wjszlachta-man opened a new pull request, #53306:
URL: https://github.com/apache/spark/pull/53306
### What changes were proposed in this pull request?
On glibc based Linux systems `select()` can monitor only file descriptor
numbers that are less than `FD_SETSIZE` (1024).
This is an unreasonably low limit for many modern applications.
This PR replaces `select.select()` with `select.poll()` when running on
POSIX os.
### Why are the changes needed?
When running via `pyspark` we frequently observe:
```
Exception occurred during processing of request from ('127.0.0.1', 46334)
Traceback (most recent call last):
File "/usr/lib/python3.11/socketserver.py", line 317, in
_handle_request_noblock
self.process_request(request, client_address)
File "/usr/lib/python3.11/socketserver.py", line 348, in process_request
self.finish_request(request, client_address)
File "/usr/lib/python3.11/socketserver.py", line 361, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/lib/python3.11/socketserver.py", line 755, in __init__
self.handle()
File "/usr/lib/python3.11/site-packages/pyspark/accumulators.py", line
293, in handle
poll(authenticate_and_accum_updates)
File "/usr/lib/python3.11/site-packages/pyspark/accumulators.py", line
266, in poll
r, _, _ = select.select([self.rfile], [], [], 1)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: filedescriptor out of range in select()
```
On POSIX systems `poll()` should be used instead of `select()`.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Existing unit tests + we have been running this change (combined with
https://github.com/py4j/py4j/pull/560) on our YARN cluster (Linux) since April
2025.
### Was this patch authored or co-authored using generative AI tooling?
No
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