[SOLR-12055] Enable async logging by default

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 8.1, 9.0
• Component/s: logging
• Assignee: Erick Erickson
• Reporter: Erick Erickson
• Created: 04/Mar/18 20:18
• Updated: 12/May/22 00:26
• Resolved: 22/Feb/19 21:15

Description

When SOLR-7887 is done, switching to async logging will be a simple change to the config files for log4j2. This will reduce contention and increase throughput generally and logging in particular.

There's a discussion of the pros/cons here: https://logging.apache.org/log4j/2.0/manual/async.html

An alternative is to put a note in the Ref Guide about how to enable async logging.

I guess even if we enable async by default the ref guide still needs a note about how to disable it.....

Issue Links

• contains: SOLR-12753 Async logging ring buffer and OOM error
• depends upon: SOLR-7887 Upgrade Solr to use log4j2 -- log4j 1 now officially end of life
• is related to: SOLR-12753 Async logging ring buffer and OOM error
• is related to: SOLR-13268 Clean up any test failures resulting from defaulting to async logging
• is related to: SOLR-12728 RequestLoggingTest fails on occasion, not reproducible
• is related to: SOLR-12120 New plugin type AuditLoggerPlugin
• is related to: LUCENE-8716 Test logging can bleed from one suite to another, cause failures due to sysout limits