HADOOP YARN（2）：YARN资源调度器(2)入门

5 Yarn常用命令

Yarn状态的查询，除了可以在hadoop103:8088页面查看外，还可以通过命令操作。常见的命令操作如下所示：

需求：执行WordCount案例，并用Yarn命令查看任务运行情况。

[atguigu@hadoop102 hadoop-3.1.3]$ myhadoop.sh start

[atguigu@hadoop102 hadoop-3.1.3]$ hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-3.1.3.jar wordcount /input /output

5.1 yarn application查看任务

（1）列出所有Application：

[atguigu@hadoop102 hadoop-3.1.3]$ yarn application -list
2021-02-06 10:21:19,238 INFO client.RMProxy: Connecting to ResourceManager at hadoop103/192.168.10.103:8032
Total number of applications (application-types: [], states: [SUBMITTED, ACCEPTED, RUNNING] and tags: []):0
                Application-Id        Application-Name        Application-Type          User         Queue                 State           Final-State           Progress                           Tracking-URL

（2）根据Application状态过滤：yarn application -list -appStates （所有状态：ALL、NEW、NEW_SAVING、SUBMITTED、ACCEPTED、RUNNING、FINISHED、FAILED、KILLED）

[atguigu@hadoop102 hadoop-3.1.3]$ yarn application -list -appStates FINISHED
2021-02-06 10:22:20,029 INFO client.RMProxy: Connecting to ResourceManager at hadoop103/192.168.10.103:8032
Total number of applications (application-types: [], states: [FINISHED] and tags: []):1
                Application-Id        Application-Name        Application-Type          User         Queue                 State           Final-State           Progress                           Tracking-URL
application_1612577921195_0001              word count               MAPREDUCE       atguigu       default              FINISHED             SUCCEEDED               100%    http://hadoop102:19888/jobhistory/job/job_1612577921195_0001

（3）Kill掉Application：

[atguigu@hadoop102 hadoop-3.1.3]$ yarn application -kill application_1612577921195_0001
2021-02-06 10:23:48,530 INFO client.RMProxy: Connecting to ResourceManager at hadoop103/192.168.10.103:8032
Application application_1612577921195_0001 has already finished

5.2 yarn logs查看日志

5.3 yarn applicationattempt查看尝试运行的任务

（1）列出所有Application尝试的列表：yarn applicationattempt -list <ApplicationId>

5.4 yarn container查看容器

（1）列出所有Container：yarn container -list <ApplicationAttemptId>

[atguigu@hadoop102 hadoop-3.1.3]$ yarn container -list appattempt_1612577921195_0001_000001
2021-02-06 10:28:41,396 INFO client.RMProxy: Connecting to ResourceManager at hadoop103/192.168.10.103:8032
Total number of containers :0
                  Container-Id              Start Time             Finish Time                   State                    Host       Node Http Address    

5.5 yarn node查看节点状态

列出所有节点：yarn node -list -all

5.6 yarn rmadmin更新配置

加载队列配置：yarn rmadmin -refreshQueues

[atguigu@hadoop102 hadoop-3.1.3]$ yarn rmadmin -refreshQueues
2021-02-06 10:32:03,331 INFO client.RMProxy: Connecting to ResourceManager at hadoop103/192.168.10.103:8033

5.7 yarn queue查看队列

打印队列信息：yarn queue -status <QueueName>

[atguigu@hadoop102 hadoop-3.1.3]$ yarn queue -status default
2021-02-06 10:32:33,403 INFO client.RMProxy: Connecting to ResourceManager at hadoop103/192.168.10.103:8032
Queue Information : 
Queue Name : default
    State : RUNNING
    Capacity : 100.0%
    Current Capacity : .0%
    Maximum Capacity : 100.0%
    Default Node Label expression : <DEFAULT_PARTITION>
    Accessible Node Labels : *
    Preemption : disabled
    Intra-queue Preemption : disabled

6 Yarn生产环境核心参数