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https://issues.apache.org/jira/browse/MRUNIT-70?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13226044#comment-13226044
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Goir Riog commented on MRUNIT-70:
---------------------------------
We're using Hadoop with Cassandra.
This requires to use ByteBuffer objects for the key as return values from the
Reducer. The ByteBuffer doesnt have a empty Constructor so we get the following
exception.
java.lang.RuntimeException: java.lang.NoSuchMethodException:
java.nio.HeapByteBuffer.<init>()
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:115)
at
org.apache.hadoop.mrunit.mock.MockOutputCollector.getInstance(MockOutputCollector.java:62)
at
org.apache.hadoop.mrunit.mock.MockOutputCollector.deepCopy(MockOutputCollector.java:73)
at
org.apache.hadoop.mrunit.mock.MockOutputCollector.collect(MockOutputCollector.java:110)
at
org.apache.hadoop.mrunit.mapreduce.mock.MockReduceContextWrapper$MockReduceContext.write(MockReduceContextWrapper.java:204)
[...]
is there any patch yet ?
> copy(orig, conf) in Serialization shouldn't require objects to have a no-args
> constructor, and copy(orig, copy, conf) seems to violate contract for
> deserializer.deserialize()
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MRUNIT-70
> URL: https://issues.apache.org/jira/browse/MRUNIT-70
> Project: MRUnit
> Issue Type: Bug
> Affects Versions: 0.8.0
> Reporter: Meloss Xeloss
> Priority: Minor
>
> The copy(orig, conf) method requires objects to have a no-args constructor,
> which is non-ideal, since it passes on to Deserializer.deserialize, which can
> create a new object if passed in null. Additionally, the contract for
> deserialize only _can_ fill in the object passed in, so the copy method will
> not perform as expected if it does not.
> http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/io/serializer/Deserializer.html#deserialize%28T%29
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