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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5530) Binary and source incompatibility in mapred.lib.CombineFileInputFormat between branch-1 and branch-2
Date Tue, 24 Sep 2013 00:43:03 GMT
Robert Kanter created MAPREDUCE-5530:
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             Summary: Binary and source incompatibility in mapred.lib.CombineFileInputFormat
between branch-1 and branch-2
                 Key: MAPREDUCE-5530
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5530
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv1, mrv2
    Affects Versions: 2.1.1-beta
            Reporter: Robert Kanter
            Assignee: Robert Kanter
            Priority: Blocker


{{mapred.lib.CombineFileInputFormat}} in branch-1 has this method:
{code:java}
protected boolean isSplitable(FileSystem fs, Path file)
{code}

In branch-2, {{mapred.lib.CombineFileInputFormat}} is now a subclass of {{mapreduce.lib.input.CombineFileInputFormat}},
from which it inherits the similar method:
{code:java}
protected boolean isSplitable(JobContext context, Path file)
{code}

This means that any code that subclasses {{mapred.lib.CombineFileInputFormat}} and does not
provide its own implementation of {{protected boolean isSplitable(FileSystem fs, Path file)}}
will not be binary or source compatible if it tries to call {{isSplitable}} with a {{FileSystem}}
argument anywhere (that is, if compiled against branch-1, it will throw a {{NoSuchMethodError}}
if run against branch-2; also, it won't even compile against branch-2).  

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