[HADOOP-18669] Remove Log4Json Layout

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: common
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Viraj Jasani
• Reporter: Viraj Jasani
• Created: 18/Mar/23 05:39
• Updated: 27/Jan/24 08:33
• Resolved: 21/Mar/23 02:07

Description

Log4Json extends org.apache.log4j.Layout to provide log layout for Json. This utility is not being used anywhere in Hadoop. It is IA.Private (by default).

Log4j2 has introduced drastic changes to the Layout. It also converted it as an interface. Log4j2 also has JsonLayout, it provides options like Pretty vs. compact JSON, Encoding UTF-8 or UTF-16, Complete well-formed JSON vs. fragment JSON, addition of custom fields into generated JSON

https://github.com/apache/logging-log4j2/blob/2.x/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/JsonLayout.java

 

This utility is more suitable to be part of log4j project rather than hadoop because the maintenance cost in hadoop would be higher with any more upgrades introducing changes to the Layout format.

Issue Links

• links to: GitHub Pull Request #5493