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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14914) Change to a safely casting long to int.
Date Wed, 13 Dec 2017 22:56:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290062#comment-16290062

Chen Liang commented on HADOOP-14914:

Thanks [~yufeigu] for reporting this and [~ajayydv] for working on it. v002 patch LGTM, I
ran the failed tests locally, {{TestContainerLaunch}} failed even without the patch, the others
all passed.  I will commit it shortly. 

> 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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