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Release 2.2 (2025-10-5)

MR3​

MR3-UI​

  • MR3 DAGAppMaster internally runs both an HTTP server and a Timeline Server for MR3-UI, and the user can connect directly to MR3-UI while DAGAppMaster is running.
  • MR3-UI has been completely reimplemented and is no longer based on Tez-UI. It allows the user to check the state of DAGAppMaster, visualize the progress of DAGs, and analyze statistics of DAG executions.

mr3ui.application.2-fs8

Shuffling​

  • tez.runtime.enable.final-merge.in.output is automatically set to the negation of tez.runtime.pipelined-shuffle.enabled.

Hive on MR3​

  • MR3 now supports running both Hive 3 and Hive 4 with either Java 8 or Java 17.