saintstack commented on a change in pull request #287: HBASE-21512 Reimplement 
sync client based on async client
URL: https://github.com/apache/hbase/pull/287#discussion_r291392619
 
 

 ##########
 File path: 
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionUtils.java
 ##########
 @@ -695,4 +606,94 @@ static void updateStats(Optional<ServerStatisticTracker> 
optStats,
         metrics -> ResultStatsUtil.updateStats(metrics, serverName, 
regionName, regionLoadStats));
     });
   }
+
+  @FunctionalInterface
+  interface Converter<D, I, S> {
+    D convert(I info, S src) throws IOException;
+  }
+
+  @FunctionalInterface
+  interface RpcCall<RESP, REQ> {
+    void call(ClientService.Interface stub, HBaseRpcController controller, REQ 
req,
+        RpcCallback<RESP> done);
+  }
+
+  static <REQ, PREQ, PRESP, RESP> CompletableFuture<RESP> 
call(HBaseRpcController controller,
+      HRegionLocation loc, ClientService.Interface stub, REQ req,
+      Converter<PREQ, byte[], REQ> reqConvert, RpcCall<PRESP, PREQ> rpcCall,
+      Converter<RESP, HBaseRpcController, PRESP> respConverter) {
+    CompletableFuture<RESP> future = new CompletableFuture<>();
+    try {
+      rpcCall.call(stub, controller, 
reqConvert.convert(loc.getRegion().getRegionName(), req),
+        new RpcCallback<PRESP>() {
+
+          @Override
+          public void run(PRESP resp) {
+            if (controller.failed()) {
+              future.completeExceptionally(controller.getFailed());
+            } else {
+              try {
+                future.complete(respConverter.convert(controller, resp));
+              } catch (IOException e) {
+                future.completeExceptionally(e);
+              }
+            }
+          }
+        });
+    } catch (IOException e) {
+      future.completeExceptionally(e);
+    }
+    return future;
+  }
+
+  static ThreadPoolExecutor getThreadPool(Configuration conf, int maxThreads, 
int coreThreads,
 
 Review comment:
   This pool is shared by what in the client?

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