From 2025243fbf94fb9a0324de7b159a275bc58c84d0 Mon Sep 17 00:00:00 2001
From: jianghuazhu <740087514@qq.com>
Date: Thu, 17 Feb 2022 04:19:45 +0800
Subject: [PATCH] HADOOP-18082.Add debug log when RPC#Reader gets a Call.
 (#3891). Contributed by JiangHua Zhu.

---
 .../src/main/java/org/apache/hadoop/ipc/Server.java            | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
index c5732c68b1..c36e1f655f 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
@@ -3029,6 +3029,9 @@ private void internalQueueCall(Call call, boolean blocking)
       } else {
         callQueue.add(call);
       }
+
+      LOG.debug("Call has entered the CallQueue and is waiting to be processed. " +
+          "Call details: {}", call);
       long deltaNanos = Time.monotonicNowNanos() - call.timestampNanos;
       call.getProcessingDetails().set(Timing.ENQUEUE, deltaNanos,
           TimeUnit.NANOSECONDS);