What about the warning when starting and shutting down Hadoop?

This article will explain in detail how to start and close Hadoop warnings, Xiaobian thinks it is quite practical, so share it with you for a reference, I hope you can gain something after reading this article.

Eclipse associated Hadoop source code

Create a JAVA project and add the following folder to the src directory under $HADOOP_HOME/src:

core, hdfs, mapred

Error reported after import due to lack of jar package. The following jar packages need to be imported:

All jar packages in the $HADOOP_HOME/lib directory

All jar packages in the $HADOOP_HOME/lib/jsp-2.1 directory

ant.jar

Error import.sun. net.util.IPAddressUtil for DFSClient.java

Error reason: sun is private at the beginning, some APIs that are not public are used to develop JDK.

Workaround: Libby replaces JDK on the property page

Warning: $HADOOP_HOME is deprecated

Look at hadoop-config.sh under $HADOOP_HOME/bin, the key code is shown below:

The solution is therefore as follows:

Add export HADOOP_HOME_WARN_SUPPRESS=1 to/etc/profile file

Execute source /etc/profile

Restart Hadoop Problem Solving

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