Hadoop is an open-source solution for providing a distributed/replicated file system, a produciton grade map-reduce system, and has a series of complementary additions like Hive, Pig, and HBase to get more out of a Hadoop-powered cluster.

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How to access hadoop remotely

I have installed Hadoop on open-stack CentOS guest VM. I am able to open the site (From 192.168.0.10, VM-1) http://localhost:50070 http://192.168.0.10:50070 But not able to access the same from a ...
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22 views

Error: E0701 : E0701: XML schema error while running custom executor

I am trying to test the custom executor sample found here http://www.infoq.com/articles/ExtendingOozie and another sample about ftp action for extending Oozie. In both cases I cannot run the test. ...
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43 views

Hadoop data node start fails with error: java: cannot execute: Permission denied

I am facing an error in starting a Hadoop Data Node from Ambari WEB interface, and I need your help to resolve this. As always the error message is very comlex and long, but first thing first. Even ...
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1answer
26 views

How to know which script or executable is linked with a metric in ganglia?

I have just started to explore ganglia and my question is "How to know which script or executable is linked with a metric in ganglia?" The fact is that I don't know much about ganglia. I have good ...
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33 views

Running multiple Hive metastores against a single HDFS

I'm investigating the possiblity of implementing dedicated Hive instances, each with their own metastore residing on their own work node outside of the cluster, but accessing the same data on a shared ...
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1answer
37 views

slaves get a connection timed out with hdfs

I have 3 node instances - master, slave1 and slave2 SSHing between these nodes works fine. Here is the processes that starts on each node when I say ./sbin/start-dfs.sh master: SecondaryNameNode ...
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1answer
23 views

Unable to connect to Amazon EC2 and run pig

I have made an EC2 key pair and saved it to a location under my home directory on mac. Also I have changed permissions with 'chmod 600 /path/to/saved/keypair/file.pem'. Now I have followed the ...
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2answers
21 views

Unable to setup a connection to Amazon EC2 and run pig

I have made an EC2 key pair and saved it to a location under my home directory on mac. Also I have changed permissions with 'chmod 600 /path/to/saved/keypair/file.pem'. Now I have followed the ...
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66 views

Rhadoop hdfs.init() Error

I recently installed CDH5.1.0 along with R 3.1.*, and I got rmr2, rJava, and rhdfs all installed properly. (along with the required packages and set the required environment variables) After some ...
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61 views

Distributing Master node ssh key

For the master node to passwordless-ly ssh into the slaves, the master needs to distribute its ssh key to the slaves. Copying key using ssh-copy-id asks for the user password. If there are hundreds of ...
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2answers
87 views

hadoop-config.sh in bin/ and libexec/

While setting up hadoop, I found that hadoop-config.sh script is present in two directories, bin/ and libexec/. Both the files are identical. While looking onto scripts, I found that if ...
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2answers
185 views

error while running any hadoop hdfs file system command

I am very new to hadoop and referring to the "hadoop for dummies" book. I have a VM with following specs: hadoop version 2.0.6-alpha bigtop os centos The problem is when I run any hdfs file system ...
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38 views

hadoop hbase environment variables

I tried to setup a 4 node Hadoop cluster using CDH4.7. The cluster is up and running fine and when I submit a word count MR job it completed successfully but when I am submitting an MR job to insert ...
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1answer
530 views

Compile Hadoop Native Libraries to 64 Bits

I'm having trouble trying to compile a 64-bit version of Hadoop available on 32-bit Ubuntu. The compilation is necessary because I want to use the 64-bit files of libhadoop.so. Did anyone know where I ...
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1answer
103 views

Best practices - Conditionals for Chef resources without guard attributes?

