[GitHub] [pinot] richardstartin commented on a diff in pull request #8491: Add connection based FailureDetector

[GitBox]

richardstartin commented on code in PR #8491:
URL: https://github.com/apache/pinot/pull/8491#discussion_r847759869


##########
pinot-core/src/main/java/org/apache/pinot/core/transport/ServerChannels.java:
##########
@@ -181,24 +191,43 @@ private void sendRequest(String rawTableName, 
AsyncQueryResponse asyncQueryRespo
       }
     }
 
-    private void sendRequest(String rawTableName, AsyncQueryResponse 
asyncQueryResponse,
-        ServerRoutingInstance serverRoutingInstance, byte[] requestBytes)
-        throws Exception {
+    void connectWithoutLocking()
+        throws InterruptedException {
       if (_channel == null || !_channel.isActive()) {
         long startTime = System.currentTimeMillis();
         _channel = _bootstrap.connect().sync().channel();
         
_brokerMetrics.setValueOfGlobalGauge(BrokerGauge.NETTY_CONNECTION_CONNECT_TIME_MS,
             System.currentTimeMillis() - startTime);
       }
-      long sendRequestStartTimeMs = System.currentTimeMillis();
+    }
+
+    void sendRequestWithoutLocking(String rawTableName, AsyncQueryResponse 
asyncQueryResponse,
+        ServerRoutingInstance serverRoutingInstance, byte[] requestBytes) {
+      long startTimeMs = System.currentTimeMillis();
       
_channel.writeAndFlush(Unpooled.wrappedBuffer(requestBytes)).addListener(f -> {
-        long requestSentLatencyMs = System.currentTimeMillis() - 
sendRequestStartTimeMs;
+        long requestSentLatencyMs = System.currentTimeMillis() - startTimeMs;
         _brokerMetrics.addTimedTableValue(rawTableName, 
BrokerTimer.NETTY_CONNECTION_SEND_REQUEST_LATENCY,
             requestSentLatencyMs, TimeUnit.MILLISECONDS);
         asyncQueryResponse.markRequestSent(serverRoutingInstance, 
requestSentLatencyMs);
       });
       
_brokerMetrics.addMeteredGlobalValue(BrokerMeter.NETTY_CONNECTION_REQUESTS_SENT,
 1);
       
_brokerMetrics.addMeteredGlobalValue(BrokerMeter.NETTY_CONNECTION_BYTES_SENT, 
requestBytes.length);
     }
+
+    boolean connect() {
+      try {
+        if (_channelLock.tryLock(TRY_CONNECT_CHANNEL_LOCK_TIMEOUT_MS, 
TimeUnit.MILLISECONDS)) {
+          try {
+            connectWithoutLocking();
+            return true;
+          } finally {
+            _channelLock.unlock();
+          }
+        }
+      } catch (Exception e) {
+        // Ignored

Review Comment:
   Should probably not swallow this, at least log if at debug



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