TupleWritable can return incorrect results if it contains more than 32 values
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Key: HADOOP-5571
URL: https://issues.apache.org/jira/browse/HADOOP-5571
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Affects Versions: 0.19.1
Reporter: Jingkei Ly
When attempting to do an outer join on 45 files with the CompositeInputFormat,
I've been encountering unexpected results in the TupleWritable returned by the
record reader. On closer inspection, it seems to be because
TupleWritable.setWritten(int) is incorrectly setting some tuple positions as
written, i.e when you set setWritten(42), it also sets position 10.
The following Junit test demonstrates the problem:
{code}
public void testWideTuple() throws Exception {
Text emptyText = new Text("Should be empty");
Writable[] values = new Writable[64];
Arrays.fill(values,emptyText);
values[42] = new Text("Number 42");
TupleWritable tuple = new TupleWritable(values);
tuple.setWritten(42);
for (int pos=0; pos<tuple.size();pos++) {
boolean has = tuple.has(pos);
if (pos == 42) {
assertTrue(has);
}
else {
assertFalse("Tuple position is incorrectly labelled as set: " + pos,
has);
}
}
}
{code}
Similarly, TupleWritable.setWritten(9) also causes TupleWritable.has(41) to
incorrectly return true.
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