code: protected boolean consumeCompactionBatch() {
          /*
           * Consume one compaction update batch generated by the compactor.
           */
          CompactionUpdateBatch updateBatch = _compactor.pollCompactionBatch();
          if(updateBatch != null) {
              try {
                  consumeCompaction(updateBatch);
              } catch (Exception e) {
                  _log.error("failed to consume compaction batch " + updateBatch.getDescriptiveId(), e);
              } finally {
                  _compactor.recycleCompactionBatch(updateBatch);
              }
              return true;
          }
          
          return false;
      }
docs: Consumes a {@link CompactionUpdateBatch} if available.
  
  @return <code>true</code> if a {@link CompactionUpdateBatch} is found and then consumed.
  Otherwise, <code>false</code>.