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https://issues.apache.org/jira/browse/SPARK-60461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-60461:
-----------------------------------
Labels: pull-request-available (was: )
> Restore Strategy constructor binary compatibility
> -------------------------------------------------
>
> Key: SPARK-60461
> URL: https://issues.apache.org/jira/browse/SPARK-60461
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Affects Versions: 4.3.0
> Reporter: Ruifeng Zheng
> Priority: Major
> Labels: pull-request-available
>
> SPARK-34591 / apache/spark#55763 inserted pruneTree before bootstrap in the
> primary constructor of org.apache.spark.mllib.tree.configuration.Strategy.
> This changed the JVM constructor from 15 to 16 parameters. A Scala client
> compiled against Spark 4.2.0, such as new Strategy(Algo.Classification, Gini,
> maxDepth = 3), fails with NoSuchMethodError on the current 4.3 branch.
> The insertion also changed constructor default getter 15 from bootstrap=false
> to pruneTree=true. Adding only a compatibility overload would therefore
> silently change the behavior of previously compiled callers that use defaults.
> Restore the original 15-argument constructor as an overload delegating with
> pruneTree=true, and retain bootstrap in its original parameter position in
> the primary constructor. Update Strategy.copy to pass pruneTree by name and
> remove the MiMa exclusion for Strategy.this. Add regression tests for the old
> constructor signature, bootstrap default getter, and independent
> pruning/bootstrapping configuration.
> The fix was verified by compiling a client against the published Spark 4.2.0
> artifact and running it against both 4.2.0 and the patched class. The
> regression suite's three tests pass. The patch applies cleanly to branch-4.3.
> Backports are intended for branch-4.x and branch-4.3.
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