kezhenxu94 commented on a change in pull request #29:
URL: https://github.com/apache/skywalking-python/pull/29#discussion_r448454910



##########
File path: skywalking/trace/carrier/__init__.py
##########
@@ -74,14 +74,26 @@ def val(self, val: str):
         if not val:
             return
         parts = val.split('-')
+        if len(parts) != 8:
+            return
         self.trace_id = b64decode(parts[1])
         self.segment_id = b64decode(parts[2])
-        self.span_id = int(parts[3])
+        self.span_id = int(parts[3]) if parts[3].isnumeric() else -1

Review comment:
       > Use a default -1 span could be mislinking the parent.
   
   If it falls back to `-1`, the `is_valid` always return false, and there's no 
chance that the carrier is used, anyway, just update the commit to dismiss the 
concern




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