dasahcc commented on a change in pull request #367: Add transient cache for 
CustomRestClient implementation
URL: https://github.com/apache/helix/pull/367#discussion_r310212588
 
 

 ##########
 File path: 
helix-rest/src/main/java/org/apache/helix/rest/client/CustomRestClientImpl.java
 ##########
 @@ -97,7 +106,43 @@ public CustomRestClientImpl(HttpClient httpClient) {
           kv -> result.put(kv.getKey(), 
kv.getValue().get(IS_HEALTHY_FIELD).asBoolean()));
       return result;
     };
-    return handleResponse(post(url, payLoads), jsonConverter);
+    String requestId = baseUrl + customPayloads.toString() + 
partitions.toString();
+    try {
+      lock(requestId);
+      if (_cachedResults.containsKey(requestId)) {
+        return _cachedResults.get(requestId);
+      }
+      Map<String, Boolean> result = handleResponse(post(url, payLoads), 
jsonConverter);
+      _cachedResults.put(requestId, result);
+      return result;
+    } catch (InterruptedException e) {
+      e.printStackTrace();
 
 Review comment:
   Why not use log but print out?

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