diff --git a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/codec/StringValueCodec.java b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/codec/StringValueCodec.java
index f50a1b6cc..32937fbc4 100644
--- a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/codec/StringValueCodec.java
+++ b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/codec/StringValueCodec.java
@@ -19,7 +19,7 @@
  */
 public class StringValueCodec {
 
-    public static List<BlockInfo> encode(short slot, BlockType blockType, IValueManifest valueManifest, List<Pair<KeyInfo, byte[]>> values) throws IOException {
+    public static StringValueCodecResult encode(short slot, BlockType blockType, IValueManifest valueManifest, List<Pair<KeyInfo, byte[]>> values) throws IOException {
         //
         //data to sub-block
         List<SubBlock> subBlocks = new ArrayList<>();
@@ -80,6 +80,7 @@ public static List<BlockInfo> encode(short slot, BlockType blockType, IValueMani
 
         //sub-block to block
         List<BlockInfo> blockInfos = new ArrayList<>();
+        List<ValueLocation> oldLocations = new ArrayList<>();
 
         {
             //new block
@@ -111,7 +112,10 @@ public static List<BlockInfo> encode(short slot, BlockType blockType, IValueMani
                 buffer.putInt(block.compressLen);
                 buffer.put(block.compressed);
                 for (KeyInfo keyInfo : block.keyInfos) {
-                    keyInfo.setValueLocation(new ValueLocation(location, offset));
+                    ValueLocation valueLocation = keyInfo.setValueLocation(new ValueLocation(location, offset));
+                    if (valueLocation != null) {
+                        oldLocations.add(valueLocation);
+                    }
                     offset++;
                 }
                 subBlockCount++;
@@ -122,7 +126,7 @@ public static List<BlockInfo> encode(short slot, BlockType blockType, IValueMani
             buffer.putShort(4, subBlockCount);
             blockInfos.add(new BlockInfo(blockType, location, buffer.array()));
         }
-        return blockInfos;
+        return new StringValueCodecResult(blockInfos, oldLocations);
     }
 
     public static List<byte[]> decode(byte[] data, BlockType blockType) {
diff --git a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/key/KeyInfo.java b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/key/KeyInfo.java
index 78b3afbdf..e55ea6d65 100644
--- a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/key/KeyInfo.java
+++ b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/key/KeyInfo.java
@@ -107,13 +107,15 @@ public void setExtra(byte[] extra) {
         }
     }
 
-    public void setValueLocation(ValueLocation valueLocation) {
+    public ValueLocation setValueLocation(ValueLocation valueLocation) {
+        ValueLocation oldValueLocation = this.valueLocation;
         this.valueLocation = valueLocation;
         if (valueLocation != null) {
             setContainsValue();
         } else {
             clearContainsValue();
         }
+        return oldValueLocation;
     }
 
     public ValueLocation getValueLocation() {
diff --git a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/IValueManifest.java b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/IValueManifest.java
index d35f0716f..a703d670a 100644
--- a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/IValueManifest.java
+++ b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/IValueManifest.java
@@ -41,11 +41,11 @@ public interface IValueManifest {
 
 
     /**
-     * clear
+     * recycle
      * @param slot slot
      * @param blockLocation location
      * @throws IOException exception
      */
-    void clear(short slot, BlockLocation blockLocation) throws IOException;
+    void recycle(short slot, BlockLocation blockLocation) throws IOException;
 
 }
diff --git a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/StringValueCodecResult.java b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/StringValueCodecResult.java
new file mode 100644
index 000000000..cfcfe9798
--- /dev/null
+++ b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/StringValueCodecResult.java
@@ -0,0 +1,10 @@
+package com.netease.nim.camellia.redis.proxy.upstream.embedded.storage.value.block;
+
+import java.util.List;
+
+/**
+ * Created by caojiajun on 2025/1/8
+ */
+public record StringValueCodecResult(List<BlockInfo> blockInfos, List<ValueLocation> oldLocations) {
+
+}
diff --git a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/ValueManifest.java b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/ValueManifest.java
index 5bfe9bcf3..e9fc3a3ae 100644
--- a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/ValueManifest.java
+++ b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/block/ValueManifest.java
@@ -81,7 +81,7 @@ public void commit(short slot, BlockLocation blockLocation) throws IOException {
         //
         BitSet bitSet1 = bits1Map.get(fileId);
         if (!bitSet1.get(blockId)) {
-            throw new IOException("blockId not allocated");
+            throw new IOException("fileId=" + fileId + ",blockId=" + blockId + " not allocated");
         }
         //bits2
         BitSet bitSet2 = bits2Map.get(fileId);
@@ -98,21 +98,25 @@ public void commit(short slot, BlockLocation blockLocation) throws IOException {
     }
 
