release 0.22.0 available
This release contains many bug fixes and optimizations compared to its
predecessor 0.21.0. See the Hadoop 0.22.0 Release
Notes for
details. Alternatively, you can look at the complete change log for
this release
Notes:
The following features are not supported in Hadoop 0.22.0.
- Security.
- Latest optimizations of the MapReduce framework introduced in the
Hadoop 0.20.security line of releases.
- Disk-fail-in-place.
- JMX-based metrics v2.
Hadoop 0.22.0 features
- HBase support with
hflush and hsync.
- New implementation of file append.
- Symbolic links.
- BackupNode and CheckpointNode.
- Hierarchical job queues.
- Job limits per queue/pool.
- Dynamically stop/start job queues.
- Andvances in new mapreduce API: Input/Output formats,
ChainMapper/Reducer.
- TaskTracker blacklisting.
- DistributedCache sharing.
2011 Dec 10