diff --git a/powerjob-server/powerjob-server-core/src/main/java/tech/powerjob/server/core/instance/InstanceLogService.java b/powerjob-server/powerjob-server-core/src/main/java/tech/powerjob/server/core/instance/InstanceLogService.java
index a12f05d0..42c67d0c 100644
--- a/powerjob-server/powerjob-server-core/src/main/java/tech/powerjob/server/core/instance/InstanceLogService.java
+++ b/powerjob-server/powerjob-server-core/src/main/java/tech/powerjob/server/core/instance/InstanceLogService.java
@@ -1,23 +1,5 @@
 package tech.powerjob.server.core.instance;
 
-import org.springframework.core.task.AsyncTaskExecutor;
-import org.springframework.core.task.TaskExecutor;
-import tech.powerjob.common.enums.LogLevel;
-import tech.powerjob.common.OmsConstant;
-import tech.powerjob.common.enums.TimeExpressionType;
-import tech.powerjob.common.model.InstanceLogContent;
-import tech.powerjob.common.utils.CommonUtils;
-import tech.powerjob.common.utils.NetUtils;
-import tech.powerjob.common.utils.SegmentLock;
-import tech.powerjob.server.common.constants.PJThreadPool;
-import tech.powerjob.server.extension.dfs.*;
-import tech.powerjob.server.persistence.storage.Constants;
-import tech.powerjob.server.remote.server.redirector.DesignateServer;
-import tech.powerjob.server.common.utils.OmsFileUtils;
-import tech.powerjob.server.persistence.StringPage;
-import tech.powerjob.server.persistence.remote.model.JobInfoDO;
-import tech.powerjob.server.persistence.local.LocalInstanceLogDO;
-import tech.powerjob.server.persistence.local.LocalInstanceLogRepository;
 import com.google.common.base.Stopwatch;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
@@ -27,18 +9,37 @@ import org.apache.commons.lang3.exception.ExceptionUtils;
 import org.apache.commons.lang3.time.FastDateFormat;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.core.task.AsyncTaskExecutor;
 import org.springframework.scheduling.annotation.Async;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.support.TransactionTemplate;
 import org.springframework.util.CollectionUtils;
+import tech.powerjob.common.OmsConstant;
+import tech.powerjob.common.enums.LogLevel;
+import tech.powerjob.common.enums.TimeExpressionType;
+import tech.powerjob.common.model.InstanceLogContent;
+import tech.powerjob.common.utils.CommonUtils;
+import tech.powerjob.common.utils.NetUtils;
+import tech.powerjob.common.utils.SegmentLock;
+import tech.powerjob.server.common.constants.PJThreadPool;
+import tech.powerjob.server.common.utils.OmsFileUtils;
+import tech.powerjob.server.extension.dfs.*;
+import tech.powerjob.server.persistence.StringPage;
+import tech.powerjob.server.persistence.local.LocalInstanceLogDO;
+import tech.powerjob.server.persistence.local.LocalInstanceLogRepository;
+import tech.powerjob.server.persistence.remote.model.JobInfoDO;
+import tech.powerjob.server.persistence.storage.Constants;
+import tech.powerjob.server.remote.server.redirector.DesignateServer;
 
 import javax.annotation.Resource;
 import java.io.*;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
-import java.util.concurrent.*;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -91,9 +92,9 @@ public class InstanceLogService {
      */
     private static final int MAX_LINE_COUNT = 100;
     /**
-     * 过期时间
+     * 更新中的日志缓存时间
      */
-    private static final long EXPIRE_INTERVAL_MS = 60000;
+    private static final long LOG_CACHE_TIME = 10000;
 
     /**
      * 提交日志记录，持久化到本地数据库中
@@ -248,7 +249,7 @@ public class InstanceLogService {
             return localTransactionTemplate.execute(status -> {
                 File f = new File(path);
                 // 如果文件存在且有效，则不再重新构建日志文件（这个判断也需要放在锁内，否则构建到一半的文件会被返回）
-                if (f.exists() && (System.currentTimeMillis() - f.lastModified()) < EXPIRE_INTERVAL_MS) {
+                if (f.exists() && (System.currentTimeMillis() - f.lastModified()) < LOG_CACHE_TIME) {
                     return f;
                 }
                 try {
diff --git a/powerjob-worker-samples/src/main/java/tech/powerjob/samples/processors/MapReduceProcessorDemo.java b/powerjob-worker-samples/src/main/java/tech/powerjob/samples/processors/MapReduceProcessorDemo.java
index 215a95a0..2b77c370 100644
--- a/powerjob-worker-samples/src/main/java/tech/powerjob/samples/processors/MapReduceProcessorDemo.java
+++ b/powerjob-worker-samples/src/main/java/tech/powerjob/samples/processors/MapReduceProcessorDemo.java
@@ -17,6 +17,7 @@ import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Component;
 
 import java.util.List;
+import java.util.Optional;
 import java.util.concurrent.ThreadLocalRandom;
 
 /**
@@ -40,7 +41,7 @@ public class MapReduceProcessorDemo implements MapReduceProcessor {
         log.info("taskContext:{}", JsonUtils.toJSONString(context));
 
         // 根据控制台参数获取MR批次及子任务大小
-        final JSONObject jobParams = JSONObject.parseObject(context.getJobParams());
+        final JSONObject jobParams = Optional.ofNullable(context.getJobParams()).map(JSONObject::parseObject).orElse(new JSONObject());
 
         Integer batchSize = (Integer) jobParams.getOrDefault("batchSize", 100);
         Integer batchNum = (Integer) jobParams.getOrDefault("batchNum", 10);