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
 
 

 ##########
 File path: docs/configuration/index.md
 ##########
 @@ -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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