[jira] [Commented] (HADOOP-14785) Specify the behavior of handling conflicts between must and opt parameters

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-14785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16674025#comment-16674025 ] 

Steve Loughran commented on HADOOP-14785:
-----------------------------------------

Looking at the code of {{FSDataOutputStreamBuilder}}, if you call opt() on a value after setting must() it gets downgraded to optional, so the order of setting matters.

I'm not so sure about that: I'd take the view that if something is must(k, v) then that should stay as mandatory. But we can keep the ordering of settings sequentials, e,.g

{code}
must("fs:canUnbuffer", true).
opt(("fs:canUnbuffer", false).
{code}

leads to: must("fs:canUnbuffer", false).

Is that good? Or is it confusing?

> Specify the behavior of handling conflicts between must and opt parameters 
> ---------------------------------------------------------------------------
>
>                 Key: HADOOP-14785
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14785
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs
>    Affects Versions: 3.0.0-alpha3
>            Reporter: Lei (Eddy) Xu
>            Priority: Major
>
> It is flexible to allow user to use strings as key/values to specify the behaviors of {{FSOutputStream}}, but this flexibility offers the potential conflicts between parameters.
> It should specify a general rule of how to handle such conflicts for differnt file system implementations.



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