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Apache Hadoop 1.3.0 Release Notes

These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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• MAPREDUCE-4049 | Major | plugin for generic shuffle service

Allow ReduceTask loading a third party plugin for shuffle (and merge) instead of the default shuffle.

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• HADOOP-8873 | Major | Port HADOOP-8175 (Add mkdir -p flag) to branch-1

FsShell mkdir now accepts a -p flag. Like unix, mkdir -p will not fail if the directory already exists. Unlike unix, intermediate directories are always created, regardless of the flag, to avoid incompatibilities.

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• MAPREDUCE-5408 | Major | CLONE - The logging level of the tasks should be configurable by the job

Allow logging level of map/reduce tasks to be configurable. Configuration changes: add mapred.map.child.log.level add mapred.reduce.child.log.level

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• HDFS-5685 | Major | DistCp will fail to copy with -delete switch

Has dependency on MAPREDUCE-1285/MAPREDUCE-5698

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• MAPREDUCE-5777 | Major | Support utf-8 text with BOM (byte order marker)

WARNING: No release note provided for this change.

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• HDFS-7312 | Minor | Update DistCp v1 to optionally not use tmp location (branch-1 only)

DistCp v1 currently copies files to a temporary location and then renames that to the specified destination. This can cause performance issues on file systems such as S3. A -skiptmp flag is added to bypass this step and copy directly to the destination.