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https://issues.apache.org/jira/browse/HIVE-14374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15400101#comment-15400101
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Peter Vary commented on HIVE-14374:
-----------------------------------
[~stakiar] Currently only a handful of parameters are documented as a command
line option, but almost twice as many could be set from the configuration file.
I don't know how much of it is by design, and how much of this is by error. I
hope someone with more experience in Hive could help here.
+1 for the commons-cli solution and then we could forget every annotation
magic. I wasn't brave enough to suggest it, although it is already used in
beeline compatibility mode.
> BeeLine argument, and configuration handling cleanup
> ----------------------------------------------------
>
> Key: HIVE-14374
> URL: https://issues.apache.org/jira/browse/HIVE-14374
> Project: Hive
> Issue Type: Improvement
> Components: Beeline
> Affects Versions: 2.2.0
> Reporter: Peter Vary
> Assignee: Peter Vary
>
> BeeLine uses reflection, to set the BeeLineOpts attributes when parsing
> command line arguments, and when loading the configuration file.
> This means, that creating a setXXX, getXXX method in BeeLineOpts is a
> potential risk of exposing an attribute for the user unintentionally. There
> is a possibility to exclude an attribute from saving the value in the
> configuration file with the Ignore annotation. This does not restrict the
> loading or command line setting of these parameters which means there are
> many undocumented "features" as-is, like setting the lastConnectedUrl,
> allowMultilineCommand, maxHeight, trimScripts, etc. from command line.
> This part of the code needs a little cleanup.
> I think we should make this exposure more explicit, and be able to
> differentiate the configurable options depending on the source (command line,
> and configuration file), so I propose to create a mechanism to tell
> explicitly which BeeLineOpts attributes are settable by command line, and
> configuration file, and every other attribute should be inaccessible by the
> user of the beeline cli.
> One possible solution could be two annotations like these:
> - CommandLineOption - there could be a mandatory text parameter here, so the
> developer had to provide the help text for it which could be displayed to the
> user
> - ConfigurationFileOption - no text is required here
> Something like this:
> - This attribute could be provided by command line, and from a configuration
> file too:
> {noformat}
> @CommandLineOption("automatically save preferences")
> @ConfigurationFileOption
> public void setAutosave(boolean autosave) {
> this.autosave = autosave;
> }
> public void getAutosave() {
> return this.autosave;
> }
> {noformat}
> - This attribute could be set through the configuration only
> {noformat}
> @ConfigurationFileOption
> public void setLastConnectedUrl(String lastConnectedUrl) {
> this.lastConnectedUrl = lastConnectedUrl;
> }
>
> public String getLastConnectedUrl()
> {
> return lastConnectedUrl;
>
}
>
{noformat}
> - Attribute could be set through command line only - I think this is not too
> relevant, but possible
> {noformat}
> @CommandLineOption("specific command line option")
> public void setSpecificCommandLineOption(String specificCommandLineOption) {
>
this.specificCommandLineOption = specificCommandLineOption;
>
}
>
> public String getSpecificCommandLineOption() {
>
return specificCommandLineOption;
>
}
>
{noformat}
> - Attribute could not be set
> {noformat}
> public static Env getEnv() {
>
return env;
>
}
>
public static void setEnv(Env envToUse) {
>
env = envToUse;
>
}
> {noformat}
> Accouring to our previous conversations, I think you might be interested in:
> [~spena], [~vihangk1], [~aihuaxu], [~ngangam], [~ychena], [~xuefuz]
> but anyone is welcome to discuss this.
> What do you think about the proposed solution?
> Any better ideas, or extensions?
> Thanks,
> Peter
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