def _apply(
self,
fn: Any,
remote_args: dict,
block_list: BlockList,
clear_input_blocks: bool,
name: Optional[str] = None,
) -> BlockList:
"""Note: this is not part of the Dataset public API."""
context = DatasetContext.get_current()
blocks_in = block_list.get_blocks_with_metadata()
# Early release block references.
if clear_input_blocks:
block_list.clear()
orig_num_blocks = len(blocks_in)
results = []
if name is None:
name = "map"
name = name.title()
map_bar = ProgressBar(name, total=orig_num_blocks)
class BlockWorker:
def ready(self):
return "ok"
def map_block_split(self, block: Block,
input_files: List[str]) -> BlockPartition:
return _map_block_split(block, fn, input_files)
@ray.method(num_returns=2)
def map_block_nosplit(
self, block: Block,
input_files: List[str]) -> Tuple[Block, BlockMetadata]:
return _map_block_nosplit(block, fn, input_files)
if not remote_args:
remote_args["num_cpus"] = 1
remote_args["scheduling_strategy"] = context.scheduling_strategy
BlockWorker = ray.remote(**remote_args)(BlockWorker)
workers = [BlockWorker.remote() for _ in range(self.min_size)]
tasks = {w.ready.remote(): w for w in workers}
tasks_in_flight = collections.defaultdict(int)
metadata_mapping = {}
block_indices = {}
ready_workers = set()
while len(results) < orig_num_blocks:
ready, _ = ray.wait(list(tasks.keys()),
timeout=0.01,
num_returns=1,
fetch_local=False)
if not ready:
if (len(workers) < self.max_size
and len(ready_workers) / len(workers) > 0.8):
w = BlockWorker.remote()
workers.append(w)
tasks[w.ready.remote()] = w
map_bar.set_description(
"Map Progress ({} actors {} pending)".format(
len(ready_workers),
len(workers) - len(ready_workers)))
continue
[obj_id] = ready
worker = tasks.pop(obj_id)
# Process task result.
if worker in ready_workers:
results.append(obj_id)
tasks_in_flight[worker] -= 1
map_bar.update(1)
else:
ready_workers.add(worker)
map_bar.set_description(
"Map Progress ({} actors {} pending)".format(
len(ready_workers),
len(workers) - len(ready_workers)))
# Schedule a new task.
while (blocks_in and tasks_in_flight[worker] <
self.max_tasks_in_flight_per_actor):
block, meta = blocks_in.pop()
if context.block_splitting_enabled:
ref = worker.map_block_split.remote(
block, meta.input_files)
else:
ref, meta_ref = worker.map_block_nosplit.remote(
block, meta.input_files)
metadata_mapping[ref] = meta_ref
tasks[ref] = worker
block_indices[ref] = len(blocks_in)
tasks_in_flight[worker] += 1
map_bar.close()
new_blocks, new_metadata = [], []
# Put blocks in input order.
results.sort(key=block_indices.get)
if context.block_splitting_enabled:
for result in ray.get(results):
for block, metadata in result:
new_blocks.append(block)
new_metadata.append(metadata)
else:
for block in results:
new_blocks.append(block)
new_metadata.append(metadata_mapping[block])
new_metadata = ray.get(new_metadata)
return BlockList(new_blocks, new_metadata)
def _apply(
self,
fn: Any,
remote_args: dict,
block_list: BlockList,
clear_input_blocks: bool,
name: Optional[str] = None,
) -> BlockList:
context = DatasetContext.get_current()
# Handle empty datasets.
if block_list.initial_num_blocks() == 0:
return block_list
blocks = block_list.get_blocks_with_metadata()
if name is None:
name = "map"
name = name.title()
map_bar = ProgressBar(name, total=len(blocks))
if context.block_splitting_enabled:
map_block = cached_remote_fn(_map_block_split).options(
**remote_args)
refs = [map_block.remote(b, fn, m.input_files) for b, m in blocks]
else:
map_block = cached_remote_fn(_map_block_nosplit).options(
**dict(remote_args, num_returns=2))
all_refs = [
map_block.remote(b, fn, m.input_files) for b, m in blocks
]
data_refs = [r[0] for r in all_refs]
refs = [r[1] for r in all_refs]
# Release input block references.
if clear_input_blocks:
del blocks
block_list.clear()
# Common wait for non-data refs.
try:
results = map_bar.fetch_until_complete(refs)
except (ray.exceptions.RayTaskError, KeyboardInterrupt) as e:
# One or more mapper tasks failed, or we received a SIGINT signal
# while waiting; either way, we cancel all map tasks.
for ref in refs:
ray.cancel(ref)
# Wait until all tasks have failed or been cancelled.
for ref in refs:
try:
ray.get(ref)
except (ray.exceptions.RayTaskError,
ray.exceptions.TaskCancelledError):
pass
# Reraise the original task failure exception.
raise e from None
new_blocks, new_metadata = [], []
if context.block_splitting_enabled:
for result in results:
for block, metadata in result:
new_blocks.append(block)
new_metadata.append(metadata)
else:
for block, metadata in zip(data_refs, results):
new_blocks.append(block)
new_metadata.append(metadata)
return BlockList(list(new_blocks), list(new_metadata))
def _apply(
self,
block_fn: BlockTransform,
remote_args: dict,
block_list: BlockList,
clear_input_blocks: bool,
name: Optional[str] = None,
fn: Optional[UDF] = None,
fn_args: Optional[Iterable[Any]] = None,
fn_kwargs: Optional[Dict[str, Any]] = None,
fn_constructor_args: Optional[Iterable[Any]] = None,
fn_constructor_kwargs: Optional[Dict[str, Any]] = None,
) -> BlockList:
"""Note: this is not part of the Dataset public API."""
