[GitHub] [druid] sascha-coenen commented on a change in pull request #9407: query laning and load shedding

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sascha-coenen commented on a change in pull request #9407: query laning and load shedding
URL: https://github.com/apache/druid/pull/9407#discussion_r385204827
 
 

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 File path: docs/configuration/index.md
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 @@ -1476,9 +1476,31 @@ These Broker configurations can be defined in the `broker/runtime.properties` fi
 |`druid.broker.select.tier`|`highestPriority`, `lowestPriority`, `custom`|If segments are cross-replicated across tiers in a cluster, you can tell the broker to prefer to select segments in a tier with a certain priority.|`highestPriority`|
 |`druid.broker.select.tier.custom.priorities`|`An array of integer priorities.`|Select servers in tiers with a custom priority list.|None|
 
+##### Query laning
+
+Druid provides facilities to aid in query capacity reservation for heterogenous query workloads in the form of 'laning' strategies, which provide a variety of mechanisms examine and classify a query at the broker, assigning it to a 'lane'. Lanes are defined with capacity limits which the broker will enforce, causing requests in excess of the capacity to be discarded with an HTTP 429 status code, reserving resources for other lanes or for interactive queries (with no lane). 
 
 Review comment:
   > a variety of mechanisms examine 
   I believe a "to" is missing here ?

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