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https://issues.apache.org/jira/browse/HADOOP-1915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12528573
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Owen O'Malley commented on HADOOP-1915:
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Actually, this is necessary for pipes too. I think the enum interface is better
in general, but there are a couple of use cases where strings are just easier
to deal with.
> adding counters methods using String (as opposed to Enum)
> ---------------------------------------------------------
>
> 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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