[jira] [Updated] (HADOOP-18407) Improve vectored IO api spec.

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

     [ https://issues.apache.org/jira/browse/HADOOP-18407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mukund Thakur updated HADOOP-18407:
-----------------------------------
    Summary: Improve vectored IO api spec.   (was: Update vectored IO api spec. )

> 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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