avijayanhwx commented on a change in pull request #1819: HDFS-14989. Add a 
'swapBlockList' operation to Namenode.
URL: https://github.com/apache/hadoop/pull/1819#discussion_r373236453
 
 

 ##########
 File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java
 ##########
 @@ -2667,4 +2667,15 @@ public Long getNextSPSPath() throws IOException {
     }
     return namesystem.getBlockManager().getSPSManager().getNextPathId();
   }
+
+  public boolean swapBlockList(String src, String dst, long maxTimestamp)
+      throws IOException {
+    checkNNStartup();
+    if (stateChangeLog.isDebugEnabled()) {
+      stateChangeLog.debug("*DIR* NameNode.swapBlockList: {} and {}", src, 
dst);
+    }
+    namesystem.checkOperation(OperationCategory.WRITE);
 
 Review comment:
   Fixed this.

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