title: configuration maxSemaphores for zuul server
body: <p>I am trying to do load test for zuul <code>version 1.1.2</code>.</p>
  
  <p>However I am keep getting following issue after few a minute for running load test.</p>
  
  <pre><code>Caused by: com.netflix.hystrix.exception.HystrixRuntimeException: book could not acquire a semaphore for execution and no fallback available.
      at com.netflix.hystrix.AbstractCommand$21.call(AbstractCommand.java:783) ~[hystrix-core-1.5.3.jar:1.5.3]
  </code></pre>
  
  <p>My question is how can I increase <code>maxSemaphores</code> via confiugration.</p>
  
  <pre><code>hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds= 20000000
  zuul.hystrix.command.default.execution.isolation.strategy= SEMAPHORE
  zuul.hystrix.command.default.execution.isolation.semaphore.maxConcurrentRequests= 10
  zuul.hystrix.command.default.fallback.isolation.semaphore.maxConcurrentRequests= 10
  zuul.semaphore.maxSemaphores=3000
  </code></pre>
  
  <p><strong>zuul.eureka.book.semaphore.maxSemaphore=30000</strong></p>
  
  <p>I have tried search many option on Intenet but one of those works for me</p>
  
  <p>Please advise</p>