[TEZ-2222] Investigate moving to log4j2 for logging

• Type: Improvement
• Status: Open
• Priority: Blocker
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Siddharth Seth
• Created: 23/Mar/15 21:39
• Updated: 19/Mar/19 16:09

Description

Via slf4j.

Some bits to keep in mind

• We have explicit code which rotates logs using direct log4j12 APIs. This should keep working. I believe the log4j2 APIs are different here
• API compatibility between log4j12 / log4j2 can be problematic - if both end up on the classpath (I believe the APIs are different)
• Hadoop dist includes a slf4j-log4j12 binding. Changing the default can result in sl4j-log4j12 and slf4j-log4j2 to co-exist by default - which could be problematic. Needs investigation.

End of the day, we will likely need an option to use either of the two.

Issue Links

• relates to: TEZ-4039 Tez should inject dag id, query id into MDC