starting namenodes on [hadoop100] error: attempting to operate on hdfs namen

This error message suggests that there is an issue with starting the Namenode service on the Hadoop cluster, specifically on the "hadoop100" node. The error message indicates that the Namenode service is attempting to operate on the HDFS (Hadoop Distributed File System) namespace, but encountering an issue.

To troubleshoot this issue, you can try the following steps:
1. Check the HDFS logs on the Namenode to see if there are any error messages or stack traces that could provide more information about the issue.
2. Check the Hadoop configuration files (such as core-site.xml, hdfs-site.xml, and yarn-site.xml) to ensure that the Hadoop services are configured correctly and pointing to the correct Namenode.
3. Check the network connectivity between the Namenode and other nodes in the cluster to ensure that they can communicate with each other.
4. Restart the Namenode service and monitor the logs to see if the issue persists.

If none of these steps resolve the issue, you may need to seek further assistance from the Hadoop community or support team.