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Editor to share with you how to upgrade hadoop2.5.2 hadoop2.6.0, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

To upgrade hadoop, close hadoop directly first.

# stop-dfs.sh

After each machine is installed and configured with hadoop 2.6.0, it will start up with an error. Prompt to use-rollingUpgrade started upgrade successfully after using the following command

# hdfs namenode-rollingUpgrade started

There will be a lot of converted debug information during the upgrade process. Namenode and datanode will be started after completion. Log in to the background interface and you will find that the version has become 2.6.0.

Terminate with ctrl+c. Start hdfs using start-dfs.sh

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