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FIX-#4450: Ensure Modin successfully initializes when Ray cluster has no resources #4451

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FIX-#4450: Ensure Modin successfully initializes when Ray cluster has no resources #4451

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2683d06
FIX-#4450: Ensure Modin successfully initializes when Ray cluster has…
RehanSD May 10, 2022
f62f847
Fix formatting, add pr to release notes
RehanSD May 10, 2022
a5437e8
Remove duplicate import warnings
RehanSD May 11, 2022
ad4b868
Address review comments
RehanSD May 27, 2022
17c7c9c
Merge branch 'master' into rehan/scale_from_0
RehanSD May 27, 2022
5035ad3
remove redundant import
RehanSD May 27, 2022
f52b3bb
Merge branch 'rehan/scale_from_0' of https://github.com/RehanSD/modin…
RehanSD May 27, 2022
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4 changes: 3 additions & 1 deletion docs/release_notes/release_notes-0.15.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,8 @@ Key Features and Updates
* FIX-#4461: Fix S3 CSV data path (#4462)
* FIX-#4467: `drop_duplicates` no longer removes items based on index values (#4468)
* FIX-#4449: Drain the call queue before waiting on result in benchmark mode (#4472)
* FIX-#4481: Allow clipping with a Modin Series of bounds (#4486)
* FIX-#4481: Allow clipping with a Modin Series of bounds (#4486)
* FIX-#4450: Ensure Modin successfully initializes when Ray cluster has no resources (#4451)
* Performance enhancements
* FEAT-#4320: Add connectorx as an alternative engine for read_sql (#4346)
* Benchmarking enhancements
Expand Down Expand Up @@ -74,3 +75,4 @@ Contributors
@jrsacher
@orcahmlee
@naren-ponder
@RehanSD
12 changes: 11 additions & 1 deletion modin/core/execution/ray/common/utils.py
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Expand Up @@ -217,7 +217,17 @@ def initialize_ray(
_move_stdlib_ahead_of_site_packages
)
ray.worker.global_worker.run_function_on_all_workers(_import_pandas)
num_cpus = int(ray.cluster_resources()["CPU"])
num_cpus = ray.cluster_resources().get("CPU", None)
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Suggested change
num_cpus = ray.cluster_resources().get("CPU", None)
num_cpus = ray.cluster_resources().get("CPU", None) or 4

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The reason I did it like this is because I wanted to warn users that we were unable to determine how many CPUs there were and were relying on an internal heuristic - should we keep it this way, or change it to the more streamlined version you propose?

if num_cpus is None:
warnings.warn(
"The current Ray cluster does not have any CPU Resources.\nModin uses the number of "
+ "CPUs to determine how many partitions to create.\nNumber of partitions defaulting to"
+ " number of CPUs on head node. To update, run the following python code:\n\tfrom "
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nit: could you instead instantiate num_cpus above this warning, and add the actual value of num_cpus to the warning message? such as, with an f-string.

+ "modin.config import NPartitions\n\tNPartitions.put(desired_num_cpus)"
)
num_cpus = CpuCount.get()
else:
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Suggested change
else:

num_cpus = int(num_cpus)
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Suggested change
num_cpus = int(num_cpus)
num_cpus = int(num_cpus)

num_gpus = int(ray.cluster_resources().get("GPU", 0))
if StorageFormat.get() == "Cudf":
NPartitions._put(num_gpus)
Expand Down