class_docstr: Tracker that tracks the resources.
code: def __init__(self, sock, stop_key):
      self._scheduler_map = {}
      self._sock = sock
      self._sock.setblocking(0)
      self._ioloop = ioloop.IOLoop.current()
      self._stop_key = stop_key
      self._connections = set()
  
      def _event_handler(_, events):
          self._on_event(events)
  
      self._ioloop.add_handler(
          self._sock.fileno(), _event_handler, self._ioloop.READ
      )
  
imports: import asyncio
  import heapq
  import logging
  import socket
  import threading
  import errno
  import struct
  import json
  from tvm.contrib.popen_pool import PopenWorker
  from .._ffi.base import py_str
  from .None import base
  from .base import RPC_TRACKER_MAGIC, TrackerCode
label_desc: Use image node_id 1 to create a new TrackerServerHandler object from inherited base classes: object with example: obj = TrackerServerHandler(sock, stop_key)