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(function() {
var st = new ShardingTest({ name: 'migrateBig_balancer',
shards: 2,
other: { enableBalancer: true } });
var mongos = st.s;
var admin = mongos.getDB("admin");
db = mongos.getDB("test");
var coll = db.getCollection("stuff");
assert.commandWorked(admin.runCommand({ enablesharding : coll.getDB().getName() }));
st.ensurePrimaryShard(coll.getDB().getName(), 'shard0001');
var data = "x";
var nsq = 16;
var n = 255;
for( var i = 0; i < nsq; i++ ) data += data;
dataObj = {};
for( var i = 0; i < n; i++ ) dataObj["data-" + i] = data;
var bulk = coll.initializeUnorderedBulkOp();
for( var i = 0; i < 40; i++ ) {
bulk.insert({ data: dataObj });
}
assert.writeOK(bulk.execute());
assert.eq( 40 , coll.count() , "prep1" );
printjson( coll.stats() );
admin.printShardingStatus();
admin.runCommand({ shardcollection : "" + coll, key : { _id : 1 } });
assert.lt( 5 , mongos.getDB( "config" ).chunks.find( { ns : "test.stuff" } ).count() , "not enough chunks" );
assert.soon(
function() {
// On *extremely* slow or variable systems, we've seen migrations fail in the critical section and
// kill the server. Do an explicit check for this. SERVER-8781
// TODO: Remove once we can better specify what systems to run what tests on.
try {
assert.commandWorked(st.shard0.getDB("admin").runCommand({ ping: 1 }));
assert.commandWorked(st.shard1.getDB("admin").runCommand({ ping: 1 }));
}
catch(e) {
print("An error occurred contacting a shard during balancing," +
" this may be due to slow disk I/O, aborting test.");
throw e;
}
res = mongos.getDB( "config" ).chunks.group( { cond : { ns : "test.stuff" } ,
key : { shard : 1 } ,
reduce : function( doc , out ){ out.nChunks++; } ,
initial : { nChunks : 0 } } );
printjson( res );
return res.length > 1 && Math.abs( res[0].nChunks - res[1].nChunks ) <= 3;
} ,
"never migrated" , 10 * 60 * 1000 , 1000 );
st.stop();
})();
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