Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/18883#discussion_r136448647
--- Diff: project/MimaExcludes.scala ---
@@ -41,7 +41,10 @@ object MimaExcludes {
// [SPARK-19937] Add remote bytes read to disk.
ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.spark.status.api.v1.ShuffleReadMetrics.this"),
-
ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.spark.status.api.v1.ShuffleReadMetricDistributions.this")
+
ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.spark.status.api.v1.ShuffleReadMetricDistributions.this"),
+
+ // [SPARK-21276] Update lz4-java to the latest (v1.4.0)
+
ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.io.LZ4BlockInputStream")
--- End diff --
It's "public" only insofar as it has to be in Java to use it this way.
There's no case where a user should or would use this class directly.
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