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https://issues.apache.org/jira/browse/HADOOP-18003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17692554#comment-17692554
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Takanobu Asanuma commented on HADOOP-18003:
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I added 3.3.5 to fix versions.
> 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: Tao Li
> Assignee: Tao Li
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.4.0, 3.3.5
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> 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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