diff --git a/leveldb/src/main/java/org/iq80/leveldb/impl/FileMetaData.java b/leveldb/src/main/java/org/iq80/leveldb/impl/FileMetaData.java
index cf32c5df..151e1be7 100644
--- a/leveldb/src/main/java/org/iq80/leveldb/impl/FileMetaData.java
+++ b/leveldb/src/main/java/org/iq80/leveldb/impl/FileMetaData.java
@@ -48,8 +48,8 @@ public FileMetaData(long number, long fileSize, InternalKey smallest, InternalKe
     {
         this.number = number;
         this.fileSize = fileSize;
-        this.smallest = smallest;
-        this.largest = largest;
+        this.smallest = smallest.compressed();
+        this.largest = largest.compressed();
     }
 
     public long getFileSize()
diff --git a/leveldb/src/main/java/org/iq80/leveldb/impl/InternalKey.java b/leveldb/src/main/java/org/iq80/leveldb/impl/InternalKey.java
index 1b9fa73e..7ed0204d 100644
--- a/leveldb/src/main/java/org/iq80/leveldb/impl/InternalKey.java
+++ b/leveldb/src/main/java/org/iq80/leveldb/impl/InternalKey.java
@@ -140,4 +140,9 @@ private static Slice getUserKey(Slice data)
     {
         return data.slice(0, data.length() - SIZE_OF_LONG);
     }
+
+    public InternalKey compressed()
+    {
+        return new InternalKey(this.userKey.compressed(), sequenceNumber, valueType);
+    }
 }
diff --git a/leveldb/src/main/java/org/iq80/leveldb/util/Slice.java b/leveldb/src/main/java/org/iq80/leveldb/util/Slice.java
index 0605e771..351bb68c 100644
--- a/leveldb/src/main/java/org/iq80/leveldb/util/Slice.java
+++ b/leveldb/src/main/java/org/iq80/leveldb/util/Slice.java
@@ -43,6 +43,8 @@
 public final class Slice
         implements Comparable<Slice>
 {
+    static final int COMPRESSION_THRESHOLD = 1024;
+
     private final byte[] data;
     private final int offset;
     private final int length;
@@ -717,4 +719,15 @@ public String toString()
                 "length=" + length() +
                 ')';
     }
+
+    /**
+     * get compressed slice if data.length - length >= 1kb
+     */
+    public Slice compressed()
+    {
+        if (this.data.length - length < COMPRESSION_THRESHOLD) {
+            return this;
+        }
+        return new Slice(getBytes());
+    }
 }