HubSpot Backport: HBASE-28680 BackupLogCleaner causes HMaster WALs to pile up indefintely (#6006) #100
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…ely (apache#6006) We have been trying to setup daily incremental backups for hundreds of clusters at my day job. Recently we discovered that old WALs were piling up across many clusters inline with when we began running incremental backups. This led to the realization that the BackupLogCleaner will always skip archived HMaster WALs. This is a problem because, if a cleaner is skipping a given file, then the CleanerChore will never delete it. This seems like a misunderstanding of what it means to "skip" a WAL in a BaseLogCleanerDelegate, and, instead, we should always return these HMaster WALs as deletable from the perspective of the BackupLogCleaner. We could subject them to the same scrutiny as RegionServer WALs: are they older than the most recent successful backup? But, if I understand correctly, HMaster WALs do not contain any data relevant to table backups, so that would be unnecessary. Co-authored-by: Ray Mattingly <rmattingly@hubspot.com> Signed-off-by: Nick Dimiduk <ndimiduk@apache.org>
rmdmattingly
requested review from
charlesconnell,
ndimiduk,
aalhour and
ksravista
ndimiduk
approved these changes
Jun 26, 2024
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
We have been trying to setup daily incremental backups for hundreds of clusters at my day job. Recently we discovered that old WALs were piling up across many clusters inline with when we began running incremental backups.
This led to the realization that the BackupLogCleaner will always skip archived HMaster WALs. This is a problem because, if a cleaner is skipping a given file, then the CleanerChore will never delete it.
This seems like a misunderstanding of what it means to "skip" a WAL in a BaseLogCleanerDelegate, and, instead, we should always return these HMaster WALs as deletable from the perspective of the BackupLogCleaner. We could subject them to the same scrutiny as RegionServer WALs: are they older than the most recent successful backup? But, if I understand correctly, HMaster WALs do not contain any data relevant to table backups, so that would be unnecessary.