Re: cleanup() in hadoop results in aggregation of whole file/not

2015-03-01 Thread Ulul 
Edit : instead of buffering in Hash and then emitting at cleanup you can 
use a combiner. Likely slower but easier to code if speed is not your 
main concern


Le 01/03/2015 13:41, Ulul a écrit :

Hi

I probably misunderstood your question because my impression is that 
it's typically a job for a reducer. Emit local min and max with two 
keys from each mapper and you will easily get gobal min and max in reducer


Ulul
Le 28/02/2015 14:10, Shahab Yunus a écrit :
As far as I understand cleanup is called per task. In your case I.e. 
per map task. To get an overall count or measure, you need to 
aggregate it yourself after the job is done.


One way to do that is to use counters and then merge them 
programmatically at the end of the job.


Regards,
Shahab

On Saturday, February 28, 2015, unmesha sreeveni 
unmeshab...@gmail.com mailto:unmeshab...@gmail.com wrote:



​I am having an input file, which contains last column as class label
7.4 0.29 0.5 1.8 0.042 35 127 0.9937 3.45 0.5 10.2 7 1
10 0.41 0.45 6.2 0.071 6 14 0.99702 3.21 0.49 11.8 7 -1
7.8 0.26 0.27 1.9 0.051 52 195 0.9928 3.23 0.5 10.9 6 1
6.9 0.32 0.3 1.8 0.036 28 117 0.99269 3.24 0.48 11 6 1
...
I am trying to get the unique class label of the whole file.
Inorder to get the same I am doing the below code.

/public class MyMapper extends MapperLongWritable, Text,
IntWritable, FourvalueWritable{/
/SetString uniqueLabel = new HashSet();/
/
/
/public void map(LongWritable key,Text value,Context context){/
///Last column of input is classlabel./
/ VectorString cls = CustomParam.customLabel(line,
delimiter, classindex); // /
/ uniqueLabel.add(cls.get(0));/
/}/
/public void cleanup(Context context) throws IOException{/
///find min and max label/
/ context.getCounter(UpdateCost.MINLABEL).setValue(Long.valueOf(minLabel));/
/ context.getCounter(UpdateCost.MAXLABEL).setValue(Long.valueOf(maxLabel));/
/}/
Cleanup is only executed for once.

And after each map whether Set uniqueLabel = new HashSet(); the
set get updated,Hope that set get updated for each map?
Hope I am able to get the uniqueLabel of the whole file in cleanup
Please suggest if I am wrong.

Thanks in advance.

Re: cleanup() in hadoop results in aggregation of whole file/not

2015-03-01 Thread Ulul 

Hi

I probably misunderstood your question because my impression is that 
it's typically a job for a reducer. Emit local min and max with two 
keys from each mapper and you will easily get gobal min and max in reducer


Ulul
Le 28/02/2015 14:10, Shahab Yunus a écrit :
As far as I understand cleanup is called per task. In your case I.e. 
per map task. To get an overall count or measure, you need to 
aggregate it yourself after the job is done.


One way to do that is to use counters and then merge them 
programmatically at the end of the job.


Regards,
Shahab

On Saturday, February 28, 2015, unmesha sreeveni 
unmeshab...@gmail.com mailto:unmeshab...@gmail.com wrote:



​I am having an input file, which contains last column as class label
7.4 0.29 0.5 1.8 0.042 35 127 0.9937 3.45 0.5 10.2 7 1
10 0.41 0.45 6.2 0.071 6 14 0.99702 3.21 0.49 11.8 7 -1
7.8 0.26 0.27 1.9 0.051 52 195 0.9928 3.23 0.5 10.9 6 1
6.9 0.32 0.3 1.8 0.036 28 117 0.99269 3.24 0.48 11 6 1
...
I am trying to get the unique class label of the whole file.
Inorder to get the same I am doing the below code.

/public class MyMapper extends MapperLongWritable, Text,
IntWritable, FourvalueWritable{/
/SetString uniqueLabel = new HashSet();/
/
/
/public void map(LongWritable key,Text value,Context context){/
///Last column of input is classlabel./
/ VectorString cls = CustomParam.customLabel(line,
delimiter, classindex); // /
/ uniqueLabel.add(cls.get(0));/
/}/
/public void cleanup(Context context) throws IOException{/
///find min and max label/
/ context.getCounter(UpdateCost.MINLABEL).setValue(Long.valueOf(minLabel));/
/ context.getCounter(UpdateCost.MAXLABEL).setValue(Long.valueOf(maxLabel));/
/}/
Cleanup is only executed for once.

