SERVER-39441 Write the new 'prepareTransaction' command on primary

1 files changed, 3 insertions, 2 deletions

diff --git a/src/mongo/db/op_observer.h b/src/mongo/db/op_observer.h
index a6664937df6..dadbe435cc5 100644
--- a/src/mongo/db/op_observer.h
+++ b/src/mongo/db/op_observer.h
@@ -309,12 +309,13 @@ public:
      * The onTransactionPrepare method is called when an atomic transaction is prepared. It must be
      * called when a transaction is active.
      *
-     * The 'prepareOpTime' is passed in to be used as the OpTime of the oplog entry.
+     * 'reservedSlots' is a list of oplog slots reserved for the oplog entries in a transaction. The
+     * last reserved slot represents the prepareOpTime used for the prepare oplog entry.
      *
      * The 'statements' are the list of CRUD operations to be applied in this transaction.
      */
     virtual void onTransactionPrepare(OperationContext* opCtx,
-                                      const OplogSlot& prepareOpTime,
+                                      const std::vector<OplogSlot>& reservedSlots,
                                       std::vector<repl::ReplOperation>& statements) = 0;
 
     /**