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// presplit.js
// Starts a new sharding environment limiting the chunksize to 1MB.
s = new ShardingTest( "presplit" , 2 , 2 , 1 , { chunksize : 1 } );
// Insert enough data in 'test.foo' to fill several chunks, if it was sharded.
bigString = "";
while ( bigString.length < 10000 ){
bigString += "asdasdasdasdadasdasdasdasdasdasdasdasda";
}
db = s.getDB( "test" );
inserted = 0;
num = 0;
while ( inserted < ( 20 * 1024 * 1024 ) ){
db.foo.insert( { _id : num++ , s : bigString } );
inserted += bigString.length;
}
db.getLastError();
// Make sure that there's only one chunk holding all the data.
s.printChunks();
primary = s.getServer( "test" ).getDB( "test" );
assert.eq( 0 , s.config.chunks.count() , "single chunk assertion" );
assert.eq( num , primary.foo.count() );
// Turn on sharding on the 'test.foo' collection
s.adminCommand( { enablesharding : "test" } );
s.adminCommand( { shardcollection : "test.foo" , key : { _id : 1 } } );
// Make sure the collection's original chunk got split
s.printChunks();
assert.lt( 20 , s.config.chunks.count() , "many chunks assertion" );
assert.eq( num , primary.foo.count() );
s.printChangeLog();
s.stop();
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