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https://issues.apache.org/jira/browse/MAHOUT-1284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13721896#comment-13721896
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Maysam Yabandeh commented on MAHOUT-1284:
-----------------------------------------
The error that you get (and I do not manage to reproduce) does seem to be
related to the patch. It complains that #getValue method does not exist, which
is not affected by the patch.
{code}
java.lang.NoSuchMethodError:
org.apache.mahout.common.DummyRecordWriter.getValue(Ljava/lang/Object;)Ljava/util/List;
at
org.apache.mahout.utils.TestConcatenateVectorsJob.testConcatenateVectorsReducer(TestConcatenateVectorsJob.java:90)
{code}
Is there any chance that your test file is not compiled properly. It seems that
your TestConcatenateVectorsJob.class is compiled against the old
DummyRecordWriter.class.
I regenerated the second patch against the latest trunk just to ensure that
there is no behind-the-trunk issue here, and you are right that it still did
not change the patch.
> DummyRecordWriter's bug with reused Writables
> ---------------------------------------------
>
> Key: MAHOUT-1284
> URL: https://issues.apache.org/jira/browse/MAHOUT-1284
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.7, 0.8
> Reporter: Maysam Yabandeh
> Assignee: Suneel Marthi
> Priority: Minor
> Labels: test
> Fix For: 0.9
>
> Attachments: MAHOUT-1284.patch, MAHOUT-1284.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> It is a recommended practice to reuse the Writable objects.
> DummyRecordWriter, which is used for testing in Mahout, however keeps the
> same Writable instance in a map: next time that the user reuses the Writable
> object, the internal map of DummyRecordWriter changes as well. This makes
> DummyRecordWriter fail for testing the MapReduce jobs that reuse the
> Writables.
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