By deleting or renaming the state folder, you essentially reset the internal state of NiFi, forcing it to reinitialize and re-establish cluster coordination. However, it's worth noting that taking this action can result in some data loss or disruption in the cluster, so it should be used cautiously and as a last resort.
Here are the general steps to perform this operation:
1. Stop NiFi on all nodes in the cluster: Ensure that NiFi is completely stopped on all nodes before proceeding.
2.
Locate
the state folder: The state
folder is typically located in the NiFi's state directory, which is often defined in the state-management.xml file. You can navigate to the state folder and
either delete it or rename it to something like "state_backup" as a
precaution.
Shell:
rm-
-rf /state
3. Restart NiFi on all nodes: After deleting or renaming the state folder, start NiFi on all nodes in the cluster.
4. Monitor the cluster: Keep an eye on the NiFi cluster to ensure that it successfully initializes and that all nodes join the cluster.
This process essentially resets the internal state of NiFi and can help resolve issues related to cluster coordination. However, it should be used with caution, as it may result in the loss of some historical state information.
Before proceeding with such actions, it's advisable to back up any critical data and configurations, and it's also a good practice to consult NiFi documentation and any relevant cluster troubleshooting resources to understand the potential implications of resetting the state folder in your specific environment.