And after each map whether Set uniqueLabel = new HashSet(); the
set get updated,Hope that set get updated for each map?
Hope I am able to get the uniqueLabel of the whole file in cleanup
Please suggest if I am wrong.

Thanks in advance.

Re: cleanup() in hadoop results in aggregation of whole file/not

2015-02-28 Thread Shahab Yunus 
As far as I understand cleanup is called per task. In your case I.e.
per map task. To get an overall count or measure, you need to aggregate
it yourself after the job is done.

One way to do that is to use counters and then merge them programmatically
at the end of the job.

Regards,
Shahab

On Saturday, February 28, 2015, unmesha sreeveni unmeshab...@gmail.com
wrote:


 ​I am having an input file, which contains last column as class label
 7.4 0.29 0.5 1.8 0.042 35 127 0.9937 3.45 0.5 10.2 7 1
 10 0.41 0.45 6.2 0.071 6 14 0.99702 3.21 0.49 11.8 7 -1
 7.8 0.26 0.27 1.9 0.051 52 195 0.9928 3.23 0.5 10.9 6 1
 6.9 0.32 0.3 1.8 0.036 28 117 0.99269 3.24 0.48 11 6 1
 ...
 I am trying to get the unique class label of the whole file. Inorder to
 get the same I am doing the below code.

 *public class MyMapper extends MapperLongWritable, Text, IntWritable,
 FourvalueWritable{*
 *SetString uniqueLabel = new HashSet();*

 *public void map(LongWritable key,Text value,Context context){*
 *//Last column of input is classlabel.*
 * VectorString cls = CustomParam.customLabel(line, delimiter,
 classindex); // *
 * uniqueLabel.add(cls.get(0));*
 *}*
 *public void cleanup(Context context) throws IOException{*
 *//find min and max label*
 *
  context.getCounter(UpdateCost.MINLABEL).setValue(Long.valueOf(minLabel));*
 *
  context.getCounter(UpdateCost.MAXLABEL).setValue(Long.valueOf(maxLabel));*
 *}*
 Cleanup is only executed for once.

 And after each map whether Set uniqueLabel = new HashSet(); the set get
 updated,Hope that set get updated for each map?
 Hope I am able to get the uniqueLabel of the whole file in cleanup
 Please suggest if I am wrong.

 Thanks in advance.

cleanup() in hadoop results in aggregation of whole file/not

2015-02-27 Thread unmesha sreeveni 
​I am having an input file, which contains last column as class label
7.4 0.29 0.5 1.8 0.042 35 127 0.9937 3.45 0.5 10.2 7 1
10 0.41 0.45 6.2 0.071 6 14 0.99702 3.21 0.49 11.8 7 -1
7.8 0.26 0.27 1.9 0.051 52 195 0.9928 3.23 0.5 10.9 6 1
6.9 0.32 0.3 1.8 0.036 28 117 0.99269 3.24 0.48 11 6 1
...
I am trying to get the unique class label of the whole file. Inorder to get
the same I am doing the below code.

*public class MyMapper extends MapperLongWritable, Text, IntWritable,
FourvalueWritable{*
*SetString uniqueLabel = new HashSet();*

*public void map(LongWritable key,Text value,Context context){*
*//Last column of input is classlabel.*
* VectorString cls = CustomParam.customLabel(line, delimiter,
classindex); // *
* uniqueLabel.add(cls.get(0));*
*}*
*public void cleanup(Context context) throws IOException{*
*//find min and max label*
*
 context.getCounter(UpdateCost.MINLABEL).setValue(Long.valueOf(minLabel));*
*
 context.getCounter(UpdateCost.MAXLABEL).setValue(Long.valueOf(maxLabel));*
*}*
Cleanup is only executed for once.

And after each map whether Set uniqueLabel = new HashSet(); the set get
updated,Hope that set get updated for each map?
Hope I am able to get the uniqueLabel of the whole file in cleanup
Please suggest if I am wrong.

Thanks in advance.