boolean override = false;
if (region.getCoprocessorHost() != null) {
override = region.getCoprocessorHost().preCompactSelection(this, candidates, request);
}
CompactSelection filesToCompact;
if (override) {
// coprocessor is overriding normal file selection
filesToCompact = new CompactSelection(conf, candidates);
} else {
filesToCompact = compactSelection(candidates, priority);
}
if (region.getCoprocessorHost() != null) {
region.getCoprocessorHost().postCompactSelection(this,
ImmutableList.copyOf(filesToCompact.getFilesToCompact()), request);
}
// no files to compact
if (filesToCompact.getFilesToCompact().isEmpty()) {
return null;
}
// basic sanity check: do not try to compact the same StoreFile twice.
if (!Collections.disjoint(filesCompacting, filesToCompact.getFilesToCompact())) {
// TODO: change this from an IAE to LOG.error after sufficient testing
Preconditions.checkArgument(false, "%s overlaps with %s",
filesToCompact, filesCompacting);
}
filesCompacting.addAll(filesToCompact.getFilesToCompact());
Collections.sort(filesCompacting, StoreFile.Comparators.FLUSH_TIME);
// major compaction iff all StoreFiles are included
boolean isMajor = (filesToCompact.getFilesToCompact().size() == this.storefiles.size());
if (isMajor) {
// since we're enqueuing a major, update the compaction wait interval
this.forceMajor = false;
}