[YARN-10779] Add option to disable lowercase conversion in GetApplicationsRequestPBImpl and ApplicationSubmissionContextPBImpl

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.4.0
• Component/s: resourcemanager
• Hadoop Flags: Reviewed
• Assignee: Peter Bacsko
• Reporter: Peter Bacsko
• Created: 19/May/21 09:38
• Updated: 21/May/21 16:05
• Resolved: 21/May/21 16:05

Description

In both GetApplicationsRequestPBImpl and ApplicationSubmissionContextPBImpl, there is a forced lowercase conversion:

    checkTags(tags);
    // Convert applicationTags to lower case and add
    this.applicationTags = new TreeSet<>();
    for (String tag : tags) {
      this.applicationTags.add(StringUtils.toLowerCase(tag));
    }
  }

However, we encountered some cases where this is not desirable for "userid" tags.

Proposed solution: since both classes are pretty low-level and can be often instantiated, a Configuration object which loads yarn-site.xml should be cached inside them. A new property should be created which tells whether lowercase conversion should occur or not.