Zookeeper Cluster Synchronization Issue Troubleshooting Guide

Owned by Nikhil Mulinti
Jun 20, 2024
2 min read

Zookeeper Cluster Synchronization Issue Troubleshooting Guide

This document outlines the steps to troubleshoot and resolve synchronization issues in a Zookeeper cluster. It details how to set the myid file correctly, clear the data directory, and ensure all nodes are properly synchronized.

Step-by-Step Procedure

1. Verify and Correct the myid File

  1. Check the myid File:

    kubectl exec -it <zookeeper-pod-name> -n <namespace> -- cat /var/lib/zookeeper/data/myid

    Ensure the myid file for each node matches the corresponding server number in the zoo.cfg configuration.

  2. Update the myid File if necessary:

    kubectl exec -it <zookeeper-pod-name> -n <namespace> -- sh -c 'echo <id> > /var/lib/zookeeper/data/myid'

    Replace <zookeeper-pod-name> with the name of the Zookeeper pod, <namespace> with the namespace, and <id> with the correct server ID.

2. Clear the Data Directory

  1. Clear the Data Directory:

    kubectl exec -it <zookeeper-pod-name> -n <namespace> -- rm -rf /var/lib/zookeeper/data/*

  2. Restart the Zookeeper Pod:

3. Verify Zookeeper Pod Status

  1. Check the Status of the Restarted Pod:

  2. Verify Cluster Synchronization:
    Repeat the status check for all Zookeeper nodes to ensure they are synchronized.

4. Verify Cluster Health

  • Leader-Follower Roles: Ensure one node is the leader and others are followers.

  • Zxid Values: Ensure all nodes have similar zxid values, indicating synchronization.

Additional Steps for Kafka Integration Issues

If the issue involves Kafka and Zookeeper integration, follow these additional steps:

  1. Check Kafka Configuration:
    Ensure the zookeeper.connect property in the Kafka broker configuration points to the correct Zookeeper ensemble.

  2. Verify meta.properties:

    • Locate the meta.properties file in the Kafka data directory.

    • Verify the cluster.id matches the cluster ID retrieved from Zookeeper.

  3. Synchronize Cluster IDs if necessary:

    • Reset the Kafka data directories if there are mismatches.

    • Restart Kafka brokers.

Commands