java basics for hadoop

CD hadoop-2.4.1/lib/nativeFile libhadoop.so.1.0.0 to view your own version of HadoopView dependent libraries with the LDD commandLDD libhadoop.so.1.0.0LDD--version native version of GCChttp://blog.csdn.net/l1028386804/article/details/51538611Should be due to the GCC version of the problem, this will be compiled for a long time, so the solution is to comment out the log4j inside, or in the beginning of the installation of Linux after the upgrade and gl

to be closed manually, System.out is also an output stream, and if true, it will not output theIoutils.copybytes (in, System.out, 1024,false); In.close (); }Delete a file or folder/**Delete a file or folder * True: Indicates whether to delete recursively, if it is a file, here is True,false is indifferent, * folder must be true, otherwise error *@throwsurisyntaxexception*/ Public Static voidDelete ()throwsIOException, urisyntaxexception {FileSystem FileSystem=Getfilesystem (); BooleanisD

(Text.class); Job.setmapoutputvalueclass (Longwritable.class); Job.setreducerclass (Jreducer.class); Job.setoutputkeyclass (Text.class); Job.setoutputvalueclass ( Longwritable.class); Fileoutputformat.setoutputpath (Job, Outpath); Job.setoutputformat (textoutputformat.class);// Use Jobclient.runjob instead of job.waitForCompletionJobClient.runJob (job);}}Can seeIn fact, the old version of the API is not very different, just a few classes replaced itNote that the old version of the API class is

")); SYSTEM.OUT.PRINTLN (flag); @Test public void Testupload () throws IllegalArgumentException, ioexception{fsdataoutputstream out = FS . Create (New Path ("/words.txt")); FileInputStream in = new FileInputStream (New File ("E:/w.txt")); Ioutils.copybytes (in, out, 2048, true); public static void Main (string[] args) throws Exception {Configuration conf = new Configuration (); Conf.set ("Fs.defaultfs", "hdfs://123.206.xxx.xxx:9000"); Conf.set (

Testhivedrivertable1terry2alex3jimmy4mike5katerunning:select count (1) from TesthivedrivertableIn fact, the Java call is very simple, that is, you execute the statement in the hive shell with JDBC to do it again, so you transfer the past statement of the environment is the Hive server machine, which is written in the path from the hive server host root directory path to find data, So our a.txt has to be uploaded to the server, and this code will run

Parameters required for configuration:Configuration conf = new Configuration();conf.set("fs.defaultFS", "hdfs://hadoop2cluster");conf.set("dfs.nameservices", "hadoop2cluster");conf.set("dfs.ha.namenodes.hadoop2cluster", "nn1,nn2");conf.set("dfs.namenode.rpc-address.hadoop2cluster.nn1", "10.0.1.165:8020");conf.set("dfs.namenode.rpc-address.hadoop2cluster.nn2", "10.0.1.166:8020");conf.set("dfs.client.failover.proxy.provider.hadoop2cluster", "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFai

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JAVA basics, strings, and java BasicsString (a character array, constant, unchangeable ): 1. Create and initialize a string: 1). Use a String constant to initialize String s = "hello! "; 2). Create and initialize a String () using the constructor; // Initialize an object, indicating a NULL Character Sequence String (value); // creates a new object using an existi

and writes its contents of 第101-120 bytes to the local file system Import Org.apache.hadoop.conf.configuration;import Org.apache.hadoop.fs.filesystem;import Org.apache.hadoop.fs.path;import Org.apache.hadoop.io.ioutils;import Java.io.bufferedoutputstream;import Java.io.file;import Java.io.fileoutputstream;import Java.io.inputstream;import Java.io.OutputStream;import Java.net.uri;public class Outputtest {public static void main (string[] args) {try {String dst = ar Gs[0]; S

Objective: In this case, the default is to create a MAVEN project in Eclipse and configure the Hadoop resource. The following is the configuration information for Pom.xml Overview: 1: In one JVM one object can invoke the resources of another object, but it is necessary to do so by means of an RPC protocol if an object in multiple JVM,JVMA calls an object in JVMB. : The 2:RPC protocol uses the CS structure, and the requester is equivalent to a client

(i) Download installation1. Download VISUALVMDownload on official website, with Mac version2, tools-Plug-ins, select the plug of interest to installAt this point, if there is a local running Java process, then the local there is already able to monitor the analysis(ii) Remote server configuration1, in any directory to establish the file Jstatd.all.policy, the contents are as follows:Grant CodeBase "file:${java.home}/. /lib/tools.jar "{Permission java.

admin = new hbaseadmin (conf); Admin.disabletable ("account"); Admin.deletetable ("account"); Admin.close ();} @Testpublic void Testput () throws exception{htable table = new htable (conf, "user"); Put put = new put (Bytes.tobytes ("rk0003"));p Ut.add (bytes.tobytes ("info"), Bytes.tobytes ("name"), Bytes.tobytes (" Liuyan ")); Table.put (put); Table.close ();} @Testpublic void Testget () throws exception{htable table = new htable (conf, "user"); Get get = new Get (Bytes.tobytes ("rk0001")); Ge

is append (), which allows data to be appended at the end of an existing file The progress () method is used to pass the callback interface, which notifies the application that the data is being written to Datenode. 1String localsrc = args[0];2String DST = args[1];3 //get file Read stream4InputStream in =NewInputStream (NewFileInputStream (LOCALSRC));5 6Configuration conf =NewConfiguration ();7FileSystem fs =Filesystem.get (Uri.create (DST), conf);8OutputStream out = Fs,create (NewPath

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-------Android Training, Java training, look forward to communicating with you! ----------The reflection mechanism of Java is one of the characteristics of Java, the reflection mechanism is the foundation of the framework technology, using reflection can make the program more flexible, avoid writing the program to die in the code. For many beginners who have only

Java environment:1. What are bytecode and virtual machines?2. Setting of environment variables3. Some common Java commands4. How does the computer run the Java program?5. Java Garbage collector6. Basic data types and conversions for JavaExample: The first Java programAn arra

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Java basics-New I/O technology (NIO) and basics nioBefore JDK1.4, I/O input/output processing is called the old I/O processing. Beginning with JDK1.4, java provides a series of improved new input/output features, these functions are called new I/O (new I/O) and many NEW classes are added for processing input/output.Jav

Java basics --- I/O technology (3), basics --- I Followed by the previous java basics-I/O technology (2)Java object serialization and deserialization what is object serialization and deserialization? To complete the input or outpu