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Timers were failing due to prism not actually sending the correct "is_last" messages to the SDK side.

This was caught by the Java SDK looking up each stream explicitly and failing at the "empty" timer family prism was sending.

Python had the subtle issue of hanging during the timer clear test. This test now passes, so the override has been removed.

Fixes #32221


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R: @damondouglas

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Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

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Friendly ping @damondouglas

@lostluck lostluck added this to the 2.59.0 Release milestone Aug 20, 2024
@lostluck lostluck merged commit 05b1781 into apache:master Aug 20, 2024
@lostluck lostluck deleted the beam32221 branch August 20, 2024 22:27
reeba212 pushed a commit to reeba212/beam that referenced this pull request Dec 4, 2024
…rm pair. (apache#32223)

* [apache#32221] Mark is-last for each timer stream correctly.

* Remove test override for clear, since it now passes unmodified.

* delint

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Co-authored-by: lostluck <13907733+lostluck@users.noreply.github.com>
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[prism] Java timer families cannot be looked up SDK side (prism re-write issue)

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