problem reading HDF5 on s3

2022 2 22
2 个回答
回答已采纳
更新时间：2022 11 6
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>> H5F.open('https://dandiarchive.s3.amazonaws.com/blobs/58c/537/58c53789-eec4-4080-ad3b-207cf2a1cac9')
Error using hdf5lib2
Unable to access
'https://dandiarchive.s3.amazonaws.com/blobs/58c/537/58c53789-eec4-4080-ad3b-207cf2a1cac9'.
The specified URL scheme is invalid.
Error in H5F.open (line 130)
file_id = H5ML.hdf5lib2('H5Fopen', filename, flags, fapl, is_remote);
This works when using the same URL with h5py in Python:
from h5py import File
file = File("https://dandiarchive.s3.amazonaws.com/blobs/58c/537/58c53789-eec4-4080-ad3b-207cf2a1cac9", "r", driver="ros3")
file.keys()
<KeysViewHDF5 ['acquisition', 'analysis', 'file_create_date', 'general', 'identifier', 'processing', 'session_description', 'session_start_time', 'specifications', 'stimulus', 'timestamps_reference_time', 'units']>

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 采纳的回答

Ben Dichter
Ben Dichter 2022-11-6
编辑：Ben Dichter 2022-11-6

0 个投票

Two things needed to solve this:
  1. You need to input an s3 path, not an http or https path
  2. Delete or rename ~/.aws/credentials (on Windows something like C:/Users/username/.aws/credentials)

更多回答（1 个）

Yongjian Feng
Yongjian Feng 2022-2-23

0 个投票

In python, you seem to use read_only flag ("r"). Maybe you want to try:
H5F.open('https://dandiarchive.s3.amazonaws.com/blobs/58c/537/58c53789-eec4-4080-ad3b-207cf2a1cac9', 'H5F_ACC_RDONLY')

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Ben Dichter
Ben Dichter 2022-2-23
That does not appear to be the issue. The documentation for H5F indicates that it should be possible to include only the s3 path:
file_id = H5F.open(URL) opens the hdf5 file at a remote location
for read-only access and returns the file identifier, file_id.
Also, this use-case is demonstrated in an example:
Example: Open a file in Amazon S3 in read-only mode with
default file access properties.
fid = H5F.open('s3://bucketname/path_to_file/example.h5');
H5F.close(fid);
I tried some optional arguments, which did not help:
>> H5F.open('https://dandiarchive.s3.amazonaws.com/blobs/58c/537/58c53789-eec4-4080-ad3b-207cf2a1cac9', 'H5F_ACC_RDONLY')
Not enough input arguments.
Error in H5F.open (line 130)
file_id = H5ML.hdf5lib2('H5Fopen', filename, flags, fapl, is_remote);
>> H5F.open('https://dandiarchive.s3.amazonaws.com/blobs/58c/537/58c53789-eec4-4080-ad3b-207cf2a1cac9', 'H5F_ACC_RDONLY', 'H5P_DEFAULT')
Error using hdf5lib2
Unable to access
'https://dandiarchive.s3.amazonaws.com/blobs/58c/537/58c53789-eec4-4080-ad3b-207cf2a1cac9'. The
specified URL scheme is invalid.
Error in H5F.open (line 130)
file_id = H5ML.hdf5lib2('H5Fopen', filename, flags, fapl, is_remote);
It looks like MATLAB is doing validation on the input, ensuring that the path starts with s3://, which mine does not.

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