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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11602) Fix toUpperCase/toLowerCase to use Locale.ENGLISH
Date Fri, 27 Feb 2015 00:31:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14339465#comment-14339465
] 

Akira AJISAKA commented on HADOOP-11602:
----------------------------------------

If {{toUpperCase}}/{{toLowerCase}} method is used only to compare to another string, we can
use {{String.equalsIgnoreCase}} where not downstream of hadoop-common. For example, the below
code
{code:title=StabilityOptions.java}
   public static Integer optionLength(String option) {
     String opt = option.toLowerCase();
     if (opt.equals(UNSTABLE_OPTION)) return 1;
{code}
can be fixed as follows:
{code}
  public static Integer optionlength(String option) {
    if (option.equalsIgnoreCase(UNSTABLE_OPTION)) return 1;
{code}

> Fix toUpperCase/toLowerCase to use Locale.ENGLISH
> -------------------------------------------------
>
>                 Key: HADOOP-11602
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11602
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Tsuyoshi Ozawa
>            Assignee: Tsuyoshi Ozawa
>         Attachments: HADOOP-11602-001.patch, HADOOP-11602-002.patch, HADOOP-11602-003.patch,
HADOOP-11602-branch-2.001.patch, HADOOP-11602-branch-2.002.patch
>
>
> String#toLowerCase()/toUpperCase() without a locale argument can occur unexpected behavior
based on the locale. It's written in [Javadoc|http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#toLowerCase()]:
> {quote}
> For instance, "TITLE".toLowerCase() in a Turkish locale returns "t\u0131tle", where '\u0131'
is the LATIN SMALL LETTER DOTLESS I character
> {quote}
> This issue is derived from HADOOP-10101.



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