[jira] [Created] (ARROW-14787) read an HDFS file by line failed when the open_mode is "rb"

["nero (Jira)" <ji...@apache.org>]

nero created ARROW-14787:
----------------------------

             Summary: read an HDFS file by line failed when the open_mode is "rb"
                 Key: ARROW-14787
                 URL: https://issues.apache.org/jira/browse/ARROW-14787
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 6.0.0
         Environment: System: Ubuntu 18.04
fsspec: 2021.10.1
pyarrow: 6.0.0
            Reporter: nero


Hi there,

I found some problems when I use `{*}fsspec`{*} to read an HDFS file by line when the open_mode is "rb". It works fine when the *open_mode is "r"* or the {*}file is located locally{*}.

 

some snippets:

```python
import fsspec hdfs_file_path = "hdfs://xxxxxx" with fsspec.open(hdfs_file_path, "rb") as f: # raise UnspportedOperation f.readline()
```

Error logs:
 
```text

{{/opt/conda/lib/python3.7/site-packages/pyarrow/io.pxi in pyarrow.lib.NativeFile.readline()

UnsupportedOperation:}}
```
 



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