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How will you replace HDFS data volume before shutting down a DataNode?

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In HDFS, DataNode supports hot swappable drives. With a swappable drive we can add or replace HDFS data volumes while the DataNode is still running.

The procedure for replacing a hot swappable drive is as follows:

 

First we format and mount the new drive.

We update the DataNode configuration dfs.datanode.data.dir to reflect the data volume directories.

Run the "dfsadmin -reconfig datanode HOST:PORT start" command to start the reconfiguration process Once the reconfiguration is

complete, we just unmount the old data volume

After unmount we can physically remove the old disks.

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