Josh Rosen created SPARK-39636:
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Summary: Fix multiple small bugs in JsonProtocol, impacting
StorageLevel and Task/Executor resource requests
Key: SPARK-39636
URL: https://issues.apache.org/jira/browse/SPARK-39636
Project: Spark
Issue Type: Improvement
Components: Spark Core, Web UI
Affects Versions: 1.0.0
Reporter: Josh Rosen
Assignee: Josh Rosen
While working on SPARK-39489, I spotted three pre-existing bugs in JsonProtocol:
* {{TaskResourceRequest}} loses precision for values < 0.5. The {{amount}} is
a floating point number which is either between 0 and 0.5 or is a positive
integer, but the read path assumes it is an integer.
* {{ExecutorResourceRequest}} integer overflows for values larger than an
integer because the write path writes longs but the read path assumes integers.
* The {{OFF_HEAP}} storage level is not handled properly: the {{offHeap}}
field isn't included in the JSON, so this StorageLevel cannot be round-tripped
through JSON. This could cause the History Server to display inaccurate "off
heap memory used" stats on the executors page.
I'm submitting a separate PR to fix those issues.
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