Where can I find Hadoop logs?

The default directory of Hadoop log file is $HADOOP_HOME/logs (i.e. log directory in Hadoop home directory).

How do I view HDFS logs?

Click on HDFS —-> Configs ——-> type log in filter box. The picture below shows how to locate log directory for Apache Oozie using grep command of Unix. log directories will have three types of files . Logs of running daemons will be available here in this .

How do I list users in Hadoop?

We can find the list of users in linux and Hadoop as well:

  1. List of users in Linux: awk -F’:’ ‘{ print $1}’ /etc/passwd.
  2. List of user in hadoop: Go to Hue: Look for user admin tab like hive & pig tabs in Hue.
  3. Check the users in HDFS:

Where are YARN application logs stored?

Resource Manager and Node Manager log files

Distribution Default location for Resource Manager and Node Manager log files
Hortonworks /var/log/hadoop-yarn/yarn
Cloudera /var/log/hadoop-yarn
BigInsights /var/log/hadoop-yarn

How can I check my HDFS status?

​Verify HDFS Filesystem Health

  1. Run the fsck command on namenode as $HDFS_USER: su – hdfs -c “hdfs fsck / -files -blocks -locations > dfs-new-fsck-1.log”
  2. Run hdfs namespace and report.
  3. Compare the namespace report before the upgrade and after the upgrade.
  4. Verify that read and write to hdfs works successfully.

What is user in Hadoop?

Since Hadoop doesn’t have the concept of a user identity, there’s no fixed super user for Hadoop. The system super user for Hadoop is simply the operating system user that starts the NameNode. The HDFS super user doesn’t have to be the root user of the NameNode host.

What is HDFS dfs command?

In Hadoop, hdfs dfs -find or hadoop fs -find commands are used to get the size of a single file or size for all files specified in an expression or in a directory. By default, it points to the current directory when the path is not specified. $hadoop fs -find / -name test -print or $hdfs dfs -find / -name test -print.

How do you check yarn logs in Hadoop?

Accessing YARN logs

  1. Use the appropriate Web UI:
  2. In the YARN menu, click the ResourceManager Web UI quick link.
  3. The All Applications page lists the status of all submitted jobs.
  4. To show log information, click on the appropriate log in the Logs field at the bottom of the Applications page.

How do you list yarn logs?

2 Answers

  1. Using Yarn Logs: In logs you can see tracking URL: http://:8088/proxy/application_*****/
  2. Using yarn application command: Use yarn application –list command to get all the running yarn applications on the cluster then use.

What is JPS command in Hadoop?

JPS is a type of command that is implemented to check out all the Hadoop daemons like DataNode, NodeManager, NameNode, and ResourceManager that are currently running on the machine. JPS command is used to check if a specific daemon is up or not.