ListKeys or MapReduce

Christian Dahlqvist christian at
Thu Feb 14 03:01:11 EST 2013

Hi Jeremiah,

It does indeed not seem to be documented on the main docs site, and I will try to correct this. The only place I have found it described is on the wiki for the Ruby client (
Below is also an example of a simple mapreduce job that shows how to count the number of records in the 'goog' bucket based on the $bucket secondary index:

curl -XPOST http://localhost:8098/mapred 
  -H 'Content-Type: application/json' 
  -d '{"inputs":{

I hope this helps.

Best regards,


On 13 Feb 2013, at 18:12, Jeremiah Peschka <jeremiah.peschka at> wrote:

> Is this documented anywhere on the site? 
> Searching for $bucket produces search results just for "bucket" and Google says "No results found for $bucket."
> ---
> Jeremiah Peschka - Founder, Brent Ozar Unlimited
> MCITP: SQL Server 2008, MVP
> Cloudera Certified Developer for Apache Hadoop
> On Wed, Feb 13, 2013 at 10:08 AM, Christian Dahlqvist <christian at> wrote:
> Hi,
> In addition to the $key index, there is also a $bucket index available by default. This contains the name of the bucket, and can be used to get all keys in a specific bucket.
> Best regards,
> Christian

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