Yuri Simione created SLING-11251:
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Summary: Apache Sling Post Servlet consumes too much resources
during content ingestion
Key: SLING-11251
URL: https://issues.apache.org/jira/browse/SLING-11251
Project: Sling
Issue Type: Bug
Components: Servlets
Affects Versions: Starter 12
Environment: Mac OS, OpenJDK 1.8, Intel I9, 16gb RAM.
Reporter: Yuri Simione
Attachments: image-2022-04-05-09-09-08-725.png,
image-2022-04-05-09-19-55-925.png
I am testing performances of Apache Sling 12, configured with Oak Segment
Store, started with the -Xmx4g parameter. I'm using a multi-threaded Python
script (I tried with 30 threads down to 5 concurrent threads). The tool loads
thousands of contents on new oak:Unstructured nodes using the standard {*}Sling
Post servlet{*}. Before to start the import I stopper the Lucene bundle.
Initially performances are good (about 200 new documents/sec). Soon, after the
tool has ingested about 20k new nodes, the speed drops to a few nodes per
second. I analyzed the JVM and noticed that the memory allocated for some
threads grows by several GBs without ever going down (see attached images). If
I stop the import tool, the situation does not change. The only way to solve
this problem is to turn off the Sling instance and restart it. Is it normal for
threads to acquire resources that are never released?
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