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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8614) IOUtils#skipFully hangs forever on EOF
Date Mon, 23 Jul 2012 18:50:34 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8614?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HADOOP-8614:
-----------------------------------------

    Status: Patch Available  (was: Open)
    
> 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: 2.0.1-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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