hadoop兼容性

Compatibility types

Java API

Semantic compatibility

Wire compatibility

Java Binary compatibility for end-user applications i.e. Apache Hadoop ABI

REST APIs

Metrics/JMX

File formats & Metadata

Command Line Interface (CLI)

Web UI

Hadoop Configuration Files

Directory Structure

Java Classpath

Environment variables

Build artifacts

Hardware/Software Requirements

http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/Compatibility.html