[ratis] branch master updated: RATIS-1917. Print Epoll.unavailabilityCause() only once. (#949)

[guohao1225]

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The following commit(s) were added to refs/heads/master by this push:
     new 94a8fbe41 RATIS-1917. Print Epoll.unavailabilityCause() only once. 
(#949)
94a8fbe41 is described below

commit 94a8fbe419157b449a1fa534fe1fd2b970d09587
Author: Tsz-Wo Nicholas Sze <szets...@apache.org>
AuthorDate: Mon Oct 23 18:51:09 2023 -0700

    RATIS-1917. Print Epoll.unavailabilityCause() only once. (#949)
    
    * RATIS-1917. Print Epoll.unavailabilityCause() only once.
---
 .../java/org/apache/ratis/netty/NettyUtils.java    | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/ratis-netty/src/main/java/org/apache/ratis/netty/NettyUtils.java 
b/ratis-netty/src/main/java/org/apache/ratis/netty/NettyUtils.java
index 2b643d7c9..8cce291af 100644
--- a/ratis-netty/src/main/java/org/apache/ratis/netty/NettyUtils.java
+++ b/ratis-netty/src/main/java/org/apache/ratis/netty/NettyUtils.java
@@ -40,19 +40,37 @@ import org.slf4j.LoggerFactory;
 
 import javax.net.ssl.KeyManager;
 import javax.net.ssl.TrustManager;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.function.Function;
 
 public interface NettyUtils {
   Logger LOG = LoggerFactory.getLogger(NettyUtils.class);
 
+  class Print {
+    private static final AtomicBoolean PRINTED_EPOLL_UNAVAILABILITY_CAUSE = 
new AtomicBoolean();
+
+    private Print() {}
+
+    static void epollUnavailability(String message) {
+      if (!LOG.isWarnEnabled()) {
+        return;
+      }
+      if (PRINTED_EPOLL_UNAVAILABILITY_CAUSE.compareAndSet(false, true)) {
+        LOG.warn(message, new IllegalStateException("Epoll is unavailable.", 
Epoll.unavailabilityCause()));
+      } else {
+        LOG.warn(message);
+      }
+    }
+  }
+
   static EventLoopGroup newEventLoopGroup(String name, int size, boolean 
useEpoll) {
     if (useEpoll) {
       if (Epoll.isAvailable()) {
         LOG.info("Create EpollEventLoopGroup for {}; Thread size is {}.", 
name, size);
         return new EpollEventLoopGroup(size, 
ConcurrentUtils.newThreadFactory(name + "-"));
       } else {
-        LOG.warn("Failed to create EpollEventLoopGroup for " + name + "; fall 
back on NioEventLoopGroup.",
-            Epoll.unavailabilityCause());
+        Print.epollUnavailability("Failed to create EpollEventLoopGroup for " 
+ name
+            + "; fall back on NioEventLoopGroup.");
       }
     }
     return new NioEventLoopGroup(size, ConcurrentUtils.newThreadFactory(name + 
"-"));