diff --git a/server/src/main/java/org/apache/iotdb/db/engine/flush/MemTableFlushTask.java b/server/src/main/java/org/apache/iotdb/db/engine/flush/MemTableFlushTask.java
index c643f59a82196..aaf27ff5f0282 100644
--- a/server/src/main/java/org/apache/iotdb/db/engine/flush/MemTableFlushTask.java
+++ b/server/src/main/java/org/apache/iotdb/db/engine/flush/MemTableFlushTask.java
@@ -85,10 +85,12 @@ public MemTableFlushTask(IMemTable memTable, RestorableTsFileIOWriter writer, St
    */
   public void syncFlushMemTable()
       throws ExecutionException, InterruptedException {
-    LOGGER.info("The memTable size of SG {} is {}, the avg series points num in chunk is {} ",
+    LOGGER.info(
+        "The memTable size of SG {} is {}, the avg series points num in chunk is {}, total timeseries number is {}",
         storageGroup,
         memTable.memSize(),
-        memTable.getTotalPointsNum() / memTable.getSeriesNumber());
+        memTable.getTotalPointsNum() / memTable.getSeriesNumber(),
+        memTable.getSeriesNumber());
 
     long estimatedTemporaryMemSize = 0L;
     if (config.isEnableMemControl() && SystemInfo.getInstance().isEncodingFasterThanIo()) {
diff --git a/server/src/main/java/org/apache/iotdb/db/writelog/io/SingleFileLogReader.java b/server/src/main/java/org/apache/iotdb/db/writelog/io/SingleFileLogReader.java
index d504cbcebd7e7..f11f15899e5f0 100644
--- a/server/src/main/java/org/apache/iotdb/db/writelog/io/SingleFileLogReader.java
+++ b/server/src/main/java/org/apache/iotdb/db/writelog/io/SingleFileLogReader.java
@@ -91,7 +91,9 @@ public boolean hasNext() {
       batchLogReader = new BatchLogReader(ByteBuffer.wrap(buffer));
       fileCorrupted = fileCorrupted || batchLogReader.isFileCorrupted();
     } catch (Exception e) {
-      logger.error("Cannot read more PhysicalPlans from {} because", filepath, e);
+      logger.error(
+          "Cannot read more PhysicalPlans from {}, successfully read index is {}. The reason is",
+          idx, filepath, e);
       fileCorrupted = true;
       return false;
     }
@@ -122,6 +124,7 @@ public void close() {
   public void open(File logFile) throws FileNotFoundException {
     close();
     logStream = new DataInputStream(new BufferedInputStream(new FileInputStream(logFile)));
+    logger.info("open WAL file: {} size is {}", logFile.getName(), logFile.length());
     this.filepath = logFile.getPath();
     idx = 0;
   }