0.10.0 is the first release on 0.10 line and contains 178 bug fixes and improvements.

Please see CHANGES.txt for more details: https://gitbox.apache.org/repos/asf?p=tez.git;a=blob_plain;f=CHANGES.txt;hb=refs/tags/rel/release-0.10.0
List of issues fixed in 0.10.0: https://issues.apache.org/jira/projects/TEZ/versions/12343160