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https://issues.apache.org/jira/browse/HDFS-11395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15881058#comment-15881058
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Arpit Agarwal commented on HDFS-11395:
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bq. Is there any other check that can be performed to identify the proper
exception to throw back to client?
Yes we need to decide which exception to throw to the client if the failure is
decided to be non-retriable.
We want to retain the exception other than StandbyException. If we have more
than one such exception (should be rare), it may be okay to throw the first one
in the list (needs more thought).
If all NameNodes are standby then we should retain the same behavior we have
today with ConfiguredFailoverProxyProvider.
> 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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