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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11395) RequestHedgingProxyProvider#RequestHedgingInvocationHandler hides the Exception thrown from NameNode
Date Tue, 21 Feb 2017 22:54:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15876930#comment-15876930
] 

Arpit Agarwal commented on HDFS-11395:
--------------------------------------

Thanks for reporting this [~nanda131].

Short-circuiting the execution looks wrong.
{code}
            RemoteException rEx = getRemoteException(ex);
            if(rEx !=null && !isStandbyException(ex)) {
              throw rEx;
            }
{code}

However your change to unwrap the RemoteException is correct. What happens if you throw the
unwrapped RemoteExceptions via MultiException i.e. throw {{MultiException(RemoteException(Exception1),
RemoteException(Exception2))}}?

> 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
>         Attachments: HDFS-11395.000.patch
>
>
> 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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