X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/1913b4edcb176909e8cf7ef3272c41bf8f2c7e1a..5a46895af3657b549264a68bd2450baf8dbf7215:/sdk/python/arvados/diskcache.py

diff --git a/sdk/python/arvados/diskcache.py b/sdk/python/arvados/diskcache.py
index 74b2a77b28..f3984bbca4 100644
--- a/sdk/python/arvados/diskcache.py
+++ b/sdk/python/arvados/diskcache.py
@@ -66,6 +66,8 @@ class DiskCacheSlot(object):
             tmpfile = None
 
             self.content = mmap.mmap(self.filehandle.fileno(), 0, access=mmap.ACCESS_READ)
+            # only set the event when mmap is successful
+            self.ready.set()
         finally:
             if tmpfile is not None:
                 # If the tempfile hasn't been renamed on disk yet, try to delete it.