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From "Yufei Gu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14914) Change to a safely casting long to int.
Date Wed, 06 Dec 2017 08:42:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16279846#comment-16279846
] 

Yufei Gu commented on HADOOP-14914:
-----------------------------------

Thanks for the patch. Submit path to kick off the Jenkins.

> Change to a safely casting long to int. 
> ----------------------------------------
>
>                 Key: HADOOP-14914
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14914
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 3.1.0
>            Reporter: Yufei Gu
>            Assignee: Ajay Kumar
>         Attachments: HADOOP-14914.001.patch, HADOOP-14914.002.patch
>
>
> There are bunches of casting long to int like this:
> {code}
> long l = 123
> int i = (int) l;
> {code}
> This is not a safe cast. if l is greater than Integer.MAX_VALUE, i would be negative,
which is an unexpected behavior. We probably at least want to throw an exception in that case.
I suggest to use {{Math.toIntExact(longValue)}} to replace them, which throws an exception
if the value overflows an int. 



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