, gleObj.err );

// Using an explicit optime on the new client should not work if the optime is later than the
// secondary was locked
var gleOpTimeAfter = { getLastError : true, w : 2, wtimeout : 1000, wOpTime : opTimeAfterFailure };
gleObj = newClientConn.getCollection( coll.toString() ).getDB().runCommand( gleOpTimeAfter );
assert.neq( null, gleObj.err );
assert( gleObj.wtimeout );

jsTest.log("DONE!");

// Unlock the secondary
secondary.getDB("admin").fsyncUnlock();
rst.stopSet();