if fn_args is None:
fn_args = tuple()
if fn_kwargs is None:
fn_kwargs = {}
if fn_constructor_args is None:
fn_constructor_args = tuple()
if fn_constructor_kwargs is None:
fn_constructor_kwargs = {}
context = DatasetContext.get_current()
blocks_in = block_list.get_blocks_with_metadata()
# Early release block references.
if clear_input_blocks:
block_list.clear()
orig_num_blocks = len(blocks_in)
results = []
if name is None:
name = "map"
name = name.title()
map_bar = ProgressBar(name, total=orig_num_blocks)
class BlockWorker:
def __init__(
self,
*fn_constructor_args: Any,
**fn_constructor_kwargs: Any,
):
if not isinstance(fn, CallableClass):
if fn_constructor_args or fn_constructor_kwargs:
raise ValueError(
"fn_constructor_{kw}args only valid for CallableClass "
f"UDFs, but got: {fn}"
)
self.fn = fn
else:
self.fn = fn(*fn_constructor_args, **fn_constructor_kwargs)
def ready(self):
return "ok"
def map_block_split(
self,
block: Block,
input_files: List[str],
*fn_args,
**fn_kwargs,
) -> BlockPartition:
return _map_block_split(
block, block_fn, input_files, self.fn, *fn_args, **fn_kwargs
)
@ray.method(num_returns=2)
def map_block_nosplit(
self,
block: Block,
input_files: List[str],
*fn_args,
**fn_kwargs,
) -> Tuple[Block, BlockMetadata]:
return _map_block_nosplit(
block, block_fn, input_files, self.fn, *fn_args, **fn_kwargs
)
if "num_cpus" not in remote_args:
remote_args["num_cpus"] = 1
if "scheduling_strategy" not in remote_args:
ctx = DatasetContext.get_current()
if ctx.scheduling_strategy == DEFAULT_SCHEDULING_STRATEGY:
remote_args["scheduling_strategy"] = "SPREAD"
else:
remote_args["scheduling_strategy"] = ctx.scheduling_strategy
BlockWorker = ray.remote(**remote_args)(BlockWorker)
workers = [
BlockWorker.remote(*fn_constructor_args, **fn_constructor_kwargs)
for _ in range(self.min_size)
]
tasks = {w.ready.remote(): w for w in workers}
tasks_in_flight = collections.defaultdict(int)
metadata_mapping = {}
block_indices = {}
ready_workers = set()
try:
while len(results) < orig_num_blocks:
ready, _ = ray.wait(
list(tasks.keys()), timeout=0.01, num_returns=1, fetch_local=False
)
if not ready:
if (
len(workers) < self.max_size
and len(ready_workers) / len(workers)
> self.ready_to_total_workers_ratio
):
w = BlockWorker.remote(
*fn_constructor_args, **fn_constructor_kwargs
)
workers.append(w)
tasks[w.ready.remote()] = w
map_bar.set_description(
"Map Progress ({} actors {} pending)".format(
len(ready_workers), len(workers) - len(ready_workers)
)
)
continue
[obj_id] = ready
worker = tasks.pop(obj_id)
# Process task result.
if worker in ready_workers:
results.append(obj_id)
tasks_in_flight[worker] -= 1
map_bar.update(1)
else:
ready_workers.add(worker)
map_bar.set_description(
"Map Progress ({} actors {} pending)".format(
len(ready_workers), len(workers) - len(ready_workers)
)
)
# Schedule a new task.
while (
blocks_in
and tasks_in_flight[worker] < self.max_tasks_in_flight_per_actor
):
block, meta = blocks_in.pop()
if context.block_splitting_enabled:
ref = worker.map_block_split.remote(
block,
meta.input_files,
*fn_args,
**fn_kwargs,
)
else:
ref, meta_ref = worker.map_block_nosplit.remote(
block,
meta.input_files,
*fn_args,
**fn_kwargs,
)
metadata_mapping[ref] = meta_ref
tasks[ref] = worker
block_indices[ref] = len(blocks_in)
tasks_in_flight[worker] += 1
map_bar.close()
self.num_workers += len(workers)
new_blocks, new_metadata = [], []
# Put blocks in input order.
results.sort(key=block_indices.get)
if context.block_splitting_enabled:
for result in ray.get(results):
for block, metadata in result:
new_blocks.append(block)
new_metadata.append(metadata)
else:
for block in results:
new_blocks.append(block)
new_metadata.append(metadata_mapping[block])
new_metadata = ray.get(new_metadata)
return BlockList(new_blocks, new_metadata)
except Exception as e:
try:
for worker in workers:
ray.kill(worker)
except Exception as err:
logger.exception(f"Error killing workers: {err}")
finally:
raise e