kushmiD opened a new pull request, #32972:
URL: https://github.com/apache/beam/pull/32972
Apache Beam does the following:
- Pickle Python code
- Send the pickled source code to "worker" VMs
- The workers unpickle and execute the code
In the environment that these Beam pipelines execute, the source code is in
a temporary directory whose name is random and changes. The source code paths
relative to the temporary directory are constant. Using absolute paths prevents
pickled code from being cached because the absolute path keeps changing. Using
relative paths enables this caching and promises significant resource savings
and speed-ups.
Additionally the absolute paths leak information about the directory
structure of the machine pickling the source code. When the pickled code is
passed across the network to another machine, the absolute paths may no longer
be valid when the other machine has a different directory structure.
The reason for using relative paths rather than omitting the path entirely
is because Python uses the co_filename attribute to create stack traces.
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