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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7202) End-to-end UT for api-server
Date Wed, 27 Sep 2017 16:58:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182886#comment-16182886

Eric Yang commented on YARN-7202:

[~jianhe] In the example that you provided, it is showing what ApiServer would behave and
what is expected from ServiceClient.  If ServiceClient throws YarnException for NOT_FOUND,
and ApiServer does not capturing YarnException to treat it as NOT_FOUND, then we look at the
reason for the discrepancy.  We know ServiceClient will throw YarnException for various errors,
including NOT_FOUND.  However, ServiceClient does not provide more details for ApiServer to
identify the difference between NOT_FOUND, and INTERNAL_SERVER_ERROR by looking at YarnException.
 Hence, the mocked version of ServiceClient is verifying how ApiServer would behave under
all conditions that ApiServer covered.  The ambiguity does not come from ApiServer.  If both
mocked version of ServiceClient, and ApiServer are behaving correctly.  The ambiguity problem
must be originated from ServiceClient.  This verification confirms that unit test for ApiServer
is done correctly, and problem resides in ServiceClient.  If we peel off layer and layer of
ambiguity, then we have a good suite of unit test cases that can be repeated and reproduced.

ServiceClient code is inherited from Apache Slider.  There are too many integration classes
with external dependencies.  It won't be easy to write unit test cases in one task.  I would
proposed to write unit test cases in separate JIRAs as we continue to trim down the framework
to make up for the technical debts from Apache Slider.

> End-to-end UT for api-server
> ----------------------------
>                 Key: YARN-7202
>                 URL: https://issues.apache.org/jira/browse/YARN-7202
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Jian He
>         Attachments: YARN-7202.yarn-native-services.001.patch, YARN-7202.yarn-native-services.002.patch

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