-Re: Is the input values for reduce method sorted in any order?
jingguo yao 2013-03-26, 09:45
On Tue, Mar 26, 2013 at 2:28 PM, Harsh J <[EMAIL PROTECTED]> wrote:
> MR will partition and sort inputs by keys by the key comparator, and
> then group them together when reading back via a grouping comparator
> (which is usually the same as the key comparator). It will not re-sort
> the values nor look at any of the value's fields during this process.
> If you want your values to be sorted, implementing secondary sort
> would need to happen wherein you extract the value-sort attributes
> onto your keys and have them grouped differently.
> On Tue, Mar 26, 2013 at 10:55 AM, jingguo yao <[EMAIL PROTECTED]> wrote:
>> Is the Iterable values associated with a key sorted in any order? Are
>> there are any configuration options controlling how the input values are
>> I know that the secondary sort way can be used to achieve the same
>> effect. I am not asking for a workaround.
> Harsh J