Add environment and rpc_layer to the TF_CONFIG environment variable i…

…n distribute coordinator.

PiperOrigin-RevId: 210197404

tensorflow/python/distribute/distribute_coordinator.py

@@ -22,9 +22,12 @@
 import json
 import os
 import threading
+import time
 
 from tensorflow.core.protobuf import cluster_pb2
+from tensorflow.python.client import session
 from tensorflow.python.distribute import distribute_coordinator_context
+from tensorflow.python.platform import tf_logging as logging
 from tensorflow.python.training import monitored_session
 from tensorflow.python.training import server_lib
 
@@ -332,16 +335,38 @@ def _run_std_server(cluster_spec=None,
                     task_type=None,
                     task_id=None,
                     session_config=None,
-                    rpc_layer=None):
+                    rpc_layer=None,
+                    environment=None):
   """Runs a standard server."""
-  server = server_lib.Server(
-      cluster_spec,
-      job_name=task_type,
-      task_index=task_id,
-      config=session_config,
-      protocol=rpc_layer)
-  server.start()
-  return server
+
+  class _FakeServer(object):
+    """A fake server that runs a master session."""
+
+    def start(self):
+      assert cluster_spec
+      target = cluster_spec.task_address(task_type, task_id)
+      if rpc_layer:
+        target = rpc_layer + "://" + target
+      # A tensorflow server starts when a remote session is created.
+      session.Session(target=target, config=session_config)
+
+    def join(self):
+      while True:
+        time.sleep(5)
+
+  if environment == "google":
+    server = _FakeServer()
+    server.start()
+    return server
+  else:
+    server = server_lib.Server(
+        cluster_spec,
+        job_name=task_type,
+        task_index=task_id,
+        config=session_config,
+        protocol=rpc_layer)
+    server.start()
+    return server
 
 
 def _run_between_graph_client(worker_fn, strategy, eval_fn, eval_strategy,
@@ -541,8 +566,18 @@ def run_distribute_coordinator(worker_fn,
           "`tf.train.ClusterDef` object")
     # TODO(yuefengz): validate cluster_spec.
 
+  rpc_layer = tf_config.get("rpc_layer", rpc_layer)
+  environment = tf_config.get("environment", None)
+
+  if cluster_spec:
+    logging.info(
+        "Running Distribute Coordinator with mode = %r, cluster_spec = %r, "
+        "task_type = %r, task_id = %r, environment = %r, rpc_layer = %r", mode,
+        cluster_spec.as_dict(), task_type, task_id, environment, rpc_layer)
+
   if not cluster_spec:
     # `mode` is ignored in the local case.
+    logging.info("Running local Distribute Coordinator.")
     _run_single_worker(worker_fn, strategy, None, None, None, session_config,
                        rpc_layer)
     if eval_fn:
@@ -564,7 +599,11 @@ def run_distribute_coordinator(worker_fn,
     else:
       # If not a client job, run the standard server.
       server = _run_std_server(
-          cluster_spec=cluster_spec, task_type=task_type, task_id=task_id)
+          cluster_spec=cluster_spec,
+          task_type=task_type,
+          task_id=task_id,
+          rpc_layer=rpc_layer,
+          environment=environment)
       server.join()
   else:
     if mode != CoordinatorMode.INDEPENDENT_WORKER:
@@ -575,7 +614,11 @@ def run_distribute_coordinator(worker_fn,
 
     # Every one starts a standard server.
     server = _run_std_server(
-        cluster_spec=cluster_spec, task_type=task_type, task_id=task_id)
+        cluster_spec=cluster_spec,
+        task_type=task_type,
+        task_id=task_id,
+        rpc_layer=rpc_layer,
+        environment=environment)
 
     if task_type in [_TaskType.CHIEF, _TaskType.WORKER]:
       if strategy.between_graph:

tensorflow/python/distribute/distribute_coordinator_test.py

@@ -20,8 +20,10 @@
 
 import contextlib
 import copy
+import json
 import os
 import sys
+import time
 import threading
 import six
 
@@ -59,6 +61,8 @@
 NUM_WORKERS = 3
 NUM_PS = 2
 
+original_sys_exit = sys.exit
+
 
 def _bytes_to_str(maybe_bytes):
   if isinstance(maybe_bytes, six.string_types):
@@ -369,7 +373,8 @@ def _run_mock_std_server(self,
                            cluster_spec=None,
                            task_type=None,
                            task_id=None,
-                           rpc_layer=None):
+                           rpc_layer=None,
+                           environment=None):
     task_type = str(task_type)
     task_id = task_id or 0
     with self._lock:
@@ -730,6 +735,63 @@ def testInGraphContextWithEval(self):
     self.assertTrue(self._std_servers[WORKER][2].joined)
     self.assertFalse(self._std_servers[EVALUATOR][0].joined)
 
+  def testRunStdServerInGoogleEnvironment(self):
+    cluster_spec = {"worker": ["fake_worker"], "ps": ["localhost:0"]}
+    tf_config = {"cluster": cluster_spec, "environment": "google"}
+
+    joined = [False]
+
+    def _fake_sleep(_):
+      joined[0] = True
+      original_sys_exit(0)
+
+    def _thread_fn(cluster_spec):
+      distribute_coordinator.run_distribute_coordinator(
+          None,
+          None,
+          mode=INDEPENDENT_WORKER,
+          cluster_spec=cluster_spec,
+          task_type="ps",
+          task_id=0)
+
+    with test.mock.patch.dict(
+        "os.environ",
+        {"TF_CONFIG": json.dumps(tf_config)}), test.mock.patch.object(
+            time, "sleep", _fake_sleep):
+      t = threading.Thread(target=_thread_fn, args=(cluster_spec,))
+      t.start()
+      t.join()
+    self.assertTrue(joined[0])
+
+  def testRpcLayerEnvironmentVariable(self):
+    cluster_spec = {"worker": ["fake_worker"], "ps": ["fake_ps"]}
+    tf_config = {"cluster": cluster_spec, "rpc_layer": "cake"}
+
+    rpc_layer_from_coordinator = [None]
+
+    def _run_mock_server(cluster_spec=None,
+                         task_type=None,
+                         task_id=None,
+                         session_config=None,
+                         rpc_layer=None,
+                         environment=None):
+      del cluster_spec, task_type, task_id, session_config, environment
+      rpc_layer_from_coordinator[0] = rpc_layer
+      return MockServer()
+
+    with test.mock.patch.dict(
+        "os.environ",
+        {"TF_CONFIG": json.dumps(tf_config)}), test.mock.patch.object(
+            distribute_coordinator, "_run_std_server", _run_mock_server):
+      distribute_coordinator.run_distribute_coordinator(
+          None,
+          None,
+          mode=INDEPENDENT_WORKER,
+          cluster_spec=cluster_spec,
+          task_type="ps",
+          task_id=0)
+    self.assertEqual(rpc_layer_from_coordinator[0], "cake")
+
 
 if __name__ == "__main__":
   # TODO(yuefengz): find a smart way to terminite std server threads.