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Posted to common-issues@hadoop.apache.org by "Hiroshi Ikeda (JIRA)" <ji...@apache.org> on 2016/05/12 01:37:13 UTC

[jira] [Commented] (HADOOP-10230) GSetByHashMap breaks contract of GSet

    [ https://issues.apache.org/jira/browse/HADOOP-10230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281093#comment-15281093 ] 

Hiroshi Ikeda commented on HADOOP-10230:
----------------------------------------

GSetByHashMap internally uses HashMap, which supports null elements and doesn't throw NPE from not only {{put}} but {{contains}}, {{get}}, and {{remove}}.

> GSetByHashMap breaks contract of GSet
> -------------------------------------
>
>                 Key: HADOOP-10230
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10230
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Hiroshi Ikeda
>            Assignee: Andres Perez
>            Priority: Trivial
>         Attachments: HADOOP-10230.001.patch
>
>
> The contract of GSet says it is ensured to throw NullPointerException if a given argument is null for many methods, but GSetByHashMap doesn't. I think just writing non-null preconditions for GSet are required.



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