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Q: When I trying to create a directory using this command "hadoop fs -mkdir /input_dir" in cmd.exe after successful Hadoop installation. I am gettin this error. I will attach the screenshot, below.

C:\hadoop-2.10.0\sbin>hdfs dfs -mkdir /sample WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.apache.hadoop.security.authentication. util.KerberosUtil (file:/C:/hadoop-2.10.0/share/hadoop/common/lib/hadoop-auth-2. 10.0.jar) to method sun.security.krb5.Config.getInstance() WARNING: Please consider reporting this to the maintainers of org.apache.hadoop. security.authentication.util.KerberosUtil

WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release mkdir: Call From LGNNV1CC to localhost:9870 failed on connection exception: java.net.ConnectException: Connection refused: no further information"

Sara Logan
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1 Answers1

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What does the warning mean?

The program accessed a field/method from another module that was not visible/accessable to it but it made the field/method accessible.

What is the impact?

In fact, it is just a warning. You can just ignore it.

dan1st
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