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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