-Re: InputFormat for some REST api
Mohammad Tariq 2013-02-19, 17:39
Good points sir. Specially the second one. How the splits will get
On Tue, Feb 19, 2013 at 11:04 PM, Robert Evans <[EMAIL PROTECTED]> wrote:
> I don't know of any input format that will do this out of the box. But it
> should not be that hard to write one. There are two big issues here.
> 1. the data you are reading form the API really needs to be static, or
> you could get some very odd inconsistencies. For example a node dies after
> a map task has finished and not all of the reducers got the data, so the
> map task is rerun and some of the reducers have some old data, and some of
> the reducers have new data. This is the main reason to download the data
> before processing it. You can work around this by using the input format
> to run a map only job that then writes the data out to a file before
> processing it the rest of the way.
> 2. You need a good way to partition the data from the API. This can
> be difficult unless the REST API provides a logical way to split this up.
> From: Yaron Gonen <[EMAIL PROTECTED]>
> Reply-To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
> Date: Tuesday, February 19, 2013 4:49 AM
> To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
> Subject: InputFormat for some REST api
> Do you know of any InputFormat implemented for some REST api provider?
> Usually when one needs to process data that is accessible only by REST,
> one should try to download the data first someone, but what if you cannot
> download it?