7.8. Downgrade HDFS JournalNode(s)

Downgrade each JournalNode process, one by one. The order does not matter.

Stop the JournalNode process, switch to the previous version, and start the process:

su - hdfs -c "/usr/hdp/current/hadoop-hdfs-journalnode/../hadoop/sbin/hadoop-daemon.sh stop journalnode"

hdp-select set hadoop-hdfs-journalnode

/su - hdfs -c "/usr/hdp/current/hadoop-hdfs-journalnode/../hadoop/sbin/hadoop-daemon.sh start journalnode"

See Appendix A for HDFS validation tasks.

Continue with the next downgrade step.

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