public NamedQueuePayload getPayload() {
    final NamedQueuePayload namedQueuePayload = this.namedQueuePayload;
    this.namedQueuePayload = null;
    return namedQueuePayload;
  }
Retrieve current namedQueue payload {@link NamedQueuePayload} available on Envelope and free up
the Envelope
@return Retrieve rpc log details
hbase-server/src/main/java/org/apache/hadoop/hbase/namequeues/RingBufferEnvelope.java