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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 Thu, 13 Mar 2008 13:03:47 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.patch

I've created a patch for this. The main change is the removal of ordinal values for storing
Counters in a Group. To do this I've replaced the sparse list of Counters (where the index
is the ordinal) by a map of Counter name to Counter. I've also changed the Writable format
of a Counter to send the non-localized name (rather than the localized name). Localization
is done after deserialization.

In terms of public API changes I have added the following method to Reporter:

{code}
public abstract void incrCounter(String group, String counter, long amount);
{code}

and the corresponding method to Counters. Methods in Counters that take an ordinal have been
deprecated.

> 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: Christopher Zimmerman
>            Priority: Minor
>         Attachments: 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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