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https://issues.apache.org/jira/browse/HADOOP-18003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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tomscut updated HADOOP-18003:
-----------------------------
    Description: 
As we discussed here [#3635.|#discussion_r746873078]

In some cases, when we need to add a _key:value_ to the {_}CallerContext{_}, we 
need to check whether the _key_ already exists in the outer layer, which is a 
bit of a hassle. To solve this problem, we can add a new method 
{_}CallerContext#appendIfAbsent{_}.

  was:
As we discussed here [#3635.|#discussion_r746873078].]

In some cases, when we need to add a _key:value_ to the {_}CallerContext{_}, we 
need to check whether the _key_ already exists in the outer layer, which is a 
bit of a hassle. To solve this problem, we can add a new method 
{_}CallerContext#appendIfAbsent{_}.


> Add a method appendIfAbsent for CallerContext
> ---------------------------------------------
>
>                 Key: HADOOP-18003
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18003
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: tomscut
>            Assignee: tomscut
>            Priority: Minor
>
> As we discussed here [#3635.|#discussion_r746873078]
> In some cases, when we need to add a _key:value_ to the {_}CallerContext{_}, 
> we need to check whether the _key_ already exists in the outer layer, which 
> is a bit of a hassle. To solve this problem, we can add a new method 
> {_}CallerContext#appendIfAbsent{_}.



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