The Apache Hadoop community has voted to end the release line of 2.9.x. (Vote thread: https://s.apache.org/ApacheHadoop2.9EOLVote)
The first 2.9 release, 2.9.0 was released on 12/17/2017 The last 2.9 release, 2.9.2, was released on 1/19/2018 Existing 2.9.x users are encouraged to upgrade to newer release lines: 2.10.0 / 3.1.4 / 3.2.1 / 3.3.0. Please check out our Release EOL wiki for details: https://cwiki.apache.org/confluence/display/HADOOP/EOL+(End-of-life)+Release+Branches Best Regards, Wei-Chiu Chuang (On Behalf of the Apache Hadoop PMC)