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units1) data block size of Hadoop1.0:64M2) Hadoop2.0 database size: 128M2. In full distribution mode, at least two datanode nodes 3. Directory of Data Preservation: by Hadoop.tmp.dir parameter specifies secondary NameNode(second called node) 1. Main role: Merging logs2. Timing of consolidation: when HDFs issues checkpoints3. Log merge process: Problems with HDFs 1) Namenode si

MapReduce LearningMAP ": The main node reads input data, divides it into small chunks that can be solved in the same way (here is a divide-and-conquer idea), and distributes these small chunks to different working nodes (Worder nodes), each working node (worder node) Loop to do the same thing, this is going to be a tree-row structure (many of the models in distributed computing are related to graph theory, PageRank is also), and each leaf node has to

completes, the JDK folder will be generated in the/opt/tools directory./jdk-6u34-linux-i586.binTo configure the JDK environment command:[Email protected]:/opt/tools# sudo gedit/etc/profileTo enter the profile file, change the file:Export java_home=/opt/tools/jdk1.6.0_34Export Jre_home= $JAVA _home/jreExport classpath= $JAVA _home/lib: $JRE _home/lib: $CLASSPATHExport path= $JAVA _home/bin: $JRE _home/bin: $PATHSave file, closeExecute the following command to make the configuration file effectiv

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