Github user jinmeiliao commented on a diff in the pull request:

    https://github.com/apache/geode/pull/753#discussion_r136638047
  
    --- Diff: 
geode-core/src/main/java/org/apache/geode/management/internal/cli/commands/ExportDataCommand.java
 ---
    @@ -41,44 +44,34 @@ public Result exportData(
           @CliOption(key = CliStrings.EXPORT_DATA__REGION, mandatory = true,
               optionContext = ConverterHint.REGION_PATH,
               help = CliStrings.EXPORT_DATA__REGION__HELP) String regionName,
    -      @CliOption(key = CliStrings.EXPORT_DATA__FILE, mandatory = true,
    +      @CliOption(key = CliStrings.EXPORT_DATA__FILE,
               help = CliStrings.EXPORT_DATA__FILE__HELP) String filePath,
    +      @CliOption(key = CliStrings.EXPORT_DATA__DIR,
    +          help = CliStrings.EXPORT_DATA__DIR__HELP) String dirPath,
           @CliOption(key = CliStrings.MEMBER, optionContext = 
ConverterHint.MEMBERIDNAME,
    -          mandatory = true, help = CliStrings.EXPORT_DATA__MEMBER__HELP) 
String memberNameOrId) {
    +          mandatory = true, help = CliStrings.EXPORT_DATA__MEMBER__HELP) 
String memberNameOrId,
    +      @CliOption(key = CliStrings.EXPORT_DATA__PARALLEL, 
unspecifiedDefaultValue = "false",
    --- End diff --
    
    also, since there is a unspecified default value (false), is it really 
necessary to make it a mandatory option if "dir" is specified? can we just make 
it default to false(or true, whatever sensible) if user didn't add --parallel, 
but specified --dir?


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