M202 week5 sample

gistfile1.js

Here is one possible solution to the Game of Thrones problem we posed. Please note that we are passing a configuration document to ShardingTest. This will ensure the mongods are created using small files and without preallocating data files and journal files. It should eliminate problems with disk space that some students have reported when using ShardingTest.
config = { d0 : { smallfiles : "", noprealloc : "", nopreallocj : ""}, d1 : { smallfiles : "", noprealloc : "", nopreallocj : "" }, d2 : { smallfiles : "", noprealloc : "", nopreallocj : ""}};
cluster = new ShardingTest( { shards : config } );
// shard db
sh.enableSharding("houses");

// shard collections
sh.shardCollection("houses.stark", {dire_wolves_owned:1});
sh.shardCollection("houses.lannister", {debt_owed:1});
sh.shardCollection("houses.targaryen", {followers:1});

// Insert sample data
use houses;
var bulk = db.stark.initializeUnorderedBulkOp();

for (var i=0; i < 100000; i++) { bulk.insert({dire_wolves_owned: Math.random()}); }
bulk.execute();
bulk = db.lannister.initializeUnorderedBulkOp();
for (var i=0; i < 100000; i++) { bulk.insert({debt_owed: Math.random()}); }
bulk.execute();
bulk = db.targaryen.initializeUnorderedBulkOp();
for (var i=0; i < 100000; i++) { bulk.insert({followers: Math.random()}); }

bulk.execute();

sh.addShardTag("shard0000", "sta");
sh.addShardTag("shard0001", "lan");
sh.addShardTag("shard0002", "tar");

sh.addTagRange("houses.stark", {dire_wolves_owned:MinKey}, {dire_wolves_owned:MaxKey}, "sta");
sh.addTagRange("houses.lannister", {debt_owed:MinKey}, {debt_owed:MaxKey}, "lan");