[GitHub] [incubator-druid] jihoonson commented on a change in pull request #8038: Making optimal usage of multiple segment cache locations

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jihoonson commented on a change in pull request #8038: Making optimal usage of multiple segment cache locations
URL: https://github.com/apache/incubator-druid/pull/8038#discussion_r312294023
 
 

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 File path: docs/content/configuration/index.md
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 @@ -1263,6 +1263,7 @@ These Historical configurations can be defined in the `historical/runtime.proper
 |Property|Description|Default|
 |--------|-----------|-------|
 |`druid.segmentCache.locations`|Segments assigned to a Historical process are first stored on the local file system (in a disk cache) and then served by the Historical process. These locations define where that local cache resides. This value cannot be NULL or EMPTY. Here is an example `druid.segmentCache.locations=[{"path": "/mnt/druidSegments", "maxSize": 10000, "freeSpacePercent": 1.0}]`. "freeSpacePercent" is optional, if provided then enforces that much of free disk partition space while storing segments. But, it depends on File.getTotalSpace() and File.getFreeSpace() methods, so enable if only if they work for your File System.| none |
+|`druid.segmentCache.locationSelectorStrategy`|The strategy used to select a location from the configured `druid.segmentCache.locations` for optimal segment distribution. Possible values are `leastBytesUsed` or `roundRobin`. The leastBytesUsed strategy always selects a location which has least bytes used in absolute terms.The roundRobin strategy selects a location in a round robin fashion oblivious to the bytes used or the capacity. |leastBytesUsed|
 
 Review comment:
   Maybe better to add a section below to explain location selection strategies rather than explaining them here.

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