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Deadlock when reading GeoParquet dataset with multiple files #608
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Ah 😬. I wonder if it's reproducible when run against a pair, and a pair of significantly smaller/truncated files. This worked before the object store change, right? Thinking about it, this dataset is big enough that any leaks in get_opts could cause something similar to this (the channels used to smuggle the non-sens stream might be the culprit). |
Sorry for the confusion, this didn't work before the object store change. I haven't tried it again with the object store merged in as well. But presumably this is an issue in my code with how I'm running the futures |
I'm trying to play around with |
Pasting some references for myself: |
Alright, I've done a bit of digging, and it ended up being the handling of zero-length wkb geometries - using the same bbox for anything other than part-0026 results in zero rows, which in debug triggered panics in parse_geometry_to_native. With a workaround in src/io/parquet/reader/async's |
The ParquetDataset structs will definitely benefit from a |
That is amazing! Thank you so much for debugging this! |
I think this will also improve when I re-enable geoarrow-rs/src/io/parquet/reader/options.rs Lines 67 to 68 in cae8800
This was implemented here: geoarrow-rs/src/io/parquet/reader/spatial_filter.rs Lines 198 to 225 in cae8800
But the issue is that the order of the columns in that struct is the same as the original data, not in our query. So for example, the overture data is laid out as But for something like the overture data, where attributes are quite large in comparison to the bbox columns, this should significantly improve perf and memory use, because attributes won't even be decoded from Parquet for pages that are excluded from the bounding box query. E.g. I was just testing with overture buildings data with a small bounding box over Boston and received a 900k row dataset, where the first 100k rows are nowhere near Boston: I imagine that a small number of data pages actually intersect the query of interest. |
@H-Plus-Time it turns out that what I thought was a deadlock was actually a horrible Deno bug: denoland/deno#23385 |
Yeah, I feel like it's jupyter kernel specific too, the moment I switched from deno run to using jupyter, and accidentally triggered a panic (e.g. url that pointed nowhere) - hanging forever. |
I got the same behavior outside of Jupyter, but it had to be async |
NB: based on the #609 branch, and duplicates the zero-row handling in the read_stream inner closure for ParquetFile (any alterations during review, I'll reflect them here too). From testing, there's definitely serial behaviour going on, I suspect a buffer stream combinator at some level is warranted (unsure which, maybe at row groups?). For the bbox/overture maps dataset discussed in #608 , total execution time increased from 15s to 19s (reliably).
Closes #593. Ref #608 (comment) 🚀 ![image](https://github.com/geoarrow/geoarrow-rs/assets/15164633/5f16b059-4018-4400-9b45-8f5e0b79e80c) ```py import json import pyarrow as pa from lonboard import PolygonLayer, Map from geoarrow.rust.core import ParquetDataset, ObjectStore, ParquetFile import geoarrow.pyarrow geoarrow.pyarrow.register_extension_types() url = "s3://overturemaps-us-west-2" options = { "aws_access_key_id": "redacted", "aws_secret_access_key": "redacted", "aws_region": "us-west-2", } store = ObjectStore(url, options) with open('urls.json') as f: paths = json.load(f) requested_bounds = [-71.125849,42.323234,-71.006592,42.40025] %time dataset = ParquetDataset(paths, fs=store) bbox_paths = { "minx_path": ['bbox', 'minx'], "miny_path": ["bbox", "miny"], "maxx_path": ["bbox", "maxx"], "maxy_path": ["bbox", "maxy"], } test_dataset = await dataset.read_async(bbox=requested_bounds, bbox_paths=bbox_paths) pa_table = pa.table(test_dataset) layer = PolygonLayer(table=pa_table.select(['geometry']).slice(0, 100_000)) m = Map(layer) m ``` where `urls.json` is the following, the urls from `aws s3 ls s3://overturemaps-us-west-2/release/2024-03-12-alpha.0/theme=buildings/type=building/`: <details> ```json [ "release/2024-03-12-alpha.0/theme=buildings/type=building/part-00000-4dfc75cd-2680-4d52-b5e0-f4cc9f36b267-c000.zstd.parquet", "release/2024-03-12-alpha.0/theme=buildings/type=building/part-00001-4dfc75cd-2680-4d52-b5e0-f4cc9f36b267-c000.zstd.parquet", "release/2024-03-12-alpha.0/theme=buildings/type=building/part-00002-4dfc75cd-2680-4d52-b5e0-f4cc9f36b267-c000.zstd.parquet", "release/2024-03-12-alpha.0/theme=buildings/type=building/part-00003-4dfc75cd-2680-4d52-b5e0-f4cc9f36b267-c000.zstd.parquet", "release/2024-03-12-alpha.0/theme=buildings/type=building/part-00004-4dfc75cd-2680-4d52-b5e0-f4cc9f36b267-c000.zstd.parquet", 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"release/2024-03-12-alpha.0/theme=buildings/type=building/part-00229-4dfc75cd-2680-4d52-b5e0-f4cc9f36b267-c000.zstd.parquet", "release/2024-03-12-alpha.0/theme=buildings/type=building/part-00230-4dfc75cd-2680-4d52-b5e0-f4cc9f36b267-c000.zstd.parquet", "release/2024-03-12-alpha.0/theme=buildings/type=building/part-00231-4dfc75cd-2680-4d52-b5e0-f4cc9f36b267-c000.zstd.parquet" ] ``` </details> Testing this in Python it still hangs 😭 . Edit: Looks like it's something with the tokio integration? It _works_ when using the async API from Python
@H-Plus-Time in case you have any interest in reading multi-file GeoParquet datasets, I'd love if you were able to check over my work, because I seem to have a deadlock somewhere.
For example, testing on this branch this works (in Deno)
but then this addition:
seems to deadlock:
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