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hadoop-common-project/hadoop-common/src/site/markdown/release/2.7.1/RELEASENOTES.2.7.1.md

2.0.5-alpha-rc21.8 KB
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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
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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.