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[Backport 3.3] Setting number of sharedArenaMaxPermits to 1 #19505

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Oct 2, 2025
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[Backport 3.3] Setting number of sharedArenaMaxPermits to 1 #19505

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -101,6 +101,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
- Implement SslHandler retrieval logic for transport-reactor-netty4 plugin ([#19458](https://github.com/opensearch-project/OpenSearch/pull/19458))
- Cache serialised cluster state based on cluster state version and node version.([#19307](https://github.com/opensearch-project/OpenSearch/pull/19307))
- Fix stats API in store-subdirectory module's SubdirectoryAwareStore ([#19470](https://github.com/opensearch-project/OpenSearch/pull/19470))
- Setting number of sharedArenaMaxPermits to 1 ([#19503](https://github.com/opensearch-project/OpenSearch/pull/19503))
- Handle negative search request nodes stats ([#19340](https://github.com/opensearch-project/OpenSearch/pull/19340))
- Remove unnecessary iteration per-shard in request cache cleanup ([#19263](https://github.com/opensearch-project/OpenSearch/pull/19263))

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5 changes: 5 additions & 0 deletions distribution/src/config/jvm.options
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Expand Up @@ -86,3 +86,8 @@ ${error.file}

21-:-javaagent:agent/opensearch-agent.jar
21-:--add-opens=java.base/java.nio=org.apache.arrow.memory.core,ALL-UNNAMED

# For cases with high memory-mapped file counts, a lower value can improve stability and
# prevent issues like "leaked" maps or performance degradation. A value of 1 effectively
# disables the shared Arena pooling and uses a confined Arena for each MMapDirectory
-Dorg.apache.lucene.store.MMapDirectory.sharedArenaMaxPermits=1
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