@Override
  public long disconnectSince() {
    if (!this.connection.isConnectionOpen()) {
      return EnvironmentEdgeManager.currentTime() - receiveTime;
    } else {
      return -1L;
    }
  }
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