Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/18883#discussion_r136443138 --- 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 -- @srowen This is a breaking change. We should not remove a public class that is in the api docs: http://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.io.LZ4BlockInputStream
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