[jira] [Commented] (HDFS-4506) In branch-1, HDFS short circuit fails non-transparently when user does not have unix permissions

["Kousuke Saruta (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-4506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829474#comment-13829474 ] 

Kousuke Saruta commented on HDFS-4506:
--------------------------------------

getLocalBLockReader calls BlockReaderLocal.newBlockReader and newBlockReader accesses local file. When we access local files with FileInputStream ( and subclasses ) without proper permission, FileNotFoundException will be thrown. So, can we modify like as follows?

{code}
  private BlockReader getLocalBlockReader(Configuration conf,
      String src, Block blk, Token<BlockTokenIdentifier> accessToken,
      DatanodeInfo chosenNode, int socketTimeout, long offsetIntoBlock)
      throws InvalidToken, IOException {
    try {
      return BlockReaderLocal.newBlockReader(conf, src, blk, accessToken,
          chosenNode, socketTimeout, offsetIntoBlock, blk.getNumBytes()
              - offsetIntoBlock, connectToDnViaHostname);
-    } catch (RemoteException re) {
-      throw re.unwrapRemoteException(InvalidToken.class,
-          AccessControlException.class);
+    } catch (FileNotFoundException fe) {
+      throw new AcceccControlException(fe);
+    } catch (IOException ie) {
+      throw ie;
     }
   }
{code}

> In branch-1, HDFS short circuit fails non-transparently when user does not have unix permissions
> ------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4506
>                 URL: https://issues.apache.org/jira/browse/HDFS-4506
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 1.1.1
>            Reporter: Enis Soztutar
>
> We found a case, where if the short circuit user name is configured correctly, but the user does not have enough permissions in unix, DFS operations fails with IOException, rather than silently failing over through datanode. 



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