Difference between revisions of "CSC352 Problem of the Day"
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==Homework #4, Problem #2== | ==Homework #4, Problem #2== | ||
| − | Conditions: Processing of wiki pages with Hadoop on 6-PC cluster | + | * Conditions: |
| + | ** Processing of wiki pages with Hadoop on 6-PC cluster | ||
| + | ** Same Mapper and same Reducer program to process two different input folders | ||
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| + | <br /> | ||
<center> | <center> | ||
| − | {| | + | {|style="color:green; background-color:#ccffcc;" cellpadding="10" cellspacing="0" border="1" |
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! Number of files | ! Number of files | ||
! Number of wiki pages | ! Number of wiki pages | ||
| + | ! Number of categories | ||
! Execution Time<br />(seconds) | ! Execution Time<br />(seconds) | ||
|- | |- | ||
| 589 | | 589 | ||
| 589 | | 589 | ||
| + | | 832 | ||
| 388 | | 388 | ||
|- | |- | ||
| 1 | | 1 | ||
| 117,617 | | 117,617 | ||
| + | | 51,120 | ||
| 30.7 | | 30.7 | ||
| + | |- | ||
| + | | Ratio=589/1 | ||
| + | | Ratio=1/199 | ||
| + | | Ratio=1/61.4 | ||
| + | | Ratio=12.6/1 | ||
|} | |} | ||
</center> | </center> | ||
| + | <br /> | ||
| + | <br /> | ||
* Discuss these results | * Discuss these results | ||
| + | * If you were to add another column to this table, what quantity would you add? | ||
* Identify the parties responsible for this surprising difference | * Identify the parties responsible for this surprising difference | ||
| + | <font color="white">I would add a column showing the number of splits. I think the main culprit is the HDFS, and the fact that a lot of information has to flow through one ethernet switch that is pretty old, and slow...</font> | ||
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| + | [[Category:CSC352]][[Category:Hadoop]][[Category:MapReduce]] | ||
Latest revision as of 08:20, 27 April 2010
Homework #4, Problem #2
- Conditions:
- Processing of wiki pages with Hadoop on 6-PC cluster
- Same Mapper and same Reducer program to process two different input folders
| Number of files | Number of wiki pages | Number of categories | Execution Time (seconds) |
|---|---|---|---|
| 589 | 589 | 832 | 388 |
| 1 | 117,617 | 51,120 | 30.7 |
| Ratio=589/1 | Ratio=1/199 | Ratio=1/61.4 | Ratio=12.6/1 |
- Discuss these results
- If you were to add another column to this table, what quantity would you add?
- Identify the parties responsible for this surprising difference
I would add a column showing the number of splits. I think the main culprit is the HDFS, and the fact that a lot of information has to flow through one ethernet switch that is pretty old, and slow...
