[jira] [Commented] (HADOOP-8614) IOUtils#skipFully hangs forever on EOF

["Eli Collins (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-8614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13438210#comment-13438210 ] 

Eli Collins commented on HADOOP-8614:
-------------------------------------

+1 looks good, test failure is unrelated.
                
> IOUtils#skipFully hangs forever on EOF
> --------------------------------------
>
>                 Key: HADOOP-8614
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8614
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HADOOP-8614.001.patch
>
>
> IOUtils#skipFully contains this code:
> {code}
>   public static void skipFully(InputStream in, long len) throws IOException {
>     while (len > 0) {
>       long ret = in.skip(len);
>       if (ret < 0) {
>         throw new IOException( "Premature EOF from inputStream");
>       }
>       len -= ret;
>     }
>   }
> {code}
> The Java documentation is silent about what exactly skip is supposed to do in the event of EOF.  However, I looked at both InputStream#skip and ByteArrayInputStream#skip, and they both simply return 0 on EOF (no exception).  So it seems safe to assume that this is the standard Java way of doing things in an InputStream.
> Currently IOUtils#skipFully will loop forever if you ask it to skip past EOF!

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