mongodb/jstests/repl/pair1.js

// Basic pairing test

var baseName = "jstests_pair1test";

ismaster = function( n ) {
    im = n.getDB( "admin" ).runCommand( { "ismaster" : 1 } );
    assert( im );
    return im.ismaster;
}

var writeOneIdx = 0;

writeOne = function( n ) {
    n.getDB( baseName ).z.save( { _id: new ObjectId(), i: ++writeOneIdx } );
}

getCount = function( n ) {
    return n.getDB( baseName ).z.find( { i: writeOneIdx } ).toArray().length;
}

checkWrite = function( m, s ) {
    writeOne( m );
    assert.eq( 1, getCount( m ) );
    s.setSlaveOk();
    assert.soon( function() {
                if ( -1 == s.getDBNames().indexOf( baseName ) )
                    return false;
                if ( -1 == s.getDB( baseName ).getCollectionNames().indexOf( "z" ) )
                    return false;
                return 1 == getCount( s );
                } );
}

// spec small oplog for fast startup on 64bit machines
a = startMongod( "--port", "27018", "--dbpath", "/data/db/" + baseName + "-arbiter" );
l = startMongod( "--port", "27019", "--dbpath", "/data/db/" + baseName + "-left", "--pairwith", "127.0.0.1:27020", "127.0.0.1:27018", "--oplogSize", "1" );
r = startMongod( "--port", "27020", "--dbpath", "/data/db/" + baseName + "-right", "--pairwith", "127.0.0.1:27019", "127.0.0.1:27018", "--oplogSize", "1" );

assert.soon( function() {
            am = ismaster( a );
            lm = ismaster( l );
            rm = ismaster( r );
            
            assert( am == 1 );
            assert( lm == -1 || lm == 0 );
            assert( rm == -1 || rm == 0 || rm == 1 );
            
            return ( lm == 0 && rm == 1 );
            } );

checkWrite( r, l );

stopMongod( 27020 );

assert.soon( function() {
            lm = ismaster( l );
            assert( lm == 0 || lm == 1 );
            return ( lm == 1 );
            } );

r = startMongod( "--port", "27020", "--dbpath", "/data/db/" + baseName + "-right", "--pairwith", "127.0.0.1:27019", "127.0.0.1:27018", "--oplogSize", "1" );

assert.soon( function() {
            lm = ismaster( l );
            rm = ismaster( r );
            
            assert( lm == 1 );
            assert( rm == -1 || rm == 0 );
            
            return ( rm == 0 );
            } );

// Once this returns, the initial sync for r will have completed.
checkWrite( l, r );

stopMongod( 27019 );

assert.soon( function() {
            rm = ismaster( r );
            assert( rm == 0 || rm == 1 );
            return ( rm == 1 );
            } );

l = startMongod( "--port", "27019", "--dbpath", "/data/db/" + baseName + "-left", "--pairwith", "127.0.0.1:27020", "127.0.0.1:27018", "--oplogSize", "1" );

assert.soon( function() {
            lm = ismaster( l );
            rm = ismaster( r );
            
            assert( lm == -1 || lm == 0 );
            assert( rm == 1 );
            
            return ( lm == 0 && rm == 1 );
            } );

checkWrite( r, l );