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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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