// don't even select for compaction if writes are disabled
if (!this.region.areWritesEnabled()) {
return null;
}
CompactionRequest ret = null;
this.lock.readLock().lock();
try {
synchronized (filesCompacting) {
// candidates = all storefiles not already in compaction queue
List<StoreFile> candidates = Lists.newArrayList(storefiles);
if (!filesCompacting.isEmpty()) {
// exclude all files older than the newest file we're currently
// compacting. this allows us to preserve contiguity (HBASE-2856)
StoreFile last = filesCompacting.get(filesCompacting.size() - 1);
int idx = candidates.indexOf(last);
Preconditions.checkArgument(idx != -1);
candidates.subList(0, idx + 1).clear();
}
boolean override = false;
if (region.getCoprocessorHost() != null) {
override = region.getCoprocessorHost().preCompactSelection(
this, candidates);
}
List<StoreFile> filesToCompact;
if (override) {
// coprocessor is overriding normal file selection
filesToCompact = candidates;
} else {
filesToCompact = compactSelection(candidates);
}
if (region.getCoprocessorHost() != null) {
region.getCoprocessorHost().postCompactSelection(this,
ImmutableList.copyOf(filesToCompact));
}
// no files to compact
if (filesToCompact.isEmpty()) {
return null;
}
// basic sanity check: do not try to compact the same StoreFile twice.
if (!Collections.disjoint(filesCompacting, filesToCompact)) {
// TODO: change this from an IAE to LOG.error after sufficient testing
Preconditions.checkArgument(false, "%s overlaps with %s",
filesToCompact, filesCompacting);
}
filesCompacting.addAll(filesToCompact);
Collections.sort(filesCompacting, StoreFile.Comparators.FLUSH_TIME);
// major compaction iff all StoreFiles are included
boolean isMajor = (filesToCompact.size() == this.storefiles.size());
if (isMajor) {
// since we're enqueuing a major, update the compaction wait interval
this.forceMajor = false;
this.majorCompactionTime = getNextMajorCompactTime();
}
// everything went better than expected. create a compaction request
int pri = getCompactPriority();
ret = new CompactionRequest(region, this, filesToCompact, isMajor, pri);
}
} catch (IOException ex) {
LOG.error("Compaction Request failed for region " + region + ", store "
+ this, RemoteExceptionHandler.checkIOException(ex));
} finally {