question: public boolean createBlockSnapshotRollbackStep ( String stepId ) { WorkflowStepCompleter . stepExecuting ( stepId ) ; _log . info ( String . format ( "rollbackCreateBlockSnapshotStep : Nothing to rollback for step id [%s]" , stepId ) ) ; WorkflowStepCompleter . stepSucceded ( stepId ) ; return true ; }
target:  Rollback method for Block snapshot create.