Hi, We are using C* 2.0.x . What options are available if disk space is too full to do compaction on huge sstables formed by STCS (created around long ago but not getting compacted due to min_compaction_threshold being 4). We suspect that huge space will be released when 2 largest sstables get compacted together such that tombstone eviction is possible. But there is not enough space for compacting them together assuming that compaction would need at least free disk=size of sstable1 + size of sstable 2 ?? I read STCS code and if no sstables are available for compactions, it should pick individual sstable for compaction. But somehow, huge sstables are not participating in individual compaction.. is it due to default 20% tombstone threshold?? And if it so, forceUserdefinedcompaction or setting unchecked_tombstone_compactions to true wont help either as tombstones are less than 20% and not much disk would be recovered. It is not possible to add additional disks too. We see huge difference in disk utilization of different nodes. May be some nodes were able to get away with tombstones while others didnt manage to evict tombstones.
Would be good to know more alternatives from community. ThanksAnuj Sent from Yahoo Mail on Android
