Apache Hadoop 2.7.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
- HDFS-8226 | Blocker | Non-HA rollback compatibility broken
Non-HA rollback steps have been changed. Run the rollback command on the namenode (`bin/hdfs namenode -rollback`) before starting cluster with ‘-rollback’ option using (sbin/start-dfs.sh -rollback).
- HDFS-8486 | Blocker | DN startup may cause severe data loss
Public service notice:
- Every restart of a 2.6.x or 2.7.0 DN incurs a risk of unwanted block deletion.
- Apply this patch if you are running a pre-2.7.1 release.
- HDFS-8270 | Major | create() always retried with hardcoded timeout when file already exists with open lease
Proxy level retries will not be done on AlreadyBeingCreatedExeption for create() op.
