LineRecordWriter should not always insert tab char between key and value
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Key: HADOOP-819
URL: http://issues.apache.org/jira/browse/HADOOP-819
Project: Hadoop
Issue Type: Improvement
Reporter: Runping Qi
With the current implementation of LineRecordWriter in TextOutputFormat, the
client cannot pass null key/or value to the write function, and a tab char is
always inserted between the key and value. This works fine most time. However,
in some
cases, one just does not want to have the extra tab char. A common example is
that, if I need to implement a utility similar
to the unix sort with some fields in the lines as the sort key, I can have my
map to extract the sort key from each line and pass the whole line as the
value. The reducer just outputs the values and ignore the keys. However, if I
use TextOutputFormat, my output will have an extra tab key in each of the
lines, which is annoying.
A simple solution is that let the write function of LineRecordWriter accept
null key argument, and write out the value only if the key is null.
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