b8194b4902
- MOB compaction is now handled in-line with per-region compaction on region servers - regions with mob data store per-hfile metadata about which mob hfiles are referenced - admin requested major compaction will also rewrite MOB files; periodic RS initiated major compaction will not - periodically a chore in the master will initiate a major compaction that will rewrite MOB values to ensure it happens. controlled by 'hbase.mob.compaction.chore.period'. default is weekly - control how many RS the chore requests major compaction on in parallel with 'hbase.mob.major.compaction.region.batch.size'. default is as parallel as possible. - periodic chore in master will scan backing hfiles from regions to get the set of referenced mob hfiles and archive those that are no longer referenced. control period with 'hbase.master.mob.cleaner.period' - Optionally, RS that are compacting mob files can limit write amplification by not rewriting values from mob hfiles over a certain size limit. opt-in by setting 'hbase.mob.compaction.type' to 'optimized'. control threshold by 'hbase.mob.compactions.max.file.size'. default is 1GiB - Should smoothly integrate with existing MOB users via rolling upgrade. will delay old MOB file cleanup until per-region compaction has managed to compact each region at least once so that used mob hfile metadata can be gathered. |
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