Nandakumar created HDFS-11395:
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Summary:
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 the RemoteExceptions.
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