August 2015
Intermediate to advanced
278 pages
5h 54m
English
Content preview from Learning YARNBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Analyzing transitions through logs
Both YARN services, ResourceManager and NodeManager generate logs and store them in a .log file locally inside the folder specified using the HADOOP_LOGS_DIR variable. By default, the logs are stored in HADOOP_PREFIX/logs. All the state transitions in YARN are recorded in the log files. In this section, we'll cover few state transitions and the logs generated during those transitions.
Note
Setting the log level: Hadoop-YARN uses Apache Log4j library and it uses a log4j.properties file located in the configuration folder of the Hadoop-YARN bundle at HADOOP_PREFIX/etc/hadoop.
The Log4j library supports six log levels – TRACE, DEBUG, INFO, WARN, ERROR, and FATAL. A cluster administrator sets the log level for Hadoop-YARN ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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