[beam] branch master updated: Fix race exception in python worker status thread dump

[goenka]

This is an automated email from the ASF dual-hosted git repository.

goenka pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/beam.git


The following commit(s) were added to refs/heads/master by this push:
     new 294b2e6  Fix race exception in python worker status thread dump
     new 78ab631  Merge pull request #10797 from y1chi/py_thread_dump
294b2e6 is described below

commit 294b2e60c3bb0743accd33fa164539638f7efcc0
Author: Yichi Zhang <zyi...@google.com>
AuthorDate: Thu Feb 6 17:07:35 2020 -0800

    Fix race exception in python worker status thread dump
---
 sdks/python/apache_beam/runners/worker/worker_status.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sdks/python/apache_beam/runners/worker/worker_status.py 
b/sdks/python/apache_beam/runners/worker/worker_status.py
index 494f953..8c5ce76 100644
--- a/sdks/python/apache_beam/runners/worker/worker_status.py
+++ b/sdks/python/apache_beam/runners/worker/worker_status.py
@@ -41,7 +41,12 @@ def thread_dump():
   frames = sys._current_frames()  # pylint: disable=protected-access
 
   for t in threading.enumerate():
-    stack_trace = ''.join(traceback.format_stack(frames[t.ident]))
+    try:
+      stack_trace = ''.join(traceback.format_stack(frames[t.ident]))
+    except KeyError:
+      # the thread may have been destroyed already while enumerating, in such
+      # case, skip to next thread.
+      continue
     thread_ident_name = (t.ident, t.name)
     stack_traces[stack_trace].append(thread_ident_name)