[ratis] branch master updated: RATIS-1876. NPE in GrpcLogAppender.resetClient. (#908)

[williamsong]

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williamsong pushed a commit to branch master
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The following commit(s) were added to refs/heads/master by this push:
     new 670a4ee71 RATIS-1876. NPE in GrpcLogAppender.resetClient. (#908)
670a4ee71 is described below

commit 670a4ee71a48a74154044370c20cda5ff6932f6e
Author: Tsz-Wo Nicholas Sze <szets...@apache.org>
AuthorDate: Sun Aug 27 04:15:18 2023 -0700

    RATIS-1876. NPE in GrpcLogAppender.resetClient. (#908)
---
 .../src/main/java/org/apache/ratis/grpc/server/GrpcLogAppender.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git 
a/ratis-grpc/src/main/java/org/apache/ratis/grpc/server/GrpcLogAppender.java 
b/ratis-grpc/src/main/java/org/apache/ratis/grpc/server/GrpcLogAppender.java
index d3bf28dee..63ef10a02 100644
--- a/ratis-grpc/src/main/java/org/apache/ratis/grpc/server/GrpcLogAppender.java
+++ b/ratis-grpc/src/main/java/org/apache/ratis/grpc/server/GrpcLogAppender.java
@@ -123,8 +123,10 @@ public class GrpcLogAppender extends LogAppenderBase {
   private void resetClient(AppendEntriesRequest request, boolean onError) {
     try (AutoCloseableLock writeLock = lock.writeLock(caller, LOG::trace)) {
       getClient().resetConnectBackoff();
-      appendLogRequestObserver.stop();
-      appendLogRequestObserver = null;
+      if (appendLogRequestObserver != null) {
+        appendLogRequestObserver.stop();
+        appendLogRequestObserver = null;
+      }
       firstResponseReceived = false;
       // clear the pending requests queue and reset the next index of follower
       pendingRequests.clear();