From 4c281cbff4865c807005f14f9e3eebc5869d679f Mon Sep 17 00:00:00 2001
From: mokai <mokai87@126.com>
Date: Fri, 21 Aug 2020 21:19:02 +0800
Subject: [PATCH] HBASE-24686 [LOG] Log improvement in Connection#close (#2219)

Signed-off-by: Pankaj Kumar <pankajkumar@apache.org>
Signed-off-by: Viraj Jasani <vjasani@apache.org>
Signed-off-by: Sean Busbey <busbey@apache.org>
(cherry picked from commit 31fb9fc57f7d97b1c248a94637c778fe67cb2004)

Change-Id: I04f188d582df7c32ad62115beecbb140d3f5b395
---
 .../hadoop/hbase/client/AsyncConnectionImpl.java   | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java
index e0b7407394f0..b4b8c65a9bfa 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java
@@ -189,6 +189,10 @@ public void close() {
     if (closed) {
       return;
     }
+    LOG.info("Connection has been closed by {}.", Thread.currentThread().getName());
+    if(LOG.isDebugEnabled()){
+      logCallStack(Thread.currentThread().getStackTrace());
+    }
     IOUtils.closeQuietly(clusterStatusListener);
     IOUtils.closeQuietly(rpcClient);
     IOUtils.closeQuietly(registry);
@@ -199,6 +203,16 @@ public void close() {
     closed = true;
   }
 
+  private void logCallStack(StackTraceElement[] stackTraceElements) {
+    StringBuilder stackBuilder = new StringBuilder("Call stack:");
+    for (StackTraceElement element : stackTraceElements) {
+      stackBuilder.append("\n    at ");
+      stackBuilder.append(element);
+    }
+    stackBuilder.append("\n");
+    LOG.debug(stackBuilder.toString());
+  }
+
   @Override
   public boolean isClosed() {
     return closed;