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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2936) YARNDelegationTokenIdentifier doesn't set proto.builder now
Date Sun, 28 Dec 2014 01:22:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-2936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14259545#comment-14259545
] 

Jian He commented on YARN-2936:
-------------------------------

thanks, looks good, mind writing a unit test? TestYARNTokenIdentifier.java has some existing
tests.

> YARNDelegationTokenIdentifier doesn't set proto.builder now
> -----------------------------------------------------------
>
>                 Key: YARN-2936
>                 URL: https://issues.apache.org/jira/browse/YARN-2936
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Zhijie Shen
>            Assignee: Varun Saxena
>         Attachments: YARN-2936.001.patch, YARN-2936.002.patch
>
>
> After YARN-2743, the setters are removed from YARNDelegationTokenIdentifier, such that
when constructing a object which extends YARNDelegationTokenIdentifier, proto.builder is not
set at all. Later on, when we call getProto() of it, we will just get an empty proto object.
> It seems to do no harm to the production code path, as we will always call getBytes()
before using proto to persist the DT in the state store, when we generating the password.
> I think the setter is removed to avoid duplicating setting the fields why getBytes()
is called. However, YARNDelegationTokenIdentifier doesn't work properly alone. YARNDelegationTokenIdentifier
is tightly coupled with the logic in secretManager. It's vulnerable if something is changed
at secretManager. For example, in the test case of YARN-2837, I spent time to figure out we
need to execute getBytes() first to make sure the testing DTs can be properly put into the
state store.



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