SERVER-17723 Sharding catalog cache

This change builds a sharding catalog cache on top of the CatalogManager
abstraction and use this in place of the direct network calls to the
config server.

4 files changed, 26 insertions, 11 deletions

diff --git a/jstests/sharding/drop_configdb.js b/jstests/sharding/drop_configdb.js
index f445fafb34e..9fbccff0ee6 100644
--- a/jstests/sharding/drop_configdb.js
+++ b/jstests/sharding/drop_configdb.js
@@ -7,20 +7,17 @@ var config = st._configServers[0].getDB('config');
 // Try to drop config db via configsvr
 
 print ( "1: Try to drop config database via configsvr" )
-config.dropDatabase()
-
-print ( "2: Ensure it wasn't dropped" )
-assert.eq( 1, config.databases.find({ _id : "admin", partitioned : false, primary : "config"}).toArray().length )
-
+assert.eq(0, config.dropDatabase().ok);
+assert.eq("Cannot drop 'config' database if mongod started with --configsvr",
+          config.dropDatabase().errmsg);
 
 // Try to drop config db via mongos
-
 var config = mongos.getDB( "config" )
 
 print ( "1: Try to drop config database via mongos" )
-config.dropDatabase()
+assert.eq(0, config.dropDatabase().ok);
 
-print ( "2: Ensure it wasn't dropped" )
-assert.eq( 1, config.databases.find({ _id : "admin", partitioned : false, primary : "config"}).toArray().length )
+// 20 = ErrorCodes::IllegalOperation
+assert.eq(20, config.dropDatabase().code);
 
-st.stop();
\ No newline at end of file
+st.stop();
diff --git a/jstests/sharding/moveprimary_ignore_sharded.js b/jstests/sharding/moveprimary_ignore_sharded.js
index c73f73427c6..c5fda358840 100644
--- a/jstests/sharding/moveprimary_ignore_sharded.js
+++ b/jstests/sharding/moveprimary_ignore_sharded.js
@@ -49,7 +49,7 @@ st.printShardingStatus();
 jsTest.log( "Running movePrimary for foo through mongosA ..." )
 
 // MongosA should already know about all the collection states
-printjson( adminA.runCommand({ movePrimary : "foo", to : fooOtherShard._id }) )
+printjson( adminA.runCommand({ movePrimary : "foo", to : fooOtherShard._id }) );
 
 // All collections still correctly sharded / unsharded
 assert.neq( null, mongosA.getCollection("foo.coll0").findOne() );
@@ -76,6 +76,11 @@ assert.eq( 1, realCollectionCount( new Mongo( fooOtherShard.host ).getDB( "foo"
 jsTest.log( "Running movePrimary for bar through mongosB ..." );
 printjson( adminB.runCommand({ movePrimary : "bar", to : barOtherShard._id }) );
 
+// We need to flush the cluster config on mongosA, so it can discover that database 'bar' got
+// moved. Otherwise since the collections are not sharded, we have no way of discovering this.
+// See SERVER-8059.
+adminA.runCommand({ flushRouterConfig : 1 });
+
 // All collections still correctly sharded / unsharded
 assert.neq( null, mongosA.getCollection("bar.coll0").findOne() );
 assert.neq( null, mongosA.getCollection("bar.coll1").findOne() );
diff --git a/jstests/sharding/read_does_not_create_namespaces.js b/jstests/sharding/read_does_not_create_namespaces.js
new file mode 100644
index 00000000000..d07280fc0d3
--- /dev/null
+++ b/jstests/sharding/read_does_not_create_namespaces.js
@@ -0,0 +1,12 @@
+// This test ensures that just attempting to read from a non-existent database or collection won't

+// cause entries to be created in the catalog.

+var shardingTest = new ShardingTest('read_does_not_create_namespaces', 1);

+var db = shardingTest.getDB('NonExistentDB');

+

+assert.isnull(db.nonExistentColl.findOne({}));

+

+// Neither the database nor the collection should have been created

+assert.isnull(shardingTest.getDB('config').databases.findOne({ _id: 'NonExistentDB' }));

+assert.eq(-1, shardingTest.shard0.getDBNames().indexOf('NonExistentDB'));

+

+shardingTest.stop();
\ No newline at end of file
diff --git a/jstests/slow2/sharding_jscore_passthrough.js b/jstests/slow2/sharding_jscore_passthrough.js
index 3d257e5f0ef..209cd3dd504 100644
--- a/jstests/slow2/sharding_jscore_passthrough.js
+++ b/jstests/slow2/sharding_jscore_passthrough.js
@@ -72,6 +72,7 @@ files.forEach(function(x) {
         'profile\\d*|' +
         'dbhash|' +
         'dbhash2|' +
+        'explain_missing_database|' +
         'median|' +
         'evalb|' +
         'evald|' +