diff --git a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/common/config/ThreadPoolConfig.java b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/common/config/ThreadPoolConfig.java
index 767d0484..fa503d5e 100644
--- a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/common/config/ThreadPoolConfig.java
+++ b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/common/config/ThreadPoolConfig.java
@@ -59,7 +59,7 @@ public class ThreadPoolConfig {
     public Executor initBackgroundPool() {
         ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
         executor.setCorePoolSize(Runtime.getRuntime().availableProcessors());
-        executor.setMaxPoolSize(Runtime.getRuntime().availableProcessors());
+        executor.setMaxPoolSize(Runtime.getRuntime().availableProcessors() * 2);
         executor.setQueueCapacity(8192);
         executor.setKeepAliveSeconds(60);
         executor.setThreadNamePrefix("omsBackgroundPool-");
diff --git a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/InstanceLogService.java b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/InstanceLogService.java
index ae22fe0c..c05fe17d 100644
--- a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/InstanceLogService.java
+++ b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/InstanceLogService.java
@@ -193,6 +193,7 @@ public class InstanceLogService {
         try {
             instanceId2LastReportTime.remove(instanceId);
             CommonUtils.executeWithRetry0(() -> localInstanceLogRepository.deleteByInstanceId(instanceId));
+            log.warn("[InstanceLog-{}] delete local instanceLog successfully.", instanceId);
         }catch (Exception e) {
             log.warn("[InstanceLog-{}] delete local instanceLog failed.", instanceId, e);
         }