Hi @Muhammed, The GC (Allocation Failure) error you’re encountering is related to memory allocation within the Java Virtual Machine (JVM). When the JVM can’t allocate memory for an object due to insufficient space in the Young Generation heap, it triggers a Minor GC to free up memory. If that doesn’t suffice, a Full GC is initiated.
Here are some steps to address this issue:
Memory Configuration:
- Ensure that your JVM memory settings are appropriately configured. You might need to allocate more memory to avoid frequent garbage collection.
- Consider adjusting the heap size parameters (-Xms and -Xmx) based on your system’s available memory.
Optimize Your Code:
- Review your code for any memory leaks or inefficient memory usage patterns.
- Avoid creating unnecessary objects or holding references longer than needed.
Data Lake Table Optimization:
- Running OPTIMIZE datalake.table can help optimize the table layout and improve query performance. It reorganizes data files and statistics.
- Additionally, consider running VACUUM and ANALYZE commands periodically to maintain data quality and optimize storage.
Partitioning and Clustering:
- If your table has partitions, ensure they are well-defined and aligned with your query patterns.
- Clustering data based on frequently queried columns can enhance performance.
Compression:
- Evaluate using compression for your data files. Compressed files consume less storage and can improve read performance.
File Fragmentation:
- The message “determining dbio file fragments” indicates that the system is analyzing file fragmentation. This process can take time.
- If possible, pre-allocate space for your data files to minimize fragmentation during writes.
Remember that optimizing performance involves a combination of factors, including memory management, query design, and table maintenance. Experiment with the suggestions above and monitor the impact on execution time.
Feel free to run OPTIMIZE datalake.table and observe the results. If you encounter any issues, let us know.
