no doubt
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On Mar 23, 2014, at 17:37, Fengyun RAO raofeng...@gmail.com wrote:
What does this exception mean? I googled a lot, all the results tell me it's
because the time is not synchronized between datanode and namenode.
However, I checked all the servers, that the
yes,my key is ip,and value is a object(which inherited hadoop Record
class,and will be converted
a visualized data),e.g.:
key field1,field2,field3(these are properties belong to
object)
12.121.23.121 121,11,/img/dd.jpg
32.121.23.222 221,11,/img/xx.jpg
1.i want to sort by field1
can anyone get me a tips ?
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thanks all.
to : Josh,i think you are right.i have previously tried to use a group key
by field1+ip at reduce.but it is failed(not sort).
i will check your point:)
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is it running in safemode?hadoop wil run in this case when start for a
moment.
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hi,all:
when i study at chapter 8 of that book,i can't understand some sentences
which i have tried to find it's explanations in javadoc.they are:
a.Reduce-side joins,at page 236,it said:
The reducer knows that it will receive the station record first, so it
extracts its name
from the value and
