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https://issues.apache.org/jira/browse/HADOOP-18407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17581545#comment-17581545
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ASF GitHub Bot commented on HADOOP-18407:
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mukund-thakur opened a new pull request, #4760:
URL: https://github.com/apache/hadoop/pull/4760
part of HADOOP-18103.
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### Description of PR
### How was this patch tested?
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> Improve vectored IO api spec.
> ------------------------------
>
> Key: HADOOP-18407
> URL: https://issues.apache.org/jira/browse/HADOOP-18407
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs, fs/s3
> Reporter: Mukund Thakur
> Priority: Minor
>
> Let's add more details to the vectored IO api spec for better clarity.
> * the position returned by getPos(); is undefined afterwards.
> * note that if a file is changed during a read, the output is again
> undefined. some ranges may be old data, some may be new, *and some may be both
> * note that while reads are active, normal fs api calls may block.
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