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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1915) adding counters methods using String (as opposed to Enum)
Date Mon, 24 Mar 2008 14:53:24 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1915?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom White updated HADOOP-1915:
------------------------------

    Attachment: hadoop-1915-v2.patch

Minor change to patch so it applies cleanly to trunk.

> adding counters methods using String (as opposed to Enum)
> ---------------------------------------------------------
>
>                 Key: HADOOP-1915
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1915
>             Project: Hadoop Core
>          Issue Type: New Feature
>         Environment: all
>            Reporter: Alejandro Abdelnur
>            Assignee: Tom White
>            Priority: Minor
>             Fix For: 0.17.0
>
>         Attachments: hadoop-1915-v2.patch, hadoop-1915.patch
>
>
> 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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