27.06.2024 Problem:
The client is experiencing daily automatic restarts of their Cassandra database, potentially causing issues with application connectivity. Additionally, they’re encountering errors related to JVM memory, degraded mode, connection resets by peer, and null pointer exceptions on indexes.
Solution:
After a thorough analysis of the provided logs, the following findings and recommendations were made:
Identify JVM Memory Issue:
- Configure JVM memory settings to prevent memory-related restarts during IO operations.
- Adjust settings in /etc/security/limits.conf or via sysctl.
Address Cassandra Degraded Mode:
- Verify and adjust swap, memory, nofile, and nproc configurations to ensure Cassandra operates optimally without entering degraded mode.
Investigate Connection Reset Errors:
- Analyze the Connection reset by peer errors to determine external factors causing resets.
- Gather information on index schemas and Cassandra cluster architecture for deeper investigation.
Address Null Pointer Exceptions on Indexes:
- Investigate index schemas to ensure proper configuration.
- Verify data type consistency between Cassandra schema and Lucene indexes.
- Gather additional details for a thorough analysis and resolution of null pointer exceptions.
Conclusion:
The expert analysis and recommendations aim to address the reported issues with Cassandra, providing insights into potential causes and actionable steps for resolution. Additional investigation into index schemas and cluster architecture is essential for a comprehensive understanding and effective resolution of the identified errors.