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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