Fix the issue of duplicate traceId and spanId caused by RandomIdGener…

…ator.

opentelemetry-sdk/src/opentelemetry/sdk/trace/id_generator.py

@@ -47,14 +47,17 @@ class RandomIdGenerator(IdGenerator):
     bits when generating IDs.
     """
 
+    def __init__(self):
+        self._rand = random.Random()
+
     def generate_span_id(self) -> int:
-        span_id = random.getrandbits(64)
+        span_id = self._rand.getrandbits(64)
         while span_id == trace.INVALID_SPAN_ID:
-            span_id = random.getrandbits(64)
+            span_id = self._rand.getrandbits(64)
         return span_id
 
     def generate_trace_id(self) -> int:
-        trace_id = random.getrandbits(128)
+        trace_id = self._rand.getrandbits(128)
         while trace_id == trace.INVALID_TRACE_ID:
-            trace_id = random.getrandbits(128)
+            trace_id = self._rand.getrandbits(128)
         return trace_id

opentelemetry-sdk/tests/trace/test_id_generator.py

@@ -0,0 +1,15 @@
+import unittest
+
+from opentelemetry.sdk.trace import RandomIdGenerator
+
+
+class TestIdGenerator(unittest.TestCase):
+
+    def test_random_id_generator(self):
+        import random
+        random.seed(10)
+        id_generator = RandomIdGenerator()
+        trace_id = id_generator.generate_trace_id()
+        span_id = id_generator.generate_span_id()
+        self.assertNotEqual(trace_id, 164207228320579316746596838417247989971)
+        self.assertNotEqual(span_id, 273610340023782072)