IOException All datanodes are bad

Question

Hi Guys,

I am trying to read files from HDFS Cluster. But it is throwing the below error.

"IOException: All datanodes are bad"

Answer 1

Hi@akhtar,

As we know HDFS works in a distributed manner, it means all the files are uploaded in different DataNodes. But in your case, the data nodes are corrupted or in the stopped state. So you need to start the DataNodes. Otherwise, you are not able to see your files.