void setRetryAllowed(boolean retryAllowed) {
      this.retryAllowed = retryAllowed;
    }
Sets whether tasks created as part of this handler can be retry if they fail. If a task
cannot be retried it will fail the entire request.

@param retryAllowed
ambari-server/src/main/java/org/apache/ambari/server/controller/KerberosHelperImpl.java