Apache Hadoop 3.0.1 发布，bug 修复和性能增强

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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。

转自 https://ift.tt/2G6lHMM

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