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文档中心弹性 MapReduce EMR 开发指南 Hadoop 开发指南 YARN 作业日志转存 COS

YARN 作业日志转存 COS

最近更新时间：2023-06-27 14:48:57

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Hadoop 默认将 YARN 的作业日志存储在 hdfs 上，腾讯云 EMR 还提供了将 YARN 作业日志存储在外部存储 COS 上。
前提条件
EMR 集群需要支持 COS，详情可参考 使用 API 分析 HDFS/COS 上的数据。
操作步骤
1. 登录 EMR 控制台，在集群列表中选择对应的集群，单击集群服务进入集群服务列表。
2. 通过 YARN 服务面板右上角操作 > 配置管理，找到  yarn-site.xml 配置文件并修改以下配置，下发所有节点。
yarn.nodemanager.remote-app-log-dir=cosn://$bucketname/$logs_dirs
其中，$bucketname 为您的存储桶名，$logs_dirs 为您希望将 yarn 作业日志转存的文件目录。
3. 通过 HDFS 服务面板右上角操作 > 配置管理，找到 core-site.xml 并新增以下配置项，下发所有节点。
fs.AbstractFileSystem.cosn.impl=org.apache.hadoop.fs.cosnative.COS
4. 在集群服务 > HDFS  >  角色管理中重启集群所有 nodemanager/datanode 服务。
5. 运行 hive/spark 作业后，可通过以下命令查看存储在 COS 上的作业日志。
hdfs dfs -ls cosn://$bucketname/$logs_dirs
﻿

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