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Cross reference backpressure info (#14508) 

Co-authored-by: Jill Osborne <jill.osborne@imply.io>
Co-authored-by: Cristian Popa <cristian.popa@imply.io>
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cristian-popa 2023-07-12 12:02:04 -05:00 committed by GitHub
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docs/configuration/index.md
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@ -1887,7 +1887,7 @@ client has the following configuration options.
|`druid.broker.http.compressionCodec`|Compression codec the Broker uses to communicate with Historical and real-time processes. May be "gzip" or "identity".|`gzip`| |`druid.broker.http.compressionCodec`|Compression codec the Broker uses to communicate with Historical and real-time processes. May be "gzip" or "identity".|`gzip`|
|`druid.broker.http.readTimeout`|The timeout for data reads from Historical servers and real-time tasks.|`PT15M`| |`druid.broker.http.readTimeout`|The timeout for data reads from Historical servers and real-time tasks.|`PT15M`|
|`druid.broker.http.unusedConnectionTimeout`|The timeout for idle connections in connection pool. The connection in the pool will be closed after this timeout and a new one will be established. This timeout should be less than `druid.broker.http.readTimeout`. Set this timeout = ~90% of `druid.broker.http.readTimeout`|`PT4M`| |`druid.broker.http.unusedConnectionTimeout`|The timeout for idle connections in connection pool. The connection in the pool will be closed after this timeout and a new one will be established. This timeout should be less than `druid.broker.http.readTimeout`. Set this timeout = ~90% of `druid.broker.http.readTimeout`|`PT4M`|
|`druid.broker.http.maxQueuedBytes`|Maximum number of bytes queued per query before exerting backpressure on channels to the data servers.<br /><br />Similar to `druid.server.http.maxScatterGatherBytes`, except unlike that configuration, this one will trigger backpressure rather than query failure. Zero means disabled. Can be overridden by the ["maxQueuedBytes" query context parameter](../querying/query-context.md). Human-readable format is supported, see [here](human-readable-byte.md). |`25MB` or 2% of maximum Broker heap size, whichever is greater| |`druid.broker.http.maxQueuedBytes`|Maximum number of bytes queued per query before exerting [backpressure](../operations/basic-cluster-tuning.md#broker-backpressure) on channels to the data servers.<br /><br />Similar to `druid.server.http.maxScatterGatherBytes`, except that `maxQueuedBytes` triggers [backpressure](../operations/basic-cluster-tuning.md#broker-backpressure) instead of query failure. Set to zero to disable. You can override this setting by using the [`maxQueuedBytes` query context parameter](../querying/query-context.md). Druid supports [human-readable](human-readable-byte.md) format. |`25MB` or 2% of maximum Broker heap size, whichever is greater.|
|`druid.broker.http.numMaxThreads`|`Maximum number of I/O worker threads|max(10, ((number of cores * 17) / 16 + 2) + 30)`| |`druid.broker.http.numMaxThreads`|`Maximum number of I/O worker threads|max(10, ((number of cores * 17) / 16 + 2) + 30)`|
##### Retry Policy ##### Retry Policy