SPARK-27410
Remove deprecated/no-op mllib.Kmeans get/setRuns methods
Remove unneeded direct dependence on Netty 3.x
Redundant javax.activation dependencies in the Maven buildSPARK-27657
ml.util.Instrumentation.logFailure doesn't log error message
Spark 3.0 build warnings: reflectiveCalls edition
Fix build warnings for 3.0: postfixOps edition
Check for JIRA_USERNAME and JIRA_PASSWORD up front in merge_spark_pr.py
multiple simultaneous job submissions against k8s backend cause driver pods to hang
Replace Java shim functional interfaces like java.api.Function with Java 8 equivalents
Spark on K8S Integration Tests timeouts are too short for some test clustersSPARK-27090
Removing old LEGACY_DRIVER_IDENTIFIER ("<driver>")
Snappy 1.1.7.1 fails when decompressing empty serialized data
Use Single-Abstract-Method support in Scala 2.12 to simplify code
Update Thrift to 0.12.0
Implement maxNumConcurrentTasks() in MesosFineGrainedSchedulerBackend
Empty string should be disallowed for data types except for string and binary types in JSONSPARK-26507
Fix core tests for Java 11
Make DecimalType's minimum adjusted scale configurable
Code cleanup from lgtm.com analysis
Fix definition of clustering silhouette coefficient for 1-element clusters
Remove obsolete spark-mesos Docker image
Remove deprecated .newInstance(), primitive wrapper class constructor calls
Resolve most miscellaneous deprecation and build warnings for Spark 3
Remove JavaSparkContextVarargsWorkaround and standardize union() methods
Prevent "purge" to remove needed batch files in CompactibleFileStreamLog
Add JAXB reference impl to build for Java 9+
SizeEstimator can't make some JDK fields accessible in Java 9+
Update JPMML to 1.4.8 for Java 9+
Remove SchedulerExtensionService
Make SparkHadoopUtil private to Spark
Fix scala version string detection when maven-help-plugin is not pre-installed
Remove class SnappyOutputStreamWrapper
Make saveAsTable() and createOrReplaceTempView() return dataframe of created table/ created view
Update to Scala 2.12.8
SPARK-26189
Fix the doc of unionAll in SparkR
Delegation Token seems not appropriately stored on secrets of Kubernetes/Kerberized HDFS
Update plugins, including MiMa
PySpark Bindings for K8S - make Python 3 the default
Support R file extension case-insensitively
Remove outdated Experimental, Evolving annotations
Create Hive Partitioned Table without specifying data type for partition columns will success unexpectedly
Allow Launcher to be applied Java options
Use log1p(x) instead of log(1+x) and expm1(x) instead of exp(x)-1
Fall back to archive.apache.org to download Maven if mirrors don't have requested version
Prevent column name duplication in temporary view
JavaPairRDD flatMapValues requires function returning Iterable, not Iterator
Support specification of column names in INSERT INTO
Add exception for Kafka readstream when decryption fails
NullPointerException when parsing event log with InMemoryStore
Update Xerces to 2.12.0