If you don’t want anything get inserted, just set your output to key only or
value only.
TextOutputFormat$LineRecordWriter won’t insert anything unless both values are
set:
public synchronized void write(K key, V value)
throws IOException {
boolean nullKey = key == null || key instanceof NullWritable;
boolean nullValue = value == null || value instanceof NullWritable;
if (nullKey && nullValue) {
return;
}
if (!nullKey) {
writeObject(key);
}
if (!(nullKey || nullValue)) {
out.write(keyValueSeparator);
}
if (!nullValue) {
writeObject(value);
}
out.write(newline);
}
On Sep 10, 2014, at 1:37 PM, Dmitry Sivachenko <trtrmi...@gmail.com> wrote:
>
> On 10 сент. 2014 г., at 22:33, Felix Chern <idry...@gmail.com> wrote:
>
>> Use ‘tr -s’ to stripe out tabs?
>>
>> $ echo -e "a\t\t\tb"
>> a b
>>
>> $ echo -e "a\t\t\tb" | tr -s "\t"
>> a b
>>
>
> There can be tabs in the input, I want to keep input lines without any
> modification.
>
> Actually it is rather standard task: process lines one by one without
> inserting extra characters. There should be standard solution for it IMO.
>
