[HADOOP-18003] Add a method appendIfAbsent for CallerContext

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.4.0, 3.3.5
• Fix Version/s: 3.4.0, 3.3.5
• Component/s: common
• Labels: pull-request-available
• Target Version/s: 3.4.0, 3.3.5
• Hadoop Flags: Reviewed
• Assignee: Tao Li
• Reporter: Tao Li
• Created: 11/Nov/21 01:47
• Updated: 11/Feb/24 04:10
• Resolved: 15/Nov/21 13:46

Description

As we discussed here #3635.

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.

Issue Links

• is depended upon by: HDFS-16310 RBF: Add client port to CallerContext for Router
• links to: GitHub Pull Request #3644