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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641 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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3answers
676 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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0answers
31 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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0answers
201 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
3k 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
258 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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0answers
678 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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0answers
77 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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2answers
193 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
447 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
233 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
166 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
393 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
49 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
1k 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
795 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
54 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
2k 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
40 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 ...
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1answer
167 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: ...
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2answers
3k 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 ...
5
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1answer
6k 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
29 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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0answers
487 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: ...
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1answer
383 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 ...
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2answers
2k views

how do I install pdsh on centos 6? [closed]

I'm following a tutorial on how to configure a centos machine to be a node in a hadoop cluster for HortonWorks. I'm doing this on a virtual machine on VirtualBox. Sadly, since I am a linux beginner, ...
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3answers
741 views

Hadoop - /usr/bin/hadoop: line 320: /usr/bin/java/bin/java: Not a directory

I am installing Hadoop on CentOS 6.4. Following these instructions http://hadoop.apache.org/docs/stable/single_node_setup.html wget ...
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1answer
54 views

How do I reconfigure the default port or uninstall the interactive Javascript console in HDInsight?

The Microsoft HDInsight Preview is available for download and install via the Web Platform Installer, which bundles Hadoop on Azure installer. As part of the process, it installs something that ...
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2answers
486 views

ext4 on faulty disks. How to avoid remount read-only?

The Problem: I'm in charge for a Hadoop cluster of 44 nodes. We have 1.5TB WD Green Drives with (quite unknown) the Load Cycle Count problem. These disks work fine but as they get older they show an ...
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1answer
630 views

Unable to read S3 file from interactive pig job flow

I'm unable to read a simple test file on S3 from an interactive pig job flow (hadoop, elastic map reduce), and I'm not sure why. I have two S3 buckets. Let's call them unmounted_bucket, and ...
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1answer
80 views

installing and configuring hadoop on ubuntu

I'm unable to locate the file hadoop-ec2-env.sh. I've downloaded and intalled hadoop_1.0.4-1_x86_64.deb from http://mirror.olnevhost.net/pub/apache/hadoop/common/stable/ This is the most recent ...
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1answer
368 views

setting up environment variables for aws hadoop ec2

I've been following this book: Hadoop in Action It gives a nice guide on how to start using ec2 with hadoop. One of the first things that it says is to download the command line tools here: ...
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1answer
120 views

Hadoop: Slave nodes are not starting

I am trying to setup a Pseudo Distributed Hadoop Cluster on my machine. Env Details : Host OS: Windows Guest OS: