s = new ShardingTest( "migrateBig" , 2 , 0 , 1 , { chunksize : 1 } );

s.adminCommand( { enablesharding : "test" } );
s.adminCommand( { shardcollection : "test.foo" , key : { x : 1 } } );

db = s.getDB( "test" )
coll = db.foo

big = ""
while ( big.length < 10000 )
    big += "eliot"

for ( x=0; x<100; x++ )
    coll.insert( { x : x , big : big } )

s.adminCommand( { split : "test.foo" , middle : { x : 33 } } )
s.adminCommand( { split : "test.foo" , middle : { x : 66 } } )
s.adminCommand( { movechunk : "test.foo" , find : { x : 90 } , to : s.getOther( s.getServer( "test" ) ).name } )

db.printShardingStatus()

print( "YO : "  + s.getServer( "test" ).host )
direct = new Mongo( s.getServer( "test" ).host )
print( "direct : " + direct )

directDB = direct.getDB( "test" )

for ( done=0; done<2*1024*1024; done+=big.length ){
    directDB.foo.insert( { x : 50 + Math.random() , big : big } )
    directDB.getLastError();
}

db.printShardingStatus()

assert.throws( function(){  s.adminCommand( { movechunk : "test.foo" , find : { x : 50 } , to : s.getOther( s.getServer( "test" ) ).name } ); } , [] , "move should fail" )

for ( i=0; i<20; i+= 2 ) {
    try {
        s.adminCommand( { split : "test.foo" , middle : { x : i } } );
    }
    catch ( e ) {
        // we may have auto split on some of these
        // which is ok
        print(e);
    }
}

db.printShardingStatus()

assert.soon( function(){ var x = s.chunkDiff( "foo" , "test" ); print( "chunk diff: " + x ); return x < 2; } , "no balance happened" , 8 * 60 * 1000 , 2000 ) 

s.stop()