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[Backport 3.1] Add min and max threads parameters to tiered cache #10316

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Jul 16, 2025
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[Backport 3.1] Add min and max threads parameters to tiered cache #10316

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2 changes: 2 additions & 0 deletions _search-plugins/caching/tiered-cache.md
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Expand Up @@ -67,6 +67,8 @@
`indices.requests.cache.ehcache_disk.alias` | String | `ehcacheDiskCache#INDICES_REQUEST_CACHE` | Specifies an alias for the disk cache. Optional.
`indices.requests.cache.ehcache_disk.segments` | Integer | `16` | Defines the number of segments into which the disk cache is separated. Used for concurrency. Optional.
`indices.requests.cache.ehcache_disk.concurrency` | Integer | `1` | Defines the number of distinct write queues created for the disk store, where a group of segments shares a write queue. Optional.
`indices.requests.cache.ehcache_disk.min_threads` | Integer | `2` | Defines the minimum number of ehcache disk threads for the pool. Optional.

Check failure on line 70 in _search-plugins/caching/tiered-cache.md

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GitHub Actions / vale

[vale] _search-plugins/caching/tiered-cache.md#L70 

[OpenSearch.Spelling] Error: ehcache. If you are referencing a setting, variable, format, function, or repository, surround it with tic marks.
Raw output 
{"message": "[OpenSearch.Spelling] Error: ehcache. If you are referencing a setting, variable, format, function, or repository, surround it with tic marks.", "location": {"path": "_search-plugins/caching/tiered-cache.md", "range": {"start": {"line": 70, "column": 100}}}, "severity": "ERROR"}
`indices.requests.cache.ehcache_disk.max_threads` | Integer | The number of CPU cores | Defines the maximum number of ehcache disk threads for the pool. The maximum allowed value is `10 * num_cpu_cores`. Disk operations are typically I/O bound rather than CPU bound, so you can set this value to a number greater than the number of CPU cores. Optional.

Check failure on line 71 in _search-plugins/caching/tiered-cache.md

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GitHub Actions / vale

[vale] _search-plugins/caching/tiered-cache.md#L71 

[OpenSearch.Spelling] Error: ehcache. If you are referencing a setting, variable, format, function, or repository, surround it with tic marks.
Raw output 
{"message": "[OpenSearch.Spelling] Error: ehcache. If you are referencing a setting, variable, format, function, or repository, surround it with tic marks.", "location": {"path": "_search-plugins/caching/tiered-cache.md", "range": {"start": {"line": 71, "column": 25}}}, "severity": "ERROR"}

### Additional settings for the `tiered_spillover` store

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