Apache Hadoop 3.0.1 版本正式发布，属于 3.0 版本线，包含了 42 处 bug 修复和性能加强。 请注意：NameNode 的默认 RPC 端口改回了 8020（在 3.0.0 版本中为 9820） HADOOP-15027 AliyunOSS: Support multi-thread pre-read to improve sequential read from Hadoop to Aliyun OSS performance: Support multi-thread pre-read in AliyunOSSInputStream to improve the sequential read performance from Hadoop to Aliyun OSS. HDFS-12528 Add an option to not disable short-circuit reads on failures: Added an option to not disables short-circuit reads on failures, by setting dfs.domain.socket.disable.interval.seconds to 0. HDFS-13083 RBF: Fix doc error setting up client: Fix the document error of setting up HFDS Router Federation 其他说明见 release notes 和 changelog。 建议 2.x 用户升级到 3.0.1+，以减少更改默认 NN RPC 端口造成的负担。 Apache Hadoop 3.0.1 发布，bug 修复和性能增强下载地址
