I encountered the following two bugs while testing Flink 1.2.0 rc2: Task Manager ID missing from logs link in Job Manager UI https://issues.apache.org/jira/browse/FLINK-5648
KryoException when starting job from Flink 1.2.0 rc0 savepoint https://issues.apache.org/jira/browse/FLINK-5649 The last bug, FLINK-5649, prevents the submission of a job using a savepoint taken with 1.2.0 rc0 and is a blocker for me. Best, --Scott Kidder