}
public static void compact(ColumnFamilyStore cfs, Collection<SSTableReader> sstables)
{
int gcBefore = (int) (System.currentTimeMillis() / 1000) - cfs.metadata.getGcGraceSeconds();
AbstractCompactionTask task = cfs.getCompactionStrategy().getUserDefinedTask(sstables, gcBefore);
task.execute(null);
}