CSC352 Homework 4

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This homework is due 4/20/10, at midnight.


Problem #1

Below is the timeline of the WordCount program running on 4 xml files of 180 MB each on a cluster of 6 single-core Linux servers. (data available here). The files are in the HDFS on our cluster, in wikipages/block.

TaskTimeline4 180MBFiles.png

Question
Explain the camel back of the time line, in particular the dip in the middle of the Map tasks.
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