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updated chart
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== 3. How well does Hadoop scale? ==
- Hadoop has been demonstrated on clusters of up to 2000 nodes. Sort performance on 900 nodes
is good (sorting 9TB of data on 900 nodes takes around 2.5 hours) and [attachment:sort900-20070630.png
improving] using these non-default configuration values:
+ Hadoop has been demonstrated on clusters of up to 2000 nodes. Sort performance on 900 nodes
is good (sorting 9TB of data on 900 nodes takes around 2.25 hours) and [attachment:sort900-20070815.png
improving] using these non-default configuration values:
* `dfs.block.size = 134217728`
* `dfs.namenode.handler.count = 40`
* `mapred.speculative.execution = true`
* `mapred.reduce.parallel.copies = 20`
- * `mapred.tasktracker.tasks.maximum = 2`
* `mapred.child.java.opts = -Xmx512m`
* `fs.inmemory.size.mb = 200`
* `io.sort.factor = 100`
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