Monday, March 25, 2013

Hadoop: How to get file path of the input record being read in mapper?

There might be situations when you need to know exactly from which file the current <key,value> pair being processed in the mapper has come from.

You might have to process records from a certain bucket/path in a different way from the ones from another location. If you are dealing with online advertisement related hadoop job, then one of the location might have the impressions' logs while the other might have the clicks logs, and you need to process then differently in your mapper.

So, how to go about doing that?

You can get the file path from where the input record currently being processed in the mapper has come from.

First you need to get the input split, using the newer mapreduce API it would be done as follows:

context.getInputSplit();

But in order to get the file path and the file name you will need to first typecast the result into FileSplit.

So, in order to get the input file path you may do the following:

Path filePath = ((FileSplit) context.getInputSplit()).getPath();
String filePathString = ((FileSplit) context.getInputSplit()).getPath().toString();

Similarly, to get the file name, you may just call upon getName(), like this:

String fileName = ((FileSplit) context.getInputSplit()).getPath().getName();

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