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From dealmaker <vin...@gmail.com>
Subject Re: Do I need to implement Readfields and Write Functions If I have Only One Field?
Date Wed, 03 Jun 2009 23:11:43 GMT

I have the following as my type of my "value" object.  Do I need to implement
readfields and write functions?

  private static class StringArrayWritable extends ArrayWritable { 
    private StringArrayWritable (String [] aSString) { 
      super (aSString); 
    } 
  } 


Aaron Kimball-3 wrote:
> 
> If you can use an existing serializeable type to hold that field (e.g., if
> it's an integer, then use IntWritable) then you can just get away with
> that.
> If you are specifying your own class for a key or value class, then yes,
> the
> class must implement readFields() and write().
> 
> There's no concept of introspection or other "magic" to determine how to
> serialize types by decomposing them into more primitive types - you must
> manually insert the logic for this in every class you use.
> 
> - Aaron
> 
> On Wed, Jun 3, 2009 at 2:41 PM, dealmaker <vinkhc@gmail.com> wrote:
> 
>>
>> Hi,
>>  I have only one field for the record.  I wonder if I even need to define
>> a
>> member variable in class Record.  Do I even need to implement readfields
>> and
>> write functions if I have only one field?  Can I just use the "value"
>> object
>> directly instead of a member variable of value object?
>> Thanks.
>> --
>> View this message in context:
>> http://www.nabble.com/Do-I-need-to-implement-Readfields-and-Write-Functions-If-I-have-Only-One-Field--tp23860009p23860009.html
>> Sent from the Hadoop core-user mailing list archive at Nabble.com.
>>
>>
> 
> 

-- 
View this message in context: http://www.nabble.com/Do-I-need-to-implement-Readfields-and-Write-Functions-If-I-have-Only-One-Field--tp23860009p23861181.html
Sent from the Hadoop core-user mailing list archive at Nabble.com.


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