Overview
- These tests are run to investigate the performance difference of mod-data-export with logLevel=info vs logLevel=warn for Juniper release. This testing was part of MDEXP-394 - Getting issue details... STATUS where we observed that mod-data-export is continuously writing a lot of data to log. For 100K DE job, mod-data-export is writing 42Million records. This could also result in a crash if there is not enough CPU, memory allocated to mod-data-export.
- In mod-data-export log4j2.properties file was modified with rootLogger.level = warn, logger.netty.level = warn, status = warn
Backend:
- mod-data-export-4.1.1 (snapshot version)
- mod-source-record-storage-5.1.4
- mod-source-record-manager-3.1.3
- okapi-4.8.2
- mod-authtoken-2.8.0
Frontend:
- folio_data-export-4.1.0
Environment:
- 8 million inventory records
- 74 FOLIO back-end modules deployed in 144 ECS services
- 3 okapi ECS services
- 12 m5.large EC2 instances
- 1 writer db.r6g.xlarge 1 reader db.r6g.xlarge AWS RDS instance
- INFO logging level / WARN logging level
- mod-data-export Soft memory limit - 360 MB Hard memory limit - 512 MB
- CPU - 128
High-Level Summary
- With WARN level logging, 9% improvement in memory utilization
- With WARN level logging, 70% improvement in CPU utilization
- With WARN level logging, No bumps in the memory were observed. Memory utilization stays stable for multiple Data Export job runs.
- Improvement by 42Million records for WARN. 42 Million fewer records were written
- With WARN level logging, there is improvement in JVM's Garbage collection
Test Runs
1 user - INFO level logging vs WARN level logging
Test | Total instances | mod-data-export log level | Duration (Total time to complete exporting all instances, holdings, and items) | Total records logged in CloudWatch | DE Job profile |
| 1. | 100,000 | INFO | 1 hour 6 minutes | 42.5 Million | Holdings and item |
| 2. | 100,000 | WARN | 57 minutes | 120K | Holdings and item |
Total records logged for 100K, INFO vs WARN
INFO - ~42.5 Million records
WARN - ~120K records
Service Memory Utilization
For mod-data-export, 9% improvement in memory for WARN level logging
Memory Utilization INFO vs WARN
CPU Utilization
For mod-data-export, 70% improvement in CPU utilization for WARN level logging
INFO level logging
WARN level logging
Heap dump analysis using JXRay
4.6% improvement in Garbage collection with WARN level logging. That means, mod-data-export is generating less Unreachable garbage objects. WARN level logging is effectively utilization 12 MB of JVM memory. While with INFO level logging, this 12 MB is wasted. This is only for 100K run. As we run the Data Export job continuously, this 12MB could be much larger.
INFO level:
WARN level:
Other than this, with WARN level logging, mod-data-export will create fewer Object instances in JVM. For detailed comparison see mod-data-export-with-info-logging.html vs mod-data-export-with-warn-logging.html