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https://issues.apache.org/jira/browse/GIRAPH-253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414540#comment-13414540
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Eli Reisman commented on GIRAPH-253:
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What about a PrintfOutputFormat which is specified at the command line like all
the others, using the -of switch, and expecting to pick up a -D option from the
command line whenever it is used that could be specified in GiraphJob with the
other Configuration constants? then you could do
bin/giraph ... -Dgiraph.printf="my vertex id is %ID and value is %VALUE" ...
-of PrintfOutputFormat ...
this way if you get lazy and forget to remove the -D from your command line (or
want to go from testing output to real output and back and forth between runs
quickly) the -D part only gets picked up in the application if you specified
-of as PrintfOutputFormat otherwise is ignored harmlessly.
> Create printf/pretty-printer style output format
> ------------------------------------------------
>
> Key: GIRAPH-253
> URL: https://issues.apache.org/jira/browse/GIRAPH-253
> Project: Giraph
> Issue Type: Bug
> Reporter: Jakob Homan
>
> It would be nice to have an outputformat where the user could specify (from
> the command-line in bin/giraph) the output of each vertex. Something like:
> {noformat}--pretty-print="Hello, my name is %id and my value is %value. I
> have %edges.count edges"{noformat}
> This would result in text files, each line of which would correspond to a
> vertex.
> This would make it very easy for people to spit out different output formats
> without having to actually write any code...
> Bonus points: only print the line if some predicate holds true
> --pretty-print-if="edges.count>10"
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