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https://issues.apache.org/jira/browse/HDFS-16865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17654666#comment-17654666
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ASF GitHub Bot commented on HDFS-16865:
---------------------------------------

ayushtkn commented on code in PR #5200:
URL: https://github.com/apache/hadoop/pull/5200#discussion_r1061936677


##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterClientProtocol.java:
##########
@@ -465,6 +465,24 @@ public void setOwner(String src, String username, String 
groupname)
     }
   }
 
+  /**
+   * Try to get the remote location whose bpId is same with the input bpId 
from the input locations.
+   * @param locations the input RemoteLocations.
+   * @param bpId the input bpId.
+   * @return the remote location whose bpId is same with the input.
+   * @throws IOException
+   */
+  private RemoteLocation getLocationWithBPID(List<RemoteLocation> locations, 
String bpId)
+      throws IOException {
+    String nsId = rpcClient.getNameserviceForBlockPoolId(bpId);
+    for (RemoteLocation l : locations) {
+      if (l.getNameserviceId().equals(nsId)) {
+        return l;
+      }
+    }
+    throw new IOException("Can't found remote locations for the " + bpId);

Review Comment:
   This throwing exception ain't backward compatible.
   Like:
   * Create a file
   * Add some blocks
   * The mount entry gets deleted
   * Call complete to close
   * Earlier: The file would have got successfully closed, but now it will 
throw an exception.





> RBF: The source path is always / after RBF proxied the complete, addBlock and 
> getAdditionalDatanode RPC.
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-16865
>                 URL: https://issues.apache.org/jira/browse/HDFS-16865
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: ZanderXu
>            Assignee: ZanderXu
>            Priority: Major
>              Labels: pull-request-available
>
> The source path is always / after RBF proxied the complete, addBlock and 
> getAdditionalDatanode RPC.



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