[jira] [Commented] (HDFS-11395) RequestHedgingProxyProvider#RequestHedgingInvocationHandler hides the Exception thrown from NameNode

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

    [ https://issues.apache.org/jira/browse/HDFS-11395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15857689#comment-15857689 ] 

Nandakumar commented on HDFS-11395:
-----------------------------------

If we get RemoteException other than {{StandbyException}}, it is safe to throw it rather than wrapping it into {{MultiException}}.

[~arpitagarwal] any comment or suggestion on this?

> RequestHedgingProxyProvider#RequestHedgingInvocationHandler hides the Exception thrown from NameNode
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-11395
>                 URL: https://issues.apache.org/jira/browse/HDFS-11395
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>            Reporter: Nandakumar
>            Assignee: Nandakumar
>
> When using RequestHedgingProxyProvider, in case of Exception (like FileNotFoundException) from ActiveNameNode, {{RequestHedgingProxyProvider#RequestHedgingInvocationHandler.invoke}} receives {{ExecutionException}} since we use {{CompletionService}} for the call. The ExecutionException is put into a map and wrapped with {{MultiException}}.
> So for a FileNotFoundException the client receives {{MultiException(Map(ExecutionException(InvocationTargetException(RemoteException(FileNotFoundException)))))}}
> It will cause problem in clients which are handling RemoteExceptions.



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