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[docs] Document the successive Python job limitation on a session cluster - #1282
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Thanks for taking this on. LGTM
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Linked issue: #1281
Purpose of change
Document the known limitation of successive Flink Agents jobs that use the Python runtime on a session cluster (#943, #1281), including Java jobs with Python components. Setup tells users to restart the cluster before submitting another such job and lists the startup errors seen when the distribution JAR isn't in
$FLINK_HOME/lib. The Quickstart overview links to it. This replaces the earlier parent-first recommendation.Tests
The docs build with Hugo 0.110.0, and the new anchor and the Quickstart link to it resolve. The reproductions are in #1281; on macOS with main and stock pemja, restarting the cluster let a first job produce output again.
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