Fix streaming ci failure (#12830)

streaming/python/includes/transfer.pxi

@@ -385,7 +385,7 @@ cdef c_vector[CObjectID] bytes_list_to_qid_vec(list py_queue_ids) except *:
         c_string q_id_data
     for q_id in py_queue_ids:
         q_id_data = q_id
-        assert q_id_data.size() == CObjectID.Size()
+        assert q_id_data.size() == CObjectID.Size(), f"{q_id_data.size()}, {CObjectID.Size()}"
         obj_id = CObjectID.FromBinary(q_id_data)
         queue_id_vec.push_back(obj_id)
     return queue_id_vec

streaming/python/runtime/transfer.py

@@ -14,7 +14,7 @@ from ray._raylet import JavaFunctionDescriptor
 from ray._raylet import PythonFunctionDescriptor
 from ray._raylet import Language
 
-CHANNEL_ID_LEN = 20
+CHANNEL_ID_LEN = ray.ObjectID.nil().size()
 logger = logging.getLogger(__name__)
 
 
@@ -58,8 +58,8 @@ class ChannelID:
 
     @staticmethod
     def gen_id(from_index, to_index, ts):
-        """Generate channel id, which is 20 character"""
-        channel_id = bytearray(20)
+        """Generate channel id, which is `CHANNEL_ID_LEN` character"""
+        channel_id = bytearray(CHANNEL_ID_LEN)
         for i in range(11, 7, -1):
             channel_id[i] = ts & 0xff
             ts >>= 8

streaming/python/tests/test_hybrid_stream.py

@@ -1,7 +1,5 @@
-import json
 import os
 import subprocess
-import sys
 
 import ray
 from ray.streaming import StreamingContext
@@ -31,12 +29,8 @@ def test_hybrid_stream():
         "../../../bazel-bin/streaming/java/all_streaming_tests_deploy.jar")
     jar_path = os.path.abspath(jar_path)
     print("jar_path", jar_path)
-    java_worker_options = json.dumps(["-classpath", jar_path])
-    print("java_worker_options", java_worker_options)
     assert not ray.is_initialized()
-    ray.init(
-        job_config=ray.job_config.JobConfig(code_search_path=sys.path),
-        _java_worker_options=java_worker_options)
+    ray.init(job_config=ray.job_config.JobConfig(code_search_path=[jar_path]))
 
     sink_file = "/tmp/ray_streaming_test_hybrid_stream.txt"
     if os.path.exists(sink_file):