用java运行Hadoop例程报错:org.apache.hadoop.fs.LocalFileSystem cannot be cast to org.apache.所写代码如下: package com.pcitc.hadoop; import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.h…

环境: openSUSE42.2 hadoop2.6.0-cdh5.10.0 spark1.6.0-cdh5.10.0 按照网上的spark安装教程安装完之后,启动spark-shell,出现如下报错: 报错信息: Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/fs/FSDataInputStream at org.apache.spark.deploy.SparkSubmitA…

报错现象: Exception in thread "main" java.lang.NoClassDefFoundError: Lorg/apache/hadoop/fs/FileSystem; at java.lang.Class.getDeclaredFields0(Native Method) at java.lang.Class.privateGetDeclaredFields(Class.java:2583) at java.lang.Class.getDeclaredFi…

在执行spark on hive 的时候在  sql.show()处报错 : Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/fs/CanUnbuffer 报错详情: Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/fs/CanUnbuffer at jav…

错误提示信息如下 错误信息如下 [root@node1 bin]# ./hive Logging initialized -bin/lib/hive-common-.jar!/hive-log4j.properties Exception in thread "main" java.lang.RuntimeException: java.lang.IllegalArgumentException: java.net.URISyntaxException: Relative path i…

org.apache.hadoop.fs.FsUrlStreamHandlerFactory在org.apache.hadoop类中,org.apache.hadoop在hadoop安装目录下.…

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/fs/FSDataInputStream at org.apache.spark.deploy.SparkSubmitArguments.handleUnknown(SparkSubmitArguments.scala:) at org.apache.spark.launcher.SparkSubmitOptionParser.par…

报错内容如下: Exception in thread "main" org.apache.hadoop.fs.UnsupportedFileSystemException: No FileSystem for scheme "hdfs"at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:3332)at org.apache.hadoop.fs.FileSystem.create…

我在使用 Structured Streaming 的 ForeachWriter,写 HDFS 文件时,出现了这个异常 这个异常出现的原因是HDFS作为一个分布式文件系统,支持多线程读,但是不支持多线程写入.所以HDFS引入了一个时间类型的锁机制,也就是HDFS的租约机制(** lease holder**). 这个知识点来源于这篇文章 大数据计算时,多线程与分布式的并行可以很好的加速数据的处理速度.可在大数据存储时,分布式的文件存储系统对并发的写请求支持存在天然的缺陷.这是一对天然的矛盾,暂…

spark1(默认CDH自带版本)不存在这个问题,主要是升级了spark2(CDHparcel升级)版本安装后需要依赖到spark1的旧配置去读取hadoop集群的依赖包. 1./etc/spark2/conf目录需要指向/hadoop1/cloudera-manager/parcel-repo/SPARK2-2.1.0.cloudera1-1.cdh5.7.0.p0.120904/etc/spark2/conf.dist (命令ln -s /hadoop1/cloudera-manager/p…

现象 通过load data local导入本地文件时报无法导入的错误 hive> load data local inpath '/home/hadoop/out/mid_test.txt' overwrite into table my_mid.mid_test partition (etl_date=20190101); Loading data to table my_mid.mid_test partition (etl_date=20190101) Failed with excep…

当ChecksumFileSystem出现问题时抛出 package org.apache.hadoop.fs; import java.io.IOException; /** Thrown for checksum errors. */ public class ChecksumException extends IOException { private long pos; public ChecksumException(String description, long pos) { su…

换了个环境,出现此异常 016-10-18 23:54:01,334 WARN [org.apache.hadoop.util.NativeCodeLoader] - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 2016-10-18 23:54:01,668 INFO [org.apache.hadoop.conf.Configurati…

异常: org.apache.hadoop.security.AccessControlException: Permission denied: user=root, access=WRITE, inode="/user":hdfs:supergroup:drwxr-xr-x at org.apache.hadoop.hdfs.server.namenode.DefaultAuthorizationProvider.checkFsPermission(DefaultAuthoriza…

在master(即:host2)中执行 hadoop jar hadoop-test-1.1.2.jar DFSCIOTest -write -nrFiles 12 -fileSize 10240 -resFile test 最后fail,为啥,看了一下日志 org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /benchmarks/TestDFSIO/io_data/test_io_0 could only be r…

