diff --git a/fine-log4j/src/main/java/com/fr/third/apache/log4j/DailyRollingFileAppender.java b/fine-log4j/src/main/java/com/fr/third/apache/log4j/DailyRollingFileAppender.java
index ab7708297..a2ec34039 100644
--- a/fine-log4j/src/main/java/com/fr/third/apache/log4j/DailyRollingFileAppender.java
+++ b/fine-log4j/src/main/java/com/fr/third/apache/log4j/DailyRollingFileAppender.java
@@ -317,66 +317,70 @@ public class DailyRollingFileAppender extends FileAppender {
     // It is too early to roll over because we are still within the
     // bounds of the current interval. Rollover will occur once the
     // next interval is reached.
-    if (scheduledFilename.equals(datedFilename)) {
-      return;
-    }
+      if (scheduledFilename.equals(datedFilename)) {
+          return;
+      }
+      synchronized (this) {
+          if (scheduledFilename.equals(datedFilename)) {
+              return;
+          }
 
-    // close current file, and compress it to datedFilename
-    this.closeFile();
+          // close current file, and compress it to datedFilename
+          this.closeFile();
 
-    File target  = new File(scheduledFilename);
-    if (target.exists()) {
-      target.delete();
-    }
+          File target = new File(scheduledFilename);
+          if (target.exists()) {
+              target.delete();
+          }
 
-    File file = new File(fileName);
-    boolean result = false;
-
-    FileInputStream fis = null;
-    FileOutputStream fos = null;
-    GZIPOutputStream gzos = null;
-    try {
-        fis = new FileInputStream(file);
-        fos = new FileOutputStream(target);
-        gzos = new GZIPOutputStream(fos);
-        byte[] inbuf = new byte[8102];
-        int n;
-
-        while ((n = fis.read(inbuf)) != -1) {
-            gzos.write(inbuf, 0, n);
-        }
-        result = true;
-    } catch (Exception e){
-        LogLog.error("Compress " + fileName + " to " + scheduledFilename + " failed.");
-        LogLog.error(e.getMessage(), e);
-    } finally {
-        if(gzos!=null) {
-            gzos.close();
-        }
-        if (fis != null) {
-            fis.close();
-        }
-    }
+          File file = new File(fileName);
+          boolean result = false;
+
+          FileInputStream fis = null;
+          FileOutputStream fos = null;
+          GZIPOutputStream gzos = null;
+          try {
+              fis = new FileInputStream(file);
+              fos = new FileOutputStream(target);
+              gzos = new GZIPOutputStream(fos);
+              byte[] inbuf = new byte[8102];
+              int n;
+
+              while ((n = fis.read(inbuf)) != -1) {
+                  gzos.write(inbuf, 0, n);
+              }
+              result = true;
+          } catch (Exception e) {
+              LogLog.error("Compress " + fileName + " to " + scheduledFilename + " failed.");
+              LogLog.error(e.getMessage(), e);
+          } finally {
+              if (gzos != null) {
+                  gzos.close();
+              }
+              if (fis != null) {
+                  fis.close();
+              }
+          }
 
-    if(result) {
-        if (!file.delete()) {
-            LogLog.debug("file delete failed, empty it.");
-            emptyFile(file);
-        }
-      LogLog.debug(fileName +" -> "+ scheduledFilename);
-    } else {
-      LogLog.error("Failed to rename ["+fileName+"] to ["+scheduledFilename+"].");
-    }
+          if (result) {
+              if (!file.delete()) {
+                  LogLog.debug("file delete failed, empty it.");
+                  emptyFile(file);
+              }
+              LogLog.debug(fileName + " -> " + scheduledFilename);
+          } else {
+              LogLog.error("Failed to rename [" + fileName + "] to [" + scheduledFilename + "].");
+          }
 
-    try {
-      // This will also close the file. This is OK since multiple
-      // close operations are safe.
-      this.setFile(fileName, true, this.bufferedIO, this.bufferSize);
-    }
-    catch(IOException e) {
-      errorHandler.error("setFile("+fileName+", true) call failed.");
-    }
-    scheduledFilename = datedFilename;
+          try {
+              // This will also close the file. This is OK since multiple
+              // close operations are safe.
+              this.setFile(fileName, true, this.bufferedIO, this.bufferSize);
+          } catch (IOException e) {
+              errorHandler.error("setFile(" + fileName + ", true) call failed.");
+          }
+          scheduledFilename = datedFilename;
+      }
   }