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Can you refer to this tutorial to ensure:

Following are the configurations files required to be copied over to Druid conf folders:

For HDFS as a deep storage, hdfs-site.xml, core-site.xml
For ingestion, mapred-site.xml, yarn-site.xml

verify configs as per https://support.imply.io/hc/en-us/articles/360035929974-Configuring-Druid-to-use-a-Kerberized-Hadoop-as-Deep-Storage