We are setting up a cluster using Apache Ambari. Our Chef run is interrupted by the need to use Ambari to provision the Hadoop cluster. Current installs are a three part process: Initial Chef run ...
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31 views

Hadoop - dead or unregisterted node Exception

I get following exception - when I run Hadoop in the Multi node (2) environment. Master - Node - My Laptop - ubuntu 13 Kylin (116.203.210.25) Slave Node - Ubuntu 12 VM I follow - ...
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41 views

Hbase block locality index is always 0

I have a Hbase (v 0.94.19 with Hadoop 1.2.1) setup with one master machine and two region servers. Each region server has 16 GB heap (6.4 GB cache, 4.0 GB memstore) and 1.6 TB (2 X 800 GB) SSD disk ...
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1answer
176 views

HDFS' ZKFC service unable to start

Introduction CDH4's ZooKeeper Failover Controller (ZKFC) has been installed. Starting the ZKFC service: [vagrant@localhost ~]$ sudo service hadoop-hdfs-zkfc start Starting ...
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1answer
169 views

Unable to convert HDFS from non-HA to HA

Introduction Aim: Convert HDFS from non-HA to HA. Method: According to this documentation it should be possible to convert HFDS from non- to HA by implementing following configuration: ...
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51 views

Can I use Yarn to dynamically assign nodes for map reduce tasks

When I use Hadoop for executing the Map reduce tasks, I am unable to find the API to allow me assign the compute nodes for executing the task. Is there any simple way to let Resource manager ...
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1answer
442 views

Command to determine whether ZooKeeper Server is Leader or Follower

Introduction A ZooKeeper Quorum consisting of three ZooKeeper servers has been created. The zoo.cfg located on all three ZooKeeper servers looks as follows: maxClientCnxns=50 # The number of ...
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1answer
386 views

Could not start ZK at requested port of 2181, while export HBASE_MANAGES_ZK=false

Problem The first aim was to run HBase standalone. Navigating to ip:60010/master-status is succesfull once HBase has been started. The second aim is to run a distinct ZooKeeper quorum. ZooKeeper has ...
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1answer
79 views

Does Cloudera Manager need ongoing Root Access?

When installing Cloudera Manager 4, it asks for the root password on a passwordless sudo user to install packages. Does this account need to be retained, or is it just for initial setup?
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171 views

Can I change my hive external table storage format without affecting its partitions?

I want to change my external table storage format from text file to ORC file. I already added partitions around 500 for the external table stored as 'TEXTFILE'. If I simply create another external ...
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1answer
159 views

Cloudera Hadoop superuser group

I'm trying to create a group on one of my datanodes that will have superuser privileges for hdfs and associated fs commands. So far I have: Checked to see that ...
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2answers
121 views

In Hadoop, how to show current process of -copyFromLocal

I am still a newbie learner of Hadoop, and this time I was trying to process a 106GB file. I used -copyFromLocal to copy that big file to my Hadoop DFS, but since the file is big I have to wait for a ...
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19 views

When and how are initial directories created in HDFS

I have a Hadoop setup in which the configured HDFS umask is 027 instead of the default one. Some of the initially created directories have correct permissions (like tmp drwxrwxrwx) but others such as ...
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122 views

How to start hadoop on CentOS

I have installed hadoop using Yum on CentOS: yum install hadoop Now I want to start hadoop but cannot find the start-all.sh script mentioned on many blogs and wiki pages such as ...
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2answers
1k views

“/usr/bin/env: bash: No such file or directory” during puppet exec command

I am setting my first steps into puppet. I am trying to setup ambari. This is my puppet config: exec { "ambari-repo": command => "curl ...
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1answer
110 views

Cannot print hdfs topology when using viewfs:/// as fs.defaultFS

I am using Rack Awareness technology in HDFS, I can use the following command to get topology: hdfs dfsadmin -printTopology Today, after setting up HDFS Federation and use viewfs instead of hdfs ...
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403 views

Encounter an error when configuer secure hadoop : org.apache.hadoop.security.AccessControlException

I try to configure secure hadoop with kerberos. I have started KDC server , generated and copy related keytab to corresponding node. kerberos can work normally (use kinit) but when i try to start ...
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48 views

Hadoop - On the Wire Performance Monitoring?

