You are viewing a plain text version of this content. The canonical link for it is here.

Posted to common-user@hadoop.apache.org by Vijay Bharath Reddy <vi...@gmail.com> on 2009/09/17 20:17:02 UTC

reg : my OutputFormat class cannot recognize my WritableComparable class

Hi,

I'm writing my own OutputFormat class and I faced the folloeing errors.

-- public class KeyDoc implements WritableComparable{

this is my WritableComparable implementation...

-- public class KeyDocOutputFormat<KeyDoc,IntWritable> implements
OutputFormat<KeyDoc,IntWritable>{

this is my OutputFormat implementation...

      In this KeyDocOutputFormat class I implemented RecordWriter ..

              --  public static class MyRecordWriter<KeyDoc, IntWritable>
implements RecordWriter<KeyDoc, IntWritable>{

                     In this RecordWriter  my write function goes like
this...

                          --  public synchronized void write(KeyDoc kd,
IntWritable v) throws IOException{


And in this function when I'm accessing the KeyDoc attributes compiler is
shooting the following error..


KeyDocOutputFormat.java:55: cannot find symbol
symbol  : method get(java.lang.String)
location: class java.lang.Object
                out.write(kd.get("docTitle"));

Its considering the kd as an Object not as an KeyDoc... So for checking this
I gave.....

if(kd instanceof KeyDoc)
       out.write(kd.get("word"));

then the error is ....

KeyDocOutputFormat.java:50: unexpected type
found   : KeyDoc
required: class or array
                if(kd instanceof KeyDoc)

Can someone help me in debugging it .....

--
vJay

PS :: I attached the source code..

Re: reg : my OutputFormat class cannot recognize my WritableComparable class

Posted by Vijay Bharath Reddy <vi...@gmail.com>.

thanks for the reply.

I sorted it out by replacing all *<KeyDoc, IntWritable>* with *<K, V>* ...

vJay.

On Fri, Sep 18, 2009 at 1:08 AM, Jeyendran Balakrishnan <
jbalakrishnan@docomolabs-usa.com> wrote:

> Try replacing your class definitions to:
>
> public class KeyDocOutputFormat implements
> OutputFormat<KeyDoc,IntWritable>{
> and
>
> public static class MyRecordWriter implements RecordWriter<KeyDoc,
> IntWritable>{
>
>
>
> ________________________________
>
> From: Vijay Bharath Reddy [mailto:vijaybharathenator@gmail.com]
> Sent: Thursday, September 17, 2009 11:17 AM
> To: common-user@hadoop.apache.org
> Subject: reg : my OutputFormat class cannot recognize my
> WritableComparable class
>
>
>
>
> Hi,
>
> I'm writing my own OutputFormat class and I faced the folloeing errors.
>
> -- public class KeyDoc implements WritableComparable{
>
> this is my WritableComparable implementation...
>
> -- public class KeyDocOutputFormat<KeyDoc,IntWritable> implements
> OutputFormat<KeyDoc,IntWritable>{
>
> this is my OutputFormat implementation...
>
>      In this KeyDocOutputFormat class I implemented RecordWriter ..
>
>              --  public static class MyRecordWriter<KeyDoc,
> IntWritable> implements RecordWriter<KeyDoc, IntWritable>{
>
>                     In this RecordWriter  my write function goes like
> this...
>
>                          --  public synchronized void write(KeyDoc kd,
> IntWritable v) throws IOException{
>
>
> And in this function when I'm accessing the KeyDoc attributes compiler
> is shooting the following error..
>
>
> KeyDocOutputFormat.java:55: cannot find symbol
> symbol  : method get(java.lang.String)
> location: class java.lang.Object
>                out.write(kd.get("docTitle"));
>
> Its considering the kd as an Object not as an KeyDoc... So for checking
> this I gave.....
>
> if(kd instanceof KeyDoc)
>       out.write(kd.get("word"));
>
> then the error is ....
>
> KeyDocOutputFormat.java:50: unexpected type
> found   : KeyDoc
> required: class or array
>                if(kd instanceof KeyDoc)
>
> Can someone help me in debugging it .....
>
> --
> vJay
>
> PS :: I attached the source code..
>
>
>
>


-- 
vJay

RE: reg : my OutputFormat class cannot recognize my WritableComparable class

Posted by Jeyendran Balakrishnan <jb...@docomolabs-usa.com>.

Try replacing your class definitions to:

public class KeyDocOutputFormat implements
OutputFormat<KeyDoc,IntWritable>{
and

public static class MyRecordWriter implements RecordWriter<KeyDoc,
IntWritable>{

 

________________________________

From: Vijay Bharath Reddy [mailto:vijaybharathenator@gmail.com] 
Sent: Thursday, September 17, 2009 11:17 AM
To: common-user@hadoop.apache.org
Subject: reg : my OutputFormat class cannot recognize my
WritableComparable class

 


Hi,

I'm writing my own OutputFormat class and I faced the folloeing errors. 

-- public class KeyDoc implements WritableComparable{

this is my WritableComparable implementation...

-- public class KeyDocOutputFormat<KeyDoc,IntWritable> implements
OutputFormat<KeyDoc,IntWritable>{

this is my OutputFormat implementation... 
 
      In this KeyDocOutputFormat class I implemented RecordWriter ..

              --  public static class MyRecordWriter<KeyDoc,
IntWritable> implements RecordWriter<KeyDoc, IntWritable>{

                     In this RecordWriter  my write function goes like
this...

                          --  public synchronized void write(KeyDoc kd,
IntWritable v) throws IOException{


And in this function when I'm accessing the KeyDoc attributes compiler
is shooting the following error..


KeyDocOutputFormat.java:55: cannot find symbol
symbol  : method get(java.lang.String)
location: class java.lang.Object
                out.write(kd.get("docTitle"));

Its considering the kd as an Object not as an KeyDoc... So for checking
this I gave.....

if(kd instanceof KeyDoc)
       out.write(kd.get("word"));

then the error is ....

KeyDocOutputFormat.java:50: unexpected type
found   : KeyDoc
required: class or array
                if(kd instanceof KeyDoc)

Can someone help me in debugging it ..... 

--
vJay

PS :: I attached the source code..