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E-MapReduce:Release notes of EMR V3.27.X

Last Updated:Apr 27, 2023

This topic describes the release notes of E-MapReduce (EMR) V3.27.X, including release dates, new features, and updates.

Release dates

VersionRelease date
EMR V3.27.0April 29, 2020
EMR V3.27.1May 8, 2020
EMR V3.27.2May 20, 2020

New features

FeatureDescription
Custom component deploymentComponents on the master node can be customized. The following components are supported:
  • Hadoop
  • Spark
  • Hive
  • Zookeeper
  • Presto
Graceful release during auto scalingGraceful release during auto scaling is supported. After you enable graceful release, the nodes that are removed during a scale-in are not immediately released. Instead, they are released after tasks are completed within the specified period of time.

Updates

ComponentDescription
Spark
  • Partition fields of the date type are supported in the cube.
  • The stack depth in the spark-submit scripts is increased.
Delta
  • DDL statements, including CREATE, SHOW, and DESCRIBE, are enhanced.
  • The OPTIMIZE statement for Z-order is supported.
Knox
  • Information on the web UI of Druid can be viewed.
  • Deployment on multiple master nodes is supported.
Hive
  • The magic committer in an HCatalog table is supported.
  • Some outdated default configurations are removed.
Bigboot
  • Bigboot is updated to 2.6.3.
  • Deployment on multiple master nodes is supported.
SmartData
  • SmartData is updated to 2.6.3.
  • Deployment on multiple master nodes is supported.
Ranger
  • Solr is supported.
  • PrestoSQL 311 is supported.
TezThe ScratchDir option can be used to specify a temporary directory in OSS.
PrestoPresto is updated to 331.
DruidDruid is updated to 0.17.1.
SupersetSuperset is updated to 0.35.2.
Sqoop
  • The MySQL JDBC JAR package is updated to 5.1.48.
  • Custom encoding is supported by using --mysql-charset in MySQL direct export mode.