[jira] [Commented] (HAMA-940) Add StreamInputFormat

[Edward J. Yoon (JIRA)]

[ 
https://issues.apache.org/jira/browse/HAMA-940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15266013#comment-15266013
 ] 

Edward J. Yoon commented on HAMA-940:
-

If we can hide these implmentations and simplified APIs for processing stream 
data, I think this way is the better.

> Add StreamInputFormat
> -
>
> Key: HAMA-940
> URL: https://issues.apache.org/jira/browse/HAMA-940
> Project: Hama
>  Issue Type: New Feature
>  Components: bsp core
>Reporter: Edward J. Yoon
>
> Add StreamInputFormat that reads newly appended records from previous 
> superstep. 
> I roughly guess it will be possible using reopen() method and file offset.



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[jira] [Commented] (HAMA-940) Add StreamInputFormat

[Edward J. Yoon (JIRA)]

[ 
https://issues.apache.org/jira/browse/HAMA-940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15266012#comment-15266012
 ] 

Edward J. Yoon commented on HAMA-940:
-

As I mentioned in Description, we can simply check whether there's an newly 
appended records to the input file, keeping last read offset. 

To implement this, first of all, you should see the InputFormat interface 
class. The tricky issue is how we implement the getSplits() method and multiple 
tasks. 

At the moment, my simple idea is that one bsp task acts as a "Stream input 
queue" without implement StreamInputFormat and change the framework core. For 
example, we set the file path in job configuration. The master task acts like 
below: 

{code}
if(isMaster(peer.me)) {
  while(true) {
 peer.reopen(); // reopen
 peer.skip(offset); // jump to last offset
 if(peer.readNext()) {
 // at here we do load-balance.
sendTo("send a newly appended record to free slave tasks");
 } else {
Thread.sleep();
 }
  }
}
{code}



> Add StreamInputFormat
> -
>
> Key: HAMA-940
> URL: https://issues.apache.org/jira/browse/HAMA-940
> Project: Hama
>  Issue Type: New Feature
>  Components: bsp core
>Reporter: Edward J. Yoon
>
> Add StreamInputFormat that reads newly appended records from previous 
> superstep. 
> I roughly guess it will be possible using reopen() method and file offset.



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[jira] [Commented] (HAMA-941) Semiclustering Termination

[Edward J. Yoon (JIRA)]

[ 
https://issues.apache.org/jira/browse/HAMA-941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15265625#comment-15265625
 ] 

Edward J. Yoon commented on HAMA-941:
-

I just used \{code\} patch copied to clipboard \{code\} tag.

> Semiclustering Termination
> --
>
> Key: HAMA-941
> URL: https://issues.apache.org/jira/browse/HAMA-941
> Project: Hama
>  Issue Type: Improvement
>  Components: examples, graph
>Reporter: Edward J. Yoon
>Priority: Minor
>
> Currently Semiclustering example will be terminated when the number of 
> iterations exceeded the predefined threshold max iteration.
> App should be stopped if there's no cluster changes (I guess). Please check 
> and improve it.



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