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From "John Zhuge (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15056) Fix TestUnbuffer#testUnbufferException failure
Date Thu, 30 Nov 2017 05:40:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16272192#comment-16272192
] 

John Zhuge commented on HADOOP-15056:
-------------------------------------

IMHO, it is not a good idea to swallow CCE and just log.

In the try block, StreamCapabilities#hasCapabilities has to be called, because this is the
new algorithm introduced by HADOOP-15012.: an input stream should be queried about its capability
UNBUFFER before unbuffer is called. Casting to CanUnbuffer should always succeed in this case.

> Fix TestUnbuffer#testUnbufferException failure
> ----------------------------------------------
>
>                 Key: HADOOP-15056
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15056
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.9.0
>            Reporter: Jack Bearden
>            Assignee: Jack Bearden
>            Priority: Minor
>         Attachments: HADOOP-15056.001.patch, HADOOP-15056.002.patch
>
>
> Hello! I am a new contributor and actually contributing to open source for the very first
time. :) 
> I pulled down Hadoop today and when running the tests I encountered a failure with the
TestUnbuffer#testUnbufferException test.
> The unbuffer code has recently gone through some changes and I believe this test case
may have been overlooked. Using today's git commit (659e85e304d070f9908a96cf6a0e1cbafde6a434),
and upon running the test case, there is an expect mock for an exception UnsupportedOperationException
that is no longer being thrown. 
> It would appear that a test like this would be valuable so my initial proposed patch
did not remove it. Instead, I removed the conditions that were guarding the cast from being
able to fire -- as was the previous behavior. Now when we encounter an object that doesn't
have the UNBUFFERED StreamCapability, it will throw an error as it did prior to the recent
changes. 
> Please review and let me know what you think! :D



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