[LU-12871] enable changelog garbage collection by default

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Affects Version/s: Lustre 2.13.0, Lustre 2.12.3
• Assignee: Andreas Dilger
• Reporter: Andreas Dilger

Description

This feature was disabled by default in commit v2_10_56_0-2-g3442db6fa (2.11.0) and was fixed in commit v2_11_52_0-59-g31fef6845e (2.12), but was not re-enabled again by default.

This is a very useful functionality as sites often register Changelog users but forget to remove them, causing problems with the MDT running out of space or the Changelog becoming full. Enable it again by default.

Issue Links

• is related to: LU-12865 sanity test 160f fails with ‘mds1: User cl6 not registered’
• is related to: LU-14699 changelog garbage collection is too lax
• is related to: LU-17290 Don't deregister idle changelog consumers
• is related to: LU-10680 MDT becoming unresponsive in 2.10.3
• is related to: LU-7340 ChangeLogs catalog full condition should be handled more gracefully