SERVER-4617 more descriptive error message on attempt to kill a cursor while in use

1 files changed, 5 insertions, 1 deletions

diff --git a/src/mongo/db/clientcursor.cpp b/src/mongo/db/clientcursor.cpp
index d5d73457493..c9e05e283a2 100644
--- a/src/mongo/db/clientcursor.cpp
+++ b/src/mongo/db/clientcursor.cpp
@@ -747,7 +747,11 @@ namespace mongo {
         if ( ! cc().getAuthenticationInfo()->isAuthorizedReads( nsToDatabase( cursor->ns() ) ) )
             return false;
 
-        assert( cursor->_pinValue < 100 ); // mustn't have an active ClientCursor::Pointer
+        // mustn't have an active ClientCursor::Pointer
+        massert( 16089,
+                str::stream() << "Cannot kill active cursor " << id,
+                cursor->_pinValue < 100 );
+        
         delete cursor;
         return true;
     }