     @Override
-    public void clear(short slot, BlockLocation blockLocation) throws IOException {
+    public void recycle(short slot, BlockLocation blockLocation) throws IOException {
         long fileId = blockLocation.fileId();
         int blockId = blockLocation.blockId();
         //bits1
-        bits1Map.get(fileId).set(blockId, false);
+        BitSet bitSet1 = bits1Map.get(fileId);
+        if (!bitSet1.get(blockId)) {
+            throw new IOException("fileId=" + fileId + ",blockId=" + blockId + " not allocated");
+        }
+        bitSet1.set(blockId, false);
         Integer offset = allocateOffsetMap.get(fileId);
         if (offset > blockId) {
             allocateOffsetMap.put(fileId, blockId);
         }
         //bits2
-        BitSet bitSet = bits2Map.get(fileId);
-        bitSet.set(blockId, false);
+        BitSet bitSet2 = bits2Map.get(fileId);
+        bitSet2.set(blockId, false);
         //update file
         int index = blockId / 64;
-        long[] longArray = bitSet.toLongArray();
+        long[] longArray = bitSet2.toLongArray();
         long changed;
         if (longArray.length > index) {
             changed = longArray[index];
diff --git a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/persist/ValueFlushExecutor.java b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/persist/ValueFlushExecutor.java
index 11252d5b4..45b7dd681 100644
--- a/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/persist/ValueFlushExecutor.java
+++ b/camellia-redis-proxy/camellia-redis-proxy-core/src/main/java/com/netease/nim/camellia/redis/proxy/upstream/embedded/storage/value/persist/ValueFlushExecutor.java
@@ -11,10 +11,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 import java.util.concurrent.CompletableFuture;
 
 /**
@@ -66,9 +63,11 @@ private void execute(StringValueFlushTask task) throws Exception {
             buffers.add(new Pair<>(entry.getKey(), entry.getValue()));
         }
         List<BlockInfo> list = new ArrayList<>();
+        List<ValueLocation> oldLocations = new ArrayList<>();
         for (Map.Entry<BlockType, List<Pair<KeyInfo, byte[]>>> entry : blockMap.entrySet()) {
-            List<BlockInfo> blockInfos = StringValueCodec.encode(slot, entry.getKey(), valueManifest, entry.getValue());
-            list.addAll(blockInfos);
+            StringValueCodecResult result = StringValueCodec.encode(slot, entry.getKey(), valueManifest, entry.getValue());
+            list.addAll(result.blockInfos());
+            oldLocations.addAll(result.oldLocations());
         }
         for (BlockInfo blockInfo : list) {
             BlockLocation blockLocation = blockInfo.blockLocation();
@@ -76,7 +75,16 @@ private void execute(StringValueFlushTask task) throws Exception {
             long offset = (long) blockLocation.blockId() * blockInfo.blockType().getBlockSize();
             fileReadWrite.write(fileId, offset, blockInfo.data());
             blockCache.updateBlockCache(slot, fileId, offset, blockInfo.data());
+            valueManifest.commit(slot, blockLocation);
         }
+        Set<BlockLocation> changedBlocks = new HashSet<>();
+        for (ValueLocation oldLocation : oldLocations) {
+            changedBlocks.add(oldLocation.blockLocation());
+        }
+        compact(changedBlocks);
     }
 
+    private void compact(Set<BlockLocation> blocks) {
+        //todo
+    }
 }
diff --git a/camellia-redis-proxy/camellia-redis-proxy-core/src/test/java/com/netease/nim/camellia/redis/proxy/test/StringValueCodecTest.java b/camellia-redis-proxy/camellia-redis-proxy-core/src/test/java/com/netease/nim/camellia/redis/proxy/test/StringValueCodecTest.java
index 753ee2031..316ae75d9 100644
--- a/camellia-redis-proxy/camellia-redis-proxy-core/src/test/java/com/netease/nim/camellia/redis/proxy/test/StringValueCodecTest.java
+++ b/camellia-redis-proxy/camellia-redis-proxy-core/src/test/java/com/netease/nim/camellia/redis/proxy/test/StringValueCodecTest.java
@@ -39,7 +39,7 @@ public void test() throws IOException {
         values.add(new Pair<>(keyInfo("k6", 1000L, null, null), "1k12l12121".getBytes(StandardCharsets.UTF_8)));
         values.add(new Pair<>(keyInfo("k7", 1000L, null, null), "sasasas".getBytes(StandardCharsets.UTF_8)));
 
-        List<BlockInfo> blockInfos = StringValueCodec.encode(slot, blockType, valueManifest, values);
+        List<BlockInfo> blockInfos = StringValueCodec.encode(slot, blockType, valueManifest, values).blockInfos();
 
         Assert.assertEquals(blockInfos.size(), 1);
 
@@ -65,7 +65,7 @@ public void test2() throws IOException {
             values.add(new Pair<>(keyInfo("k" + i, 1000L, null, null), UUID.randomUUID().toString().getBytes(StandardCharsets.UTF_8)));
         }
 
-        List<BlockInfo> blockInfos = StringValueCodec.encode(slot, blockType, valueManifest, values);
+        List<BlockInfo> blockInfos = StringValueCodec.encode(slot, blockType, valueManifest, values).blockInfos();
 
         for (int i=0;i<blockInfos.size(); i++) {
             BlockInfo blockInfo = blockInfos.get(i);
@@ -125,7 +125,7 @@ public void commit(short slot, BlockLocation blockLocation) throws IOException {
         }
 
         @Override
-        public void clear(short slot, BlockLocation blockLocation) throws IOException {
+        public void recycle(short slot, BlockLocation blockLocation) throws IOException {
 
         }
     }