minor

other/java/client/src/main/java/seaweedfs/client/SeaweedRead.java

@@ -62,6 +62,7 @@ public class SeaweedRead {
 
         if (chunkData == null) {
             chunkData = doFetchFullChunkData(chunkView, locations);
+            chunkCache.setChunk(chunkView.fileId, chunkData);
         }
 
         int len = (int) chunkView.size;
@@ -69,8 +70,6 @@ public class SeaweedRead {
                 chunkView.fileId, chunkData.length, chunkView.offset, buffer.length, startOffset, len);
         System.arraycopy(chunkData, (int) chunkView.offset, buffer, startOffset, len);
 
-        chunkCache.setChunk(chunkView.fileId, chunkData);
-
         return len;
     }