Steve Loughran created HADOOP-18854:
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             Summary: add options to disable range merging of vectored io
                 Key: HADOOP-18854
                 URL: https://issues.apache.org/jira/browse/HADOOP-18854
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs, fs/s3
    Affects Versions: 3.3.6, 3.3.5
            Reporter: Steve Loughran


I'm seeing test failures in my PARQUET-2171 pr because assertions about the #of 
bytes read isn't holding -small files are being read and the vector range 
merging is pulling in the whole file.

```
[ERROR]   TestInputOutputFormat.testReadWriteWithCounter:338 bytestotal != 
bytesread expected:<5510> but was:<11020>
```

I think for parquet i will add an option to disable vector io, but really the 
filesystems which support it should allow for merging to be disabled



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