0.8.5 is a release on the 0.8 line, which brought in support for external service to Tez (TEZ-2003). The APIs for external services continue to be unstable in this release, and can change in future version. All fixes from previous releases - 0.5.4, 0.6.1, 0.7.1, 0.8.4 are part of this release. Major changes 1) Support for co-ordinating and running DAGs for external services. 2) Addition of tez-ui2 Please see CHANGES.txt for more details: https://git-wip-us.apache.org/repos/asf/tez/repo?p=tez.git;a=blob_plain;f=CHANGES.txt;hb=refs/tags/rel/release-0.8.5 List of issues fixed in 0.8.4: https://issues.apache.org/jira/browse/TEZ/fixforversion/12337840