virajith commented on a change in pull request #1726: [WIP] Syncservice rebased 
onto HDFS-12090
URL: https://github.com/apache/hadoop/pull/1726#discussion_r352255563
 
 

 ##########
 File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/HdfsServerConstants.java
 ##########
 @@ -368,6 +368,7 @@ public void write(DataOutput out) throws IOException {
       "system.hdfs.erasurecoding.policy";
 
   String XATTR_SATISFY_STORAGE_POLICY = "user.hdfs.sps";
+  String XATTR_SYNC_TO_EXTERNAL = "user.hdfs.sync";
 
 Review comment:
   How is this XAttr used? I currently see this accessed only in 
`FSDirSyncNodeToRemoteStoreOp`

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