This document lists features that are not backward compatible.
Alluxio journal needs to be upgraded manually when upgrading Alluxio cluster to >= 1.5.0 from any Alluxio cluster < 1.5.0 by running the following commands in the home directory of the new cluster.
# Back up the v0 journal to avoid losing data in case of failures while running journal upgrader. cp -r YourJournalDirectoryV0 YourJournalBackupDirectory # Upgrade the journal. ./bin/alluxio upgradeJournal -journalDirectoryV0 YourJournalDirectoryV0
Alluxio client and server
Alluxio 1.5.0 introduces a new data transfer protocol between the client and Alluxio workers which makes Alluxio client and server incompatible with Alluxio clusters < 1.5.0. So the Alluxio client and server needs to be upgraded together when upgrading Alluxio cluster to >= 1.5.0 from Alluxio cluster < 1.5.0.