thinker0 commented on code in PR #3830:
URL: https://github.com/apache/incubator-heron/pull/3830#discussion_r887840888
##########
heron/tools/tracker/src/python/topology.py:
##########
@@ -589,30 +601,31 @@ def _update(
scheduler_location=...,
) -> None:
"""Atomically update this instance to avoid inconsistent reads/writes from
other threads."""
Review Comment:
```
heron update lad/www/beta heron-system-access-prometheus
--component-parallelism parser:1
heron update lad/www/beta heron-system-access-prometheus
--component-parallelism parser:2
```
Lock is required because the above ```_update``` is executed at the same
time when instance update occurs.
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