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https://issues.apache.org/jira/browse/HADOOP-18854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17825659#comment-17825659
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Steve Loughran commented on HADOOP-18854:
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thanks. will close as done.
> 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: Sub-task
> Components: fs, fs/s3
> Affects Versions: 3.3.5, 3.3.6
> Reporter: Steve Loughran
> Priority: Major
>
> 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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