shardedJobId, readers.size(), writers.size());
ImmutableList.Builder<WorkerShardTask<KeyValue<ByteBuffer, ByteBuffer>,
KeyValue<ByteBuffer, List<ByteBuffer>>, SortContext>> sortTasks =
ImmutableList.builder();
for (int i = 0; i < readers.size(); i++) {
sortTasks.add(new SortShardTask(mrJobId,
i,
readers.size(),
readers.get(i),
new SortWorker(settings.getMaxSortMemory(), settings.getSortBatchPerEmitBytes()),
writers.get(i),