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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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locka=NULL; PrivateObject lockb=NULL; PublicThreada (Object a,object b) { This. locka=A; This. lockb=b; } Public voidrun () {synchronized(Locka) {System.out.println ("* * * Thread A: * *: Lock A"); Try{Thread.Sleep (3000); } Catch(Exception e) {//Todo:handle Exception } synchronized(lockb) {System.out.println ("* * * Thread A: * *: Lock B"); }} System.out.println ("* * * Thread A: * *: Finished"); }}classThreadbextendsthread{PrivateObject locka=NULL; PrivateObject lo

Jdbc BASICS (3) Big text, binary data processing, and jdbc Data Processing LOB (Large Objects)Divided:CLOBAndBLOBBig text and big binary data CLOB: used to store large text BLOB: used to store binary

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The python language has been increasingly liked and used by program stakeholders in recent years, as it is not only easy to learn and master, but also has a wealth of third-party libraries and appropriate management tools; from the command line script to the GUI program, from B/S to C, from graphic technology to scientific computing, Software development to automated testing, from cloud computing to virtualization, all these areas have python, Python has gone deep into all areas of program devel

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========================================================== ====================================== ... -- Conf Spark. yarn. JARS = HDFS: // $ hdfs_name/spark/sparkjars/*. Jar -- Conf Spark. yarn. JARS = HDFS: // $ hdfs_name/oozie/share/lib/lib_20180801161138/spark/spark-yarn_2.11-2.1.1.jar It can be seen that oozie will add a new spark. yarn. JARS configuration. If two identical keys are provided, what will spark do? Org. Apache. Spark. Deploy. sparksubmit Val appargs = new sparksubmitargument

Match Spark or Sperk Spark, Sperk 4. Text substitutionText substitution uses the following syntax format::[g][address]s/search-string/replace-string[/option]Where address is used to specify a replacement scope, the following table shows common examples:1 s/Downloading/Download//将当前缓冲区中的第一行到第五行中的Spark替换为spark:1,5 s/Spark/spark//将当前缓冲区中的第一行到当前光标所在行的Spark替换为spark:1,. s/Spark/spark//将当前光标所在行到缓冲区最后一行的Spark替换为spark:.,$ s/Spark/spark//将整个缓冲区中的Spark替换为spark:% s/Spark/spark//当前行中第一次搜

with P h Adoop, Hadaap :/e> like, source :/\ Find the string starting with had, \ also has special meaning hadoop, Hadoo :/spa * \ spark, Spaspark :/sp[ae]rk match spark or Sperk spark, Sperk 4. Text substitutionText substitution uses the following syntax format::[g][address]s/search-string/replace-string[/option]Wh