9897: Logs errors encountered by block prefetch workers.

diff --git a/sdk/python/arvados/arvfile.py b/sdk/python/arvados/arvfile.py
index 610fd7dc1317b6f0a6af7672d148766dbf9ce961..e00eeae47e3890ee7307fb6d7aa9b8e0e87b331e 100644 (file)
--- a/sdk/python/arvados/arvfile.py
+++ b/sdk/python/arvados/arvfile.py
@@ -5,6 +5,7 @@ import bz2
 import config
 import hashlib
 import threading
+import traceback
 import Queue
 import copy
 import errno
@@ -516,7 +517,7 @@ class _BlockManager(object):
                     return
                 self._keep.get(b)
             except Exception:
-                pass
+                _logger.error(traceback.format_exc())
 
     @synchronized
     def start_get_threads(self):