WritableComparator newKey() fails for NullWritable
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Key: HADOOP-3665
URL: https://issues.apache.org/jira/browse/HADOOP-3665
Project: Hadoop Core
Issue Type: Bug
Components: io
Affects Versions: 0.17.0, 0.16.4, 0.16.3, 0.16.2, 0.16.1, 0.16.0
Environment: n/a
Reporter: Lukas Vlcek
Priority: Minor
Fix For: 0.19.0
It is not possible to use NullWritable as a key in order to suppress key value
in output.
Syndrome exception:
Caused by: java.lang.IllegalAccessException: Class
org.apache.hadoop.io.WritableComparator can not access a member of class
org.apache.hadoop.io.NullWritable with modifiers "private"
The problem is that NullWritable is a singleton and does not provide public
non-parametric constructor. The following code in WritableComparator causes the
exception: return (WritableComparable)keyClass.newInstance();
Proposed simple solution is to use ReflectionUtils instead (it requires
modification as well).
This issue is probably related to HADOOP-2922
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