Shixiong Zhu created SPARK-30936:
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Summary: Fix the broken forwards-compatibility in JsonProtocol
Key: SPARK-30936
URL: https://issues.apache.org/jira/browse/SPARK-30936
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 3.0.0
Reporter: Shixiong Zhu
JsonProtocol is supposed to provide strong backwards-compatibility and
forwards-compatibility guarantees: any version of Spark should be able to read
JSON output written by any other version, including newer versions.
However, the forwards-compatibility guarantee is broken for events parsed by
"ObjectMapper". If a new field is added to an event parsed by "ObjectMapper"
(e.g.,
https://github.com/apache/spark/commit/6dc5921e66d56885b95c07e56e687f9f6c1eaca7#diff-dc5c7a41fbb7479cef48b67eb41ad254R33),
this event cannot be parsed by an old version of Spark History Server.
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