Bug 1124269 - Retry parse-log tasks sooner

Currently parse-log tasks retry after 10 minutes. With this change, the
first retry is now after 1 minute, then the time for each subsequent
retry lengthens by a further minute each time.

treeherder/log_parser/tasks.py

@@ -89,7 +89,8 @@ def parse_log(project, job_log_url, job_guid, check_errors=False):
                 'parse_timestamp': current_timestamp
             }
         )
-        # for every retry, set the countdown to 10 minutes
+        # Initially retry after 1 minute, then for each subsequent retry
+        # lengthen the retry time by another minute.
+        parse_log.retry(exc=e, countdown=(1 + parse_log.request.retries) * 60)
         # .retry() raises a RetryTaskError exception,
         # so nothing below this line will be executed.
-        parse_log.retry(exc=e, countdown=10*60)