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doTest = function( signal ) {
// Test basic replica set functionality.
// -- Replication
// -- Failover
// Replica set testing API
// Create a new replica set test. Specify set name and the number of nodes you want.
var replTest = new ReplSetTest( {name: 'testSet', nodes: 3} );
// call startSet() to start each mongod in the replica set
// this returns a list of nodes
var nodes = replTest.startSet();
// Call initiate() to send the replSetInitiate command
// This will wait for initiation
replTest.initiate();
// Call getMaster to return a reference to the node that's been
// elected master.
var master = replTest.getMaster();
// Calling getMaster also makes available the liveNodes structure,
// which looks like this:
// liveNodes = {master: masterNode,
// slaves: [slave1, slave2]
// }
printjson(replTest.liveNodes);
// Here's how you save something to master
master.getDB("foo").foo.save({a: 1000});
// This method will check the oplogs of the master
// and slaves in the set and wait until the change has replicated.
replTest.awaitReplication();
cppconn = new Mongo( replTest.getURL() ).getDB( "foo" );
assert.eq( 1000 , cppconn.foo.findOne().a , "cppconn 1" );
{
// check c++ finding other servers
var temp = replTest.getURL();
temp = temp.substring( 0 , temp.lastIndexOf( "," ) );
temp = new Mongo( temp ).getDB( "foo" );
assert.eq( 1000 , temp.foo.findOne().a , "cppconn 1" );
}
// Here's how to stop the master node
var master_id = replTest.getNodeId( master );
replTest.stop( master_id );
// Now let's see who the new master is:
var new_master = replTest.getMaster();
// Is the new master the same as the old master?
var new_master_id = replTest.getNodeId( new_master );
assert( master_id != new_master_id, "Old master shouldn't be equal to new master." );
{
// this may fail since it has to reconnect
try {
cppconn.foo.findOne()
}
catch ( e ){
}
assert.eq( 1000 , cppconn.foo.findOne().a , "cppconn 2" );
}
// Now let's write some documents to the new master
for(var i=0; i<1000; i++) {
new_master.getDB("bar").bar.save({a: i});
}
new_master.getDB("admin").runCommand({getlasterror: 1});
// Here's how to restart the old master node:
slave = replTest.restart( master_id );
// Now, let's make sure that the old master comes up as a slave
assert.soon(function() {
var res = slave.getDB("admin").runCommand({ismaster: 1});
printjson(res);
return res['ok'] == 1 && res['ismaster'] == false;
});
// And we need to make sure that the replset comes back up
assert.soon(function() {
var res = new_master.getDB("admin").runCommand({replSetGetStatus: 1});
printjson( res );
return res.myState == 1;
});
// And that both slave nodes have all the updates
new_master = replTest.getMaster();
assert.eq( 1000 , new_master.getDB( "bar" ).runCommand( { count:"bar"} ).n , "assumption 2")
replTest.awaitReplication();
slaves = replTest.liveNodes.slaves;
assert( slaves.length == 2, "Expected 2 slaves but length was " + slaves.length );
slaves.forEach(function(slave) {
slave.setSlaveOk();
var count = slave.getDB("bar").runCommand({count: "bar"});
printjson( count );
assert.eq( 1000 , count.n , "slave count wrong: " + slave );
});
// Shut down the set and finish the test.
replTest.stopSet( signal );
}
doTest( 15 );
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