Help Center/ MapReduce Service/ Component Operation Guide (Paris Region)/ Using Yarn/ Common Issues About Yarn/ Why Does a MapReduce Job Fail to Run When a Non-ViewFS File System Is Configured as ViewFS?
Updated on 2022-02-22 GMT+08:00

Why Does a MapReduce Job Fail to Run When a Non-ViewFS File System Is Configured as ViewFS?

Question

Why does a MapReduce job fail to run when a non-ViewFS file system is configured as ViewFS?

Answer

When a non-ViewFS file system is configured as a ViewFS using cluster, the user permissions on folders in the ViewFS file system are different from those of non-ViewFS folders in the default NameService. The submitted MapReduce job fails to be executed because the directory permissions are inconsistent.

When configuring the ViewFS user in the cluster, you need to check and verify the directory permissions. Before submitting a job, change the ViewFS folder permissions based on the default NameService folder permissions.

The following table lists the default permission structure of directories configured in ViewFS. If the configured directory permissions are not included in the following table, you must change the directory permissions accordingly.

Table 1 Default permission structure of directories configured in ViewFS

Parameter

Description

Default Value

Default value and default permissions on the parent directory

yarn.nodemanager.remote-app-log-dir

On the default file system (usually HDFS), specify the directory to which the NM aggregates logs.

logs

777

yarn.nodemanager.remote-app-log-archive-dir

Directory for archiving logs

-

777

yarn.app.mapreduce.am.staging-dir

Staging directory used when a job is submitted

/tmp/hadoop-yarn/staging

777

mapreduce.jobhistory.intermediate-done-dir

Directory for storing historical files of MapReduce jobs

${yarn.app.mapreduce.am.staging-dir}/history/done_intermediate

777

mapreduce.jobhistory.done-dir

Directory of historical files managed by the MR JobHistory Server.

${yarn.app.mapreduce.am.staging-dir}/history/done

777