diff --git a/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileProcessor.java b/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileProcessor.java
index a770882e3d2e..c681eccfe9a9 100644
--- a/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileProcessor.java
+++ b/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileProcessor.java
@@ -469,6 +469,7 @@ private void addAMemtableIntoFlushingList(IMemTable tobeFlushed) throws IOExcept
       totalMemTableSize += tobeFlushed.memSize();
     }
     workMemTable = null;
+    logger.info("register a memtable into FlushManager, memtable size : {}" + tobeFlushed.memSize());
     FlushManager.getInstance().registerTsFileProcessor(this);
   }