public FailureCondition getCondition() {
            return condition;
        }
If true, signals that a task has failed and can be immediately marked as
complete without waiting for a version ACK. The task implementation has
the responsibility of communicating any failure to the caller, and ensuring
that the lack of version waiting does not violate any invariants.
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/RemoteClusterControllerTask.java