bugfix: batch processor doesn't work with uwsgi (#2277)

opentelemetry-sdk/src/opentelemetry/sdk/_logs/export/__init__.py

@@ -24,6 +24,7 @@
 
 from opentelemetry.context import attach, detach, set_value
 from opentelemetry.sdk._logs import LogData, LogProcessor, LogRecord
+from opentelemetry.util._once import Once
 from opentelemetry.util._time import _time_ns
 
 _logger = logging.getLogger(__name__)
@@ -129,6 +130,9 @@ def __init__(self):
         self.num_log_records = 0
 
 
+_BSP_RESET_ONCE = Once()
+
+
 class BatchLogProcessor(LogProcessor):
     """This is an implementation of LogProcessor which creates batches of
     received logs in the export-friendly LogData representation and
@@ -164,6 +168,7 @@ def __init__(
             os.register_at_fork(
                 after_in_child=self._at_fork_reinit
             )  # pylint: disable=protected-access
+        self._pid = os.getpid()
 
     def _at_fork_reinit(self):
         self._condition = threading.Condition(threading.Lock())
@@ -174,6 +179,7 @@ def _at_fork_reinit(self):
             daemon=True,
         )
         self._worker_thread.start()
+        self._pid = os.getpid()
 
     def worker(self):
         timeout = self._schedule_delay_millis / 1e3
@@ -293,6 +299,9 @@ def emit(self, log_data: LogData) -> None:
         """
         if self._shutdown:
             return
+        if self._pid != os.getpid():
+            _BSP_RESET_ONCE.do_once(self._at_fork_reinit)
+
         self._queue.appendleft(log_data)
         if len(self._queue) >= self._max_export_batch_size:
             with self._condition:

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

@@ -36,6 +36,7 @@
     OTEL_BSP_SCHEDULE_DELAY,
 )
 from opentelemetry.sdk.trace import ReadableSpan, Span, SpanProcessor
+from opentelemetry.util._once import Once
 from opentelemetry.util._time import _time_ns
 
 logger = logging.getLogger(__name__)
@@ -119,6 +120,9 @@ def __init__(self):
         self.num_spans = 0
 
 
+_BSP_RESET_ONCE = Once()
+
+
 class BatchSpanProcessor(SpanProcessor):
     """Batch span processor implementation.
 
@@ -203,6 +207,7 @@ def __init__(
             os.register_at_fork(
                 after_in_child=self._at_fork_reinit
             )  # pylint: disable=protected-access
+        self._pid = os.getpid()
 
     def on_start(
         self, span: Span, parent_context: typing.Optional[Context] = None
@@ -215,6 +220,9 @@ def on_end(self, span: ReadableSpan) -> None:
             return
         if not span.context.trace_flags.sampled:
             return
+        if self._pid != os.getpid():
+            _BSP_RESET_ONCE.do_once(self._at_fork_reinit)
+
         if len(self.queue) == self.max_queue_size:
             if not self._spans_dropped:
                 logger.warning("Queue is full, likely spans will be dropped.")
@@ -236,6 +244,7 @@ def _at_fork_reinit(self):
             name="OtelBatchSpanProcessor", target=self.worker, daemon=True
         )
         self.worker_thread.start()
+        self._pid = os.getpid()
 
     def worker(self):
         timeout = self.schedule_delay_millis / 1e3

opentelemetry-sdk/tests/logs/test_export.py

@@ -16,7 +16,6 @@
 import logging
 import multiprocessing
 import os
-import sys
 import time
 import unittest
 from concurrent.futures import ThreadPoolExecutor
@@ -44,8 +43,6 @@
 from opentelemetry.trace import TraceFlags
 from opentelemetry.trace.span import INVALID_SPAN_CONTEXT
 
-supports_register_at_fork = hasattr(os, "fork") and sys.version_info >= (3, 7)
-
 
 class TestSimpleLogProcessor(unittest.TestCase):
     def test_simple_log_processor_default_level(self):
@@ -274,9 +271,9 @@ def bulk_log_and_flush(num_logs):
         finished_logs = exporter.get_finished_logs()
         self.assertEqual(len(finished_logs), 2415)
 
-    @unittest.skipIf(
-        not supports_register_at_fork,
-        "needs *nix and minor version 7 or later",
+    @unittest.skipUnless(
+        hasattr(os, "fork"),
+        "needs *nix",
     )
     def test_batch_log_processor_fork(self):
         # pylint: disable=invalid-name

opentelemetry-sdk/tests/trace/export/test_export.py

@@ -14,7 +14,6 @@
 
 import multiprocessing
 import os
-import sys
 import threading
 import time
 import unittest
@@ -369,8 +368,8 @@ def _check_fork_trace(self, exporter, expected):
             self.assertIn(span.name, expected)
 
     @unittest.skipUnless(
-        hasattr(os, "fork") and sys.version_info >= (3, 7),
-        "needs *nix and minor version 7 or later",
+        hasattr(os, "fork"),
+        "needs *nix",
     )
     def test_batch_span_processor_fork(self):
         # pylint: disable=invalid-name