Hi guys,

I have been wondering if there's a way (hack'ish would be okay too) to tell
Hadoop that two files shall be stored together at the same location(s). It
would benefit map-side join performance if it could be done somehow because
all map tasks would be able to read data from a local copy. Does anyone
know a way?

-Sigurd

You are probably talking of
https://issues.apache.org/jira/browse/HDFS-2576 and similar JIRAs.
This feature isn't available in HDFS yet, but may arrive soon.

On Wed, Dec 5, 2012 at 11:23 PM, Sigurd Spieckermann
<[EMAIL PROTECTED]> wrote:
> Hi guys,
>
> I have been wondering if there's a way (hack'ish would be okay too) to tell
> Hadoop that two files shall be stored together at the same location(s). It
> would benefit map-side join performance if it could be done somehow because
> all map tasks would be able to read data from a local copy. Does anyone know
> a way?
>
> -Sigurd

--
Harsh J

Awesome! That's exactly what I'm looking for. Hadn't seen the JIRA. I
hope this is coming soon!

Am 05.12.2012 18:58, schrieb Harsh J:
> You are probably talking of
> https://issues.apache.org/jira/browse/HDFS-2576 and similar JIRAs.
> This feature isn't available in HDFS yet, but may arrive soon.
>
> On Wed, Dec 5, 2012 at 11:23 PM, Sigurd Spieckermann
> <[EMAIL PROTECTED]> wrote:
>> Hi guys,
>>
>> I have been wondering if there's a way (hack'ish would be okay too) to tell
>> Hadoop that two files shall be stored together at the same location(s). It
>> would benefit map-side join performance if it could be done somehow because
>> all map tasks would be able to read data from a local copy. Does anyone know
>> a way?
>>
>> -Sigurd
>
>
>

MapR does this already .. and well beyond just 2 files.  One can arrange
things so that a boatload of files have all their replicas also placed on
the same set of nodes, ie,  files A ... Z will have replica1 on node1,
replica2 on node2, replica3 on node3. etc.  (nodes 1. 2 and 3 are picked by
the system based on utilization and node-fullness).
On Wed, Dec 5, 2012 at 11:26 AM, Sigurd Spieckermann <
[EMAIL PROTECTED]> wrote:

> Awesome! That's exactly what I'm looking for. Hadn't seen the JIRA. I hope
> this is coming soon!
>
> Am 05.12.2012 18:58, schrieb Harsh J:
>
>  You are probably talking of
>> https://issues.apache.org/**jira/browse/HDFS-2576<https://issues.apache.org/jira/browse/HDFS-2576>and similar JIRAs.
>> This feature isn't available in HDFS yet, but may arrive soon.
>>
>> On Wed, Dec 5, 2012 at 11:23 PM, Sigurd Spieckermann
>> <[EMAIL PROTECTED]**> wrote:
>>
>>> Hi guys,
>>>
>>> I have been wondering if there's a way (hack'ish would be okay too) to
>>> tell
>>> Hadoop that two files shall be stored together at the same location(s).
>>> It
>>> would benefit map-side join performance if it could be done somehow
>>> because
>>> all map tasks would be able to read data from a local copy. Does anyone
>>> know
>>> a way?
>>>
>>> -Sigurd
>>>
>>
>>
>>
>>