Re: Manage a ROOT file from a streaming of the ROOT file content

Hi,

Another alternative is to try using the HDFS i/o plugin.

Cheers,
Philippe.

On 4/17/12 10:29 AM, Massimiliano Fasi wrote:
> Hi all,
>
> In order to use Apache Hadoop with MapReduce streaming, we need a c++ way to copy or cast a ROOT file passed through the standard
> input to any type of ROOT object (a TFile hopefully).
>
> Practically, we want to execute a command like
>
>> cat Myfile.root | MyAnalysisCode
>
> or
>
>> MyAnalysisCode < Myfile.root
>
> and then cast in MyAnalysisCode the standard input to something manageable by ROOT.
>
> Solutions we have tried so far didn't work. In particular, we tried to use the ifstream library but we wasn't able to cast their
> objects to something manageable by ROOT.
>
> Any hints or suggestions would be very appreciated.
>
> Thanks,
>
> Massimiliano
>
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Received on Tue Apr 17 2012 - 17:44:34 CEST