/**
* @param gcBefore
* @return
*/
private List<SSTableReader> getNextBackgroundSSTables(final int gcBefore) {
if (!isEnabled() || cfs.getSSTables().isEmpty()) return Collections.emptyList();
Set<SSTableReader> uncompacting = Sets.intersection(sstables, cfs.getUncompactingSSTables());
// Find fully expired SSTables. Those will be included no matter what.
Set<SSTableReader> expired =
CompactionController.getFullyExpiredSSTables(
cfs, uncompacting, cfs.getOverlappingSSTables(uncompacting), gcBefore);
Set<SSTableReader> candidates = Sets.newHashSet(filterSuspectSSTables(uncompacting));
List<SSTableReader> compactionCandidates =
new ArrayList<>(getNextNonExpiredSSTables(Sets.difference(candidates, expired), gcBefore));
if (!expired.isEmpty()) {
logger.debug("Including expired sstables: {}", expired);
compactionCandidates.addAll(expired);
}
return compactionCandidates;
}