终于遇到第一块硬骨头 Hadoop没有使用java.util.Properties管理配置文件,而是自己定义了一套配置文件管理系统和自己的API. package org.apache.hadoop.conf; import java.io.BufferedInputStream; import java.io.DataInput; import java.io.DataOutput; import java.io.File; import java.io.FileInputStream; im…

今天在测试mapreduce的程序时,就是简单的去重,对照课本上的程序和自己的程序,唯一不同的就是“org.apache.hadoop.mapreduce.Reducer.Context context”,我写的程序如下: package com.pro.bq; import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.…

封装了FSInputStream package org.apache.hadoop.fs; import java.io.BufferedInputStream; import java.io.IOException; /** * A class optimizes reading from FSInputStream by bufferring */ //通过缓存优化FSInputStream读取 public class BufferedFSInputStream extends Buff…

package org.apache.hadoop.fs; import java.io.*; import org.apache.hadoop.fs.*; /** Stream that permits positional reading. */ //定位流式读取 public interface PositionedReadable { /** * Read upto the specified number of bytes, from a given * position within…

本来要先看BufferedFSInputStream的,但是它实现了Seekable和PositionedReadable接口,就先看这两个,再看它会比较容易理解些 package org.apache.hadoop.fs; import java.io.*; /** Stream that permits seeking. */ //提供按位置查找功能的接口 public interface Seekable { /** * Seek to the given offset from the…

工具类吧 package org.apache.hadoop.fs; import org.apache.hadoop.io.*; //IO包下的类还没涉及到.遇到一个分析一个. import java.io.*; /* * A BlockLocation lists hosts, offset and length * of block. * */ //记录block的元数据信息,如所在host,长度和偏移量 public class BlockLocation implements Writ…

http://blog.csdn.net/pipisorry/article/details/51340838 'Hadoop DFS'和'Hadoop FS'的区别 While exploring HDFS, I came across these two syntaxes for querying HDFS: > hadoop dfs > hadoop fs why we have two different syntaxes for a common purpose 为什么会对同一个功能…

今天使用JDBC来操作Hive时,首先启动了hive远程服务模式:hiveserver2 &(表示后台运行),然后到eclipse中运行程序时出现错误: java.sql.SQLException: Could not open client transport with JDBC Uri: jdbc:hive2://192.168.182.11:10000/default: Failed to open new session: java.lang.RuntimeException: org.…

报错 java.lang.Exception: java.lang.ClassCastException: org.apache.hadoop.mapreduce.lib.input.FileSplit cannot be cast to org.apache.hadoop.mapred.FileSplit    at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)    at org.a…

在 windows 上运行 MapReduce 时报如下异常 Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Ljava/lang/String;I)Z at org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Native Method) at or…

1.window操作系统的eclipse运行wordcount程序出现如下所示的错误: Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Ljava/lang/String;I)Z at org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Native…

1:问题出现的原因,部署好的hadoop-2.6.4进行window10操作hadoop api出现的错误,具体错误是我向hdfs上传文件,还好点,之前解决过,这里不叙述,这里说一下从hdfs下载文件出现的错误: 详细错误如下所示: java.lang.NullPointerException at java.lang.ProcessBuilder.start(Unknown Source) at org.apache.hadoop.util.Shell.runCommand(Shell.jav…

1:初学hadoop遇到各种错误,这里贴一下,方便以后脑补吧,报错如下: 主要是在window环境下面搞hadoop,而hadoop部署在linux操作系统上面:出现这个错误是权限的问题,操作hadoop是虚拟机的主机用户不是window的主机用户Administrator,所以出现下面的错误,解决办法如下所示(或者修改文件的权限,即所有者都可以进行可读,可写,可执行): log4j:WARN No appenders could be found for logger (org.apache.…

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Hbase master启动报错: java.lang.RuntimeException: Failed construction of Master: class org.apache.hadoop.hbase.master.HMaster at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:2893) at org.apache.hadoop.hbase.master.HMasterCommandLin…