fix causing cpu 100% when set ScheduledThreadPoolExecutor corePoolSize=0

CHANGELOG.md

@@ -2,4 +2,5 @@
 ---
 
 - [Bugfix: fix router bug and add router example](https://github.com/Tencent/spring-cloud-tencent/pull/89)
+- [Bugfix: fix causing cpu 100% when set ScheduledThreadPoolExecutor corePoolSize=0](https://github.com/Tencent/spring-cloud-tencent/pull/98)
 

spring-cloud-starter-tencent-polaris-discovery/src/main/java/com/tencent/cloud/polaris/registry/PolarisServiceRegistry.java

@@ -18,8 +18,8 @@
 
 package com.tencent.cloud.polaris.registry;
 
+import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
 import com.tencent.cloud.common.metadata.config.MetadataLocalProperties;
@@ -71,13 +71,11 @@ public class PolarisServiceRegistry implements ServiceRegistry<Registration> {
 		this.polarisDiscoveryProperties = polarisDiscoveryProperties;
 		this.polarisDiscoveryHandler = polarisDiscoveryHandler;
 		this.metadataLocalProperties = metadataLocalProperties;
+
 		if (polarisDiscoveryProperties.isHeartbeatEnabled()) {
-			ScheduledThreadPoolExecutor heartbeatExecutor = new ScheduledThreadPoolExecutor(
+			this.heartbeatExecutor = Executors
-					0, new NamedThreadFactory("spring-cloud-heartbeat"));
+					.newSingleThreadScheduledExecutor(new NamedThreadFactory("spring-cloud-heartbeat"));
-			heartbeatExecutor.setMaximumPoolSize(1);
+		} else {
-			this.heartbeatExecutor = heartbeatExecutor;
-		}
-		else {
 			this.heartbeatExecutor = null;
 		}
 	}