FrankChen021 commented on a change in pull request #11878:
URL: https://github.com/apache/druid/pull/11878#discussion_r743751178



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File path: 
server/src/main/java/org/apache/druid/segment/loading/SegmentLoaderConfig.java
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@@ -56,6 +56,9 @@
   @JsonProperty("numBootstrapThreads")
   private Integer numBootstrapThreads = null;
 
+  @JsonProperty("numCacheLoadThreads")
+  private int numCacheLoadThreads = 5;

Review comment:
       What is the purpose to make it a configuration item ? I think if we can 
make it default to the number of CPU cores? Or can we re-use 
`numBootstrapThreads` because it is defined as:
   > How many segments to load concurrently during historical startup.




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