@Override
  public String toString() {
    return toShortString() + " param: "
      + (this.param != null ? ProtobufUtil.getShortTextFormat(this.param) : "") + " connection: "
      + connection.toString();
  }
Call is done. Execution happened and we returned results to client. It is now safe to cleanup.
hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/ServerCall.java