disable follower wal

server/src/main/java/org/apache/iotdb/db/wal/node/WALNode.java

diff --git a/server/src/main/java/org/apache/iotdb/db/wal/node/WALNode.java b/server/src/main/java/org/apache/iotdb/db/wal/node/WALNode.java
index 8484189..af373e6 100644
--- a/server/src/main/java/org/apache/iotdb/db/wal/node/WALNode.java
+++ b/server/src/main/java/org/apache/iotdb/db/wal/node/WALNode.java
@@ -129,6 +129,9 @@
 
   @Override
   public WALFlushListener log(long memTableId, InsertRowNode insertRowNode) {
+    if (fromLeader(insertRowNode.getSearchIndex())) {
+      return new WALFlushListener(false);
+    }
     WALEntry walEntry = new WALInfoEntry(memTableId, insertRowNode);
     return log(walEntry);
   }
@@ -136,16 +139,26 @@
   @Override
   public WALFlushListener log(
       long memTableId, InsertTabletNode insertTabletNode, int start, int end) {
+    if (fromLeader(insertTabletNode.getSearchIndex())) {
+      return new WALFlushListener(false);
+    }
     WALEntry walEntry = new WALInfoEntry(memTableId, insertTabletNode, start, end);
     return log(walEntry);
   }
 
   @Override
   public WALFlushListener log(long memTableId, DeleteDataNode deleteDataNode) {
+    if (fromLeader(deleteDataNode.getSearchIndex())) {
+      return new WALFlushListener(false);
+    }
     WALEntry walEntry = new WALInfoEntry(memTableId, deleteDataNode);
     return log(walEntry);
   }
 
+  private boolean fromLeader(long searchIndex) {
+    return searchIndex == DEFAULT_SEARCH_INDEX;
+  }
+
   private WALFlushListener log(WALEntry walEntry) {
     buffer.write(walEntry);
     return walEntry.getWalFlushListener();