hadoop3

问题 I tried this command in command prompt (run as administrator): hadoop jar C:\Users\tejashri\Desktop\Hadoopproject\WordCount.jar WordcountDemo.WordCount /work /out but i got this error message: my application got stopped. 2020-04-04 23:53:27,918 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032 2020-04-04 23:53:28,881 WARN mapreduce.JobResourceUploader: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner

问题 I am trying to install Hadoop(3.1.2) on Windows-10, but data node and node manager shuts down. I have tried downloading and placing the winutils.exe and hadoop.dll files under bin directory. I have also tried changing the permissions of the files and running as an administrator. But it didn't fix the error Datanode shutdown error 2019-02-12 12:01:30,856 INFO checker.ThrottledAsyncChecker: Scheduling a check for [DISK]file:/D:/Installs/IT/hadoop-3.1.2/data/datanode 2019-02-12 12:01:30,888 WARN

问题 I am in a databasing class at school and my professor is having us work with hadoop v3.2.1. In following a youtube tutorial to install on windows, I am stuck on the formatting namenode part. this is what comes up in cmd: 2020-03-15 15:38:05,819 INFO util.GSet: Computing capacity for map NameNodeRetryCache 2020-03-15 15:38:05,819 INFO util.GSet: VM type = 64-bit 2020-03-15 15:38:05,820 INFO util.GSet: 0.029999999329447746% max memory 889 MB = 273.1 KB 2020-03-15 15:38:05,820 INFO util.GSet:

问题 I'm trying to setup an Hadoop 3 cluster. Two questions about the Erasure Coding feature : How I can ensure that erasure coding is enabled ? Do I still need to set the replication factor to 3 ? Please indicate the relevant configuration properties related to erasure coding/replication, in order to get the same data security as Hadoop 2 (replication factor 3) but with the disk space benefits of Hadoop 3 erasure coding (only 50% overhead instead of 200%). 回答1: In Hadoop3 we can enable Erasure

问题 I have updated the /conf/slaves file on the Hadoop master node with the hostnames of my slave nodes, but I'm not able to start the slaves from the master. I have to individually start the slaves, and then my 5-node cluster is up and running. How can I start the whole cluster with a single command from the master node? Also, SecondaryNameNode is running on all the slaves. Is that a problem? If so, how can I remove them from the slaves? I think there should only be one SecondaryNameNode in a

问题 I am new to hadoop. I'm trying to install hadoop in my laptop in Pseudo-Distributed mode. I am running it with root user, but I'm getting the error below. root@debdutta-Lenovo-G50-80:~# $HADOOP_PREFIX/sbin/start-dfs.sh WARNING: HADOOP_PREFIX has been replaced by HADOOP_HOME. Using value of HADOOP_PREFIX. Starting namenodes on [localhost] ERROR: Attempting to operate on hdfs namenode as root ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation. Starting datanodes ERROR:

问题 I'm trying to setup Hadoop3-alpha3 with a Single Node Cluster (Psuedo-distributed) and using the apache guide to do so. I've tried running the example MapReduce job but every time the connection is refused. After running sbin/start-all.sh I've been seeing these exceptions in the ResourceManager log (and similarly in the NodeManager log): xxxx-xx-xx xx:xx:xx,xxx INFO org.apache.commons.beanutils.FluentPropertyBeanIntrospector: Error when creating PropertyDescriptor for public final void org

问题 I have a vagrant box on debian/stretch64 I try to install Hadoop3 with documentation http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/SingleCluster.htm When I run start-dfs.sh I have this message vagrant@stretch:/opt/hadoop$ sudo sbin/start-dfs.sh Starting namenodes on [localhost] pdsh@stretch: localhost: connect: Connection refused Starting datanodes pdsh@stretch: localhost: connect: Connection refused Starting secondary namenodes [stretch] pdsh@stretch: stretch:

问题 I run Hadoop 3.0.0-alpha1 on windows and added Hive 2.1.1 to it. When I try to open the hive beeline with the hive command I get an error: Error applying authorization policy on hive configuration: Couldn't create directory ${system:java.io.tmpdir}\${hive.session.id}_resources Whats wrong? I run mysql as metastore for Hive and added the required files in HDFS: hadoop fs -mkdir /user/hive hadoop fs -mkdir /user/hive/warehouse hadoop fs -mkdir /tmp After that I changed the permissions: hadoop

问题 HDFS 2.7 is default version for HBase 2.0.0. For HBase Stable version, it is, 2.5. I just started HDFS cluster with version 3.1.0. How do I make HBase to use this? I get hsync error message. EDIT I am understanding that I have to replace all these jar files? hadoop-*-2.7.4.jar enter image description here 回答1: If you refer to Latest compatible version of hadoop and hbase then follow the link provided which is http://hbase.apache.org/book.html#configuration you will see that your combination