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// Test that you can shard with shard key that's only a prefix of an existing index.
//
// Part 1: Shard new collection on {num : 1} with an index on {num : 1, x : 1}.
// Test that you can split and move chunks around.
// Part 2: Test that adding an array value for x doesn't make it unusuable.
// Part 3: Shard new collection on {skey : 1} but with a longer index.
// Insert docs with same val for 'skey' but different vals for 'extra'.
// Move chunks around and check that [min,max) chunk boundaries are properly obeyed.
var s = new ShardingTest({ name : jsTestName(), shards : 2 });
var db = s.getDB( "test" );
var admin = s.getDB( "admin" );
var config = s.getDB( "config" );
var shards = config.shards.find().toArray();
var shard0 = new Mongo( shards[0].host );
var shard1 = new Mongo( shards[1].host );
s.adminCommand( { enablesharding : "test" } );
//******************Part 1********************
var coll = db.foo;
var longStr = 'a';
while ( longStr.length < 1024 * 128 ) { longStr += longStr; }
for( i=0 ; i<100; i++){
coll.save( {num : i, str : longStr} );
coll.save( {num : i+100 , x : i, str : longStr})
}
db.getLastError();
//no usable index yet, should throw
assert.throws( function(){ s.adminCommand( { shardCollection : coll.getFullName(), key : { num : 1 } } ) } )
//create usable index
coll.ensureIndex({num : 1, x : 1});
db.getLastError();
//usable index, but doc with empty 'num' value, so still should throw
coll.save({x : -5});
assert( ! db.getLastError() , "save bad value didn't succeed");
assert.throws( function(){ s.adminCommand( { shardCollection : coll.getFullName(), key : { num : 1 } } ) } )
//remove the bad doc. now should finally succeed
coll.remove( {x : -5});
assert( ! db.getLastError() , "remove bad value didn't succeed");
var result1 = admin.runCommand( { shardCollection : coll.getFullName(), key : { num : 1 } } );
printjson( result1 );
assert.eq( 1, result1.ok , "sharding didn't succeed");
//make sure extra index is not created
assert.eq( 2, coll.getIndexes().length );
// make sure balancing happens
s.awaitBalance( coll.getName(), db.getName() );
// Make sure our initial balance cleanup doesn't interfere with later migrations.
assert.soon( function(){
print( "Waiting for migration cleanup to occur..." );
return coll.count() == coll.find().itcount();
})
s.stopBalancer();
//test splitting
var result2 = admin.runCommand( { split : coll.getFullName() , middle : { num : 50 } } );
printjson( result2 );
assert.eq( 1, result2.ok , "splitting didn't succeed");
//test moving
var result3 = admin.runCommand({ movechunk: coll.getFullName(), find: { num: 20 },
to: s.getOther(s.getServer("test")).name, _waitForDelete: true });
printjson( result3 );
assert.eq( 1, result3.ok , "moveChunk didn't succeed");
//******************Part 2********************
// Migrations and splits will still work on a sharded collection that only has multi key
// index.
db.user.ensureIndex({ num: 1, x: 1 });
db.adminCommand({ shardCollection: 'test.user', key: { num: 1 }});
var indexCount = db.system.indexes.find({ ns: 'test.user' }).count();
assert.eq(2, indexCount, // indexes for _id_ and num_1_x_1
'index count not expected: ' + tojson(db.system.indexes.find().toArray()));
var array = [];
for (var item = 0; item < 50; item++) {
array.push(item);
}
for (var docs = 0; docs < 1000; docs++) {
db.user.insert({ num: docs, x: array });
}
assert.eq(1000, db.user.find().itcount());
var result4 = admin.runCommand({ movechunk: 'test.user', find: { num: 70 },
to: s.getOther(s.getServer("test")).name, _waitForDelete: true });
assert.commandWorked(result4);
var expectedShardCount = { shard0000: 0, shard0001: 0 };
config.chunks.find({ ns: 'test.user' }).forEach(function(chunkDoc) {
var min = chunkDoc.min.num;
var max = chunkDoc.max.num;
if (min < 0 || min == MinKey) {
min = 0;
}
if (max > 1000 || max == MaxKey) {
max = 1000;
}
if (max > 0) {
expectedShardCount[chunkDoc.shard] += (max - min);
}
});
assert.eq(expectedShardCount['shard0000'], shard0.getDB('test').user.find().count());
assert.eq(expectedShardCount['shard0001'], shard1.getDB('test').user.find().count());
result4 = admin.runCommand({ split: 'test.user', middle: { num: 70 }});
assert.commandWorked(result4);
assert.eq(expectedShardCount['shard0000'], shard0.getDB('test').user.find().count());
assert.eq(expectedShardCount['shard0001'], shard1.getDB('test').user.find().count());
//******************Part 3********************
// Check chunk boundaries obeyed when using prefix shard key.
// This test repeats with shard key as the prefix of different longer indices.
for( i=0; i < 3; i++ ){
// setup new collection on shard0
var coll2 = db.foo2;
coll2.drop();
var moveRes = admin.runCommand( { movePrimary : coll2.getDB() + "", to : shards[0]._id } );
assert.eq( moveRes.ok , 1 , "primary not moved correctly" );
// declare a longer index
if ( i == 0 ) {
coll2.ensureIndex( { skey : 1, extra : 1 } );
}
else if ( i == 1 ) {
coll2.ensureIndex( { skey : 1, extra : -1 } );
}
else if ( i == 2 ) {
coll2.ensureIndex( { skey : 1, extra : 1 , superfluous : -1 } );
}
db.getLastError();
// then shard collection on prefix
var shardRes = admin.runCommand( { shardCollection : coll2 + "", key : { skey : 1 } } );
assert.eq( shardRes.ok , 1 , "collection not sharded" );
// insert docs with same value for skey
for( var i = 0; i < 5; i++ ){
for( var j = 0; j < 5; j++ ){
coll2.insert( { skey : 0, extra : i , superfluous : j } );
}
}
assert.eq( null, coll2.getDB().getLastError() , "inserts didn't work" );
// split on that key, and check it makes 2 chunks
var splitRes = admin.runCommand( { split : coll2 + "", middle : { skey : 0 } } );
assert.eq( splitRes.ok , 1 , "split didn't work" );
assert.eq( config.chunks.find( { ns : coll2.getFullName() } ).count() , 2 );
// movechunk should move ALL docs since they have same value for skey
moveRes = admin.runCommand({ moveChunk: coll2 + "", find: { skey: 0 },
to: shards[1]._id, _waitForDelete: true });
assert.eq( moveRes.ok , 1 , "movechunk didn't work" );
// Make sure our migration eventually goes through before testing individual shards
assert.soon( function(){
print( "Waiting for migration cleanup to occur..." );
return coll2.count() == coll2.find().itcount();
})
// check no orphaned docs on the shards
assert.eq( 0 , shard0.getCollection( coll2 + "" ).find().itcount() );
assert.eq( 25 , shard1.getCollection( coll2 + "" ).find().itcount() );
// and check total
assert.eq( 25 , coll2.find().itcount() , "bad total number of docs after move" );
db.printShardingStatus();
}
s.stop();
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