esteban commented on a change in pull request #1858:
URL: https://github.com/apache/hbase/pull/1858#discussion_r436155356



##########
File path: 
hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcConnection.java
##########
@@ -253,52 +268,38 @@ public void operationComplete(Future<Boolean> future) 
throws Exception {
   }
 
   private void connect() {
+    assert eventLoop.inEventLoop();
     LOG.trace("Connecting to {}", remoteId.address);
 
-    this.channel = new 
Bootstrap().group(rpcClient.group).channel(rpcClient.channelClass)
-        .option(ChannelOption.TCP_NODELAY, rpcClient.isTcpNoDelay())
-        .option(ChannelOption.SO_KEEPALIVE, rpcClient.tcpKeepAlive)
-        .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, rpcClient.connectTO)
-        .handler(new 
BufferCallBeforeInitHandler()).localAddress(rpcClient.localAddr)
-        .remoteAddress(remoteId.address).connect().addListener(new 
ChannelFutureListener() {
-
-          @Override
-          public void operationComplete(ChannelFuture future) throws Exception 
{
-            Channel ch = future.channel();
-            if (!future.isSuccess()) {
-              failInit(ch, toIOE(future.cause()));
-              rpcClient.failedServers.addToFailedServers(remoteId.address, 
future.cause());
-              return;
-            }
-            ch.writeAndFlush(connectionHeaderPreamble.retainedDuplicate());
-            if (useSasl) {
-              saslNegotiate(ch);
-            } else {
-              // send the connection header to server
-              ch.write(connectionHeaderWithLength.retainedDuplicate());
-              established(ch);
-            }
-          }
-        }).channel();
-  }
+    this.channel = new 
Bootstrap().group(eventLoop).channel(rpcClient.channelClass)
+      .option(ChannelOption.TCP_NODELAY, rpcClient.isTcpNoDelay())
+      .option(ChannelOption.SO_KEEPALIVE, rpcClient.tcpKeepAlive)
+      .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, rpcClient.connectTO)
+      .handler(new 
BufferCallBeforeInitHandler()).localAddress(rpcClient.localAddr)
+      .remoteAddress(remoteId.address).connect().addListener(new 
ChannelFutureListener() {
 
-  private void write(Channel ch, final Call call) {
-    ch.writeAndFlush(call).addListener(new ChannelFutureListener() {
-
-      @Override
-      public void operationComplete(ChannelFuture future) throws Exception {
-        // Fail the call if we failed to write it out. This usually because 
the channel is
-        // closed. This is needed because we may shutdown the channel inside 
event loop and
-        // there may still be some pending calls in the event loop queue after 
us.
-        if (!future.isSuccess()) {
-          call.setException(toIOE(future.cause()));
+        @Override
+        public void operationComplete(ChannelFuture future) throws Exception {
+          Channel ch = future.channel();
+          if (!future.isSuccess()) {
+            failInit(ch, toIOE(future.cause()));
+            rpcClient.failedServers.addToFailedServers(remoteId.address, 
future.cause());
+            return;
+          }
+          ch.writeAndFlush(connectionHeaderPreamble.retainedDuplicate());
+          if (useSasl) {
+            saslNegotiate(ch);
+          } else {
+            // send the connection header to server
+            ch.write(connectionHeaderWithLength.retainedDuplicate());
+            established(ch);
+          }
         }
-      }
-    });
+      }).channel();
   }
 
-  @Override
-  public synchronized void sendRequest(final Call call, HBaseRpcController 
hrc) throws IOException {
+  private void sendRequest0(Call call, HBaseRpcController hrc) throws 
IOException {
+    assert eventLoop.inEventLoop();

Review comment:
       +1 I don't think the assert should be sitting in a hot path.




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