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185338c8cf
Normally, the space overhead for TWCS is 1/N, where is number of windows. But during off-strategy, the overhead is 100% because input sstables cannot be released earlier. Reshaping a TWCS table that takes ~50% of available space can result in system running out of space. That's fixed by restricting every TWCS off-strategy job to 10% of free space in disk. Tables that aren't big will not be penalized with increased write amplification, as all input (disjoint) sstables can still be compacted in a single round. Fixes #16514. Closes scylladb/scylladb#18137 * github.com:scylladb/scylladb: compaction: Reduce twcs off-strategy space overhead to 10% of free space compaction: wire storage free space into reshape procedure sstables: Allow to get free space from underlying storage replica: don't expose compaction_group to reshape task