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using the Java language as any pollution reduction essay machine that supports Java can run the NameNode or DataNode modules. JobTracker is responsible not only for tracking and managing machine resources across the cluster, but also for maintaining a queue of currently running MapReduce Jobs. Hadoop Online Prototype extends the applicability of the model to pipelining behaviors, while preserving the simple programming model and fault tolerance. X., 'Improving mapreduce performance through data placement in heterogeneous hadoop clusters Parallel Distributed Processing, Workshops and Phd Forum (ipdpsw 2010 ieee International Symposium on, (2010) April,. A typical deployment has a dedicated machine that runs only the NameNode module. 3.2 hdfs Architecture The existence of a single NameNode in a cluster greatly simplifies the architecture of hdfs.

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