srkukarni commented on a change in pull request #3698: Adjust the serving 
threads to have a minimum of  threads
URL: https://github.com/apache/pulsar/pull/3698#discussion_r260842663
 
 

 ##########
 File path: 
pulsar-broker-common/src/main/java/org/apache/pulsar/broker/ServiceConfiguration.java
 ##########
 @@ -146,7 +146,7 @@
             doc = "Number of threads to use for HTTP requests processing"
                 + " Default is set to `2 * 
Runtime.getRuntime().availableProcessors()`"
         )
-    private int numHttpServerThreads = 2 * 
Runtime.getRuntime().availableProcessors();
+    private int numHttpServerThreads = Math.max(4, 2 * 
Runtime.getRuntime().availableProcessors());
 
 Review comment:
   What do you think would be the right number?
   One thing is that with the current settings, on a one core machine, pulsar 
standalone wouldnt even come up. This fix solves that. 

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