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https://issues.apache.org/jira/browse/SPARK-31168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun reassigned SPARK-31168:
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Assignee: Dongjoon Hyun
> Upgrade Scala to 2.12.13
> ------------------------
>
> Key: SPARK-31168
> URL: https://issues.apache.org/jira/browse/SPARK-31168
> Project: Spark
> Issue Type: Sub-task
> Components: Build
> Affects Versions: 3.2.0
> Reporter: Yuming Wang
> Assignee: Dongjoon Hyun
> Priority: Major
>
> h2. Highlights
> * Performance improvements in the collections library: algorithmic
> improvements and changes to avoid unnecessary allocations ([list of
> PRs|https://github.com/scala/scala/pulls?q=is%3Apr+milestone%3A2.12.11+is%3Aclosed+sort%3Acreated-desc+label%3Alibrary%3Acollections+label%3Aperformance])
> * Performance improvements in the compiler ([list of
> PRs|https://github.com/scala/scala/pulls?q=is%3Apr+milestone%3A2.12.11+is%3Aclosed+sort%3Acreated-desc+-label%3Alibrary%3Acollections+label%3Aperformance+],
> minor [effects in our
> benchmarks|https://scala-ci.typesafe.com/grafana/dashboard/db/scala-benchmark?orgId=1&from=1567985515850&to=1584355915694&var-branch=2.12.x&var-source=All&var-bench=HotScalacBenchmark.compile&var-host=scalabench@scalabench@])
> * Improvements to {{-Yrepl-class-based}}, an alternative internal REPL
> encoding that avoids deadlocks (details on
> [#8712|https://github.com/scala/scala/pull/8712])
> * A new {{-Yrepl-use-magic-imports}} flag that avoids deep class nesting in
> the REPL, which can lead to deteriorating performance in long sessions
> ([#8576|https://github.com/scala/scala/pull/8576])
> * Fix some {{toX}} methods that could expose the underlying mutability of a
> {{ListBuffer}}-generated collection
> ([#8674|https://github.com/scala/scala/pull/8674])
> h3. JDK 9+ support
> * ASM was upgraded to 7.3.1, allowing the optimizer to run on JDK 13+
> ([#8676|https://github.com/scala/scala/pull/8676])
> * {{:javap}} in the REPL now works on JDK 9+
> ([#8400|https://github.com/scala/scala/pull/8400])
> h3. Other changes
> * Support new labels for creating durations for consistency:
> {{Duration("1m")}}, {{Duration("3 hrs")}}
> ([#8325|https://github.com/scala/scala/pull/8325],
> [#8450|https://github.com/scala/scala/pull/8450])
> * Fix memory leak in runtime reflection's {{TypeTag}} caches
> ([#8470|https://github.com/scala/scala/pull/8470]) and some thread safety
> issues in runtime reflection
> ([#8433|https://github.com/scala/scala/pull/8433])
> * When using compiler plugins, the ordering of compiler phases may change
> due to [#8427|https://github.com/scala/scala/pull/8427]
> For more details, see [https://github.com/scala/scala/releases/tag/v2.12.11].
>
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