tomscut created HADOOP-18003:
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Summary: 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
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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