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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1915) adding counters methods using String (as opposed to Enum)
Date Tue, 18 Sep 2007 16:28:43 GMT
adding counters methods using String (as opposed to Enum)
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                 Key: HADOOP-1915
                 URL: https://issues.apache.org/jira/browse/HADOOP-1915
             Project: Hadoop
          Issue Type: New Feature
         Environment: all
            Reporter: Alejandro Abdelnur
            Priority: Minor
             Fix For: 0.15.0


Currently to use the counters from within Map/Reduce code Enums have to be used, the Enum
class defines the group and the Enum itself the counter. Internally they are converted to
Strings (the class name and the enum toString) and you can retrieve them as strings from the
client API.

Using dynamic counters (driven by configuration of the map/reduce) is not easy with the counters
Enum based API. For example, currently I have an Enum class with 50 enums and we have to map
the cardinality to the counter name on the client. This is cumbersome.

This could be easily improve by adding a String based counter method increment(String group,
String counter, long count) to allow use of the counters without Enums.

Internally this method already exists, so the changes are minimal.



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