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

Hi,

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

Is there HDFS i/o plugin in ROOT? with which it is possible to write directly (not through Fuse) from ROOT to HDFS. If it is the case please point us to the documentation.

cheers
Hassen

>
> 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 Wed Apr 18 2012 - 09:44:53 CEST