Apache Kafka is a distributed event streaming platform used by thousands of companies for high-performance data pipelines, streaming analytics, data integration, and mission-critical applications. Zookeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. It is a critical component of Kafka, ensuring the coordination and management of Kafka brokers.
When working with Kafka Zookeeper, you may encounter the INVALID_ACL
error. This error typically manifests when attempting to access or modify a Zookeeper node, resulting in a failure message indicating that the Access Control List (ACL) is invalid.
The INVALID_ACL
error occurs when the specified ACL for a Zookeeper node is not valid. ACLs in Zookeeper are used to control access to nodes, specifying which users or systems can perform operations on them. An invalid ACL can result from incorrect syntax, unsupported permissions, or misconfigured user credentials.
ACLs in Zookeeper are composed of a scheme, an ID, and a set of permissions. Common schemes include world
, auth
, digest
, and ip
. Each scheme has specific requirements and formats. For example, the digest
scheme requires a username and password hash.
To resolve the INVALID_ACL
error, follow these steps:
First, review the current ACLs set on the node. You can use the Zookeeper CLI to list the ACLs:
zkCli.sh -server localhost:2181
getAcl /path/to/node
This command will display the current ACLs for the specified node.
Ensure that the ACL syntax is correct. Refer to the Zookeeper Access Control documentation for valid ACL formats and examples.
If you identify any invalid ACLs, correct them using the following command:
setAcl /path/to/node scheme:id:permissions
Replace scheme:id:permissions
with the correct values. For example, to set a digest ACL, use:
setAcl /path/to/node digest:user:passwordhash:cdrwa
For further reading and examples, consider the following resources:
By following these steps and utilizing the resources provided, you should be able to resolve the INVALID_ACL
error and ensure proper access control in your Kafka Zookeeper setup.
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