I have been tasked with implementing an 'on the wire' monitoring solution for a large Hadoop installation. The source of data will be a combination of taps and SPANs throughout the environment. My ...
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84 views

Apache Kafka and Apache Hadoop installation on a single node

If Apache Kafka and Apache Hadoop are installed on a single node, should they share common ZooKeeper instance? If the answer is yes, what's the proper configuration of ZooKeeper? Thanks!
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2answers
111 views

packet loss between two specific VMs

I am experiencing some high-percentage packet loss (more than 70%) between two specific VMs in a local network, in a remote cluster (I have no physical access to it). One machine is used as a hadoop ...
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1answer
326 views

Hortonworks HDP 2.x Java error

I am trying to run the following command but I am getting the below error Could anyone explain it to me hdfs fsck / -files -blocks -locations > dfs-new-fsck-1.log I am trying to install ...
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1answer
151 views

Additional Storage Options for Hadoop HDFS Nodes

We have a small production Cloudera distribution Hadoop cluster(14 nodes, but growing). As we have expanded our usage of this cluster we have found that disk storage is our biggest blocker and ...
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1answer
98 views

CDH3 rebalancer without Cloudera Manager

We recently added new nodes to the cluster and I want to run the re-balancer to distribute the data among these nodes. We are using CDH3 and whole system is cheffed - I am not even sure if there is ...
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1answer
321 views

Changing ulimit on ubuntu 12.04 Never works

I am working with hadoop and need to change number of open files ulimit -n. I have seen similar questions on stackoverflow and elsewhere and have tried everything in those answers, but it still does ...
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1answer
45 views

Grid storage for large files on multiple external machines

I have several dedicated servers with unused space on them. 16GB+ RAM, some have SSD, other HDD. All have minimum 100Mbps connection. OS is Debian 7 64bit. There is no LAN connection between machines ...
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2answers
469 views

HDFS datanode startup fails when disks are full

Our HDFS cluster is only 90% full but some datanodes have some disks that are 100% full. That means when we mass reboot the entire cluster some datanodes completely fail to start with a message like ...
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1answer
372 views

Hadoop single node cluster memory and storage requirements

I have been advised to learn Hadoop for my company and so I want to build a test environment. The company I work for has a datacentre with a VMware vCloud infrastructure which they use to sell ...
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1answer
53 views

What tool/application (free or not) should I use to generate and write lots (TBs) of data, fast [closed]

I am testing a storage appliance and need to write TeraBytes of data to it. Using fio or dd takes days to write that much amount of data. Are there any (free or not-free) tools/applications, that I ...
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1answer
1k views

Reverse and Forward DNS set up correctly but sometimes MapReduce job fails

Ever since we switched over our cluster to communicate via private interfaces and created a DNS server with correct forward and reverse lookup zones, we get this message before the M/R job runs: ...
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1answer
26 views

Setting up a Hive Remote Metastore with Kerberos

I'm new to hive and trying to set it up in a relatively secure manner for a test environment. I want to use a remote metastore so MR jobs can access the DB. I seem to have things almost working, but ...
0
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1answer
143 views

Setting up multiple Hadoop clusters [closed]

Hopefully this question isn't off topic. I asked this on AskUbuntu but haven't gotten a responses: I've followed Michael Noll's excellent guide to get Hadoop set up on a single cluster: ...
2
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1answer
968 views

Hadoop HDFS Backup & DR Strategy

We are preparing to implement our first Hadoop cluster. As such we are starting out small with a four node setup. (1 master node, and 3 worker nodes) Each node will have 6TB of storage. (6 x 1TB ...
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2k views

How to fix Hadoop HDFS cluster with missing blocks after one node was reinstalled?

I have a 5 slave Hadoop cluster (using CDH4)---slaves are where DataNode and TaskNode run. Each slave has 4 partitions dedicated to HDFS storage. One of the slaves needed a reinstall and this caused ...
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1answer
26 views

Is Elastic Workload Re-provisioning still possible with DataStax Enterprise 3.1?

In the documentation of DataStax Enterprise (DSE) 2.0 there is a chapter about "Elastic Workload Re-provisioning" (http://www.datastax.com/docs/datastax_enterprise2.0/workload_reprovisioning) but it ...
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323 views

Use Amazon SNS to send nagios alerts

Is there any way by which I can send nagios alerts to Amazon SNS ? I have tried with following steps, but its giving me this error in the Nagios log file: Jul 12 11:38:23 ip-10-134-13-204 nagios3: ...
2
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1answer
217 views

Hadoop - What is the purpose of the /usr/sbin/ shell scripts?

I am installing Hadoop 1.1.2 on CentOS 6.4. I read all the Hadoop documentation at http://hadoop.apache.org/docs/stable/ After installing, I noticed there are many shell scripts at /usr/sbin/. But ...