SERVER-14056 Cross-DB renameCollection needs to call commitIfNeeded

Fixes regression introduced in 0abf27ae.

Before 0abf27a, renameCollection used a DBDirectClient to read objects
from the source namespace.  The call to DBClientCursor::next() would
issue a getmore after finishing each batch, which would reach a commit
point (in DBDirectClient::call()).  The port to the new collection
interface removed the use of DBDirectClient, which removed
renameCollection's commit point.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mongo/db/commands/rename_collection.cpp b/src/mongo/db/commands/rename_collection.cpp
index ac31b040f75..851b783aa99 100644
--- a/src/mongo/db/commands/rename_collection.cpp
+++ b/src/mongo/db/commands/rename_collection.cpp
@@ -268,6 +268,7 @@ namespace mongo {
                         errmsg = s.toString();
                         break;
                     }
+                    txn->recoveryUnit()->commitIfNeeded();
                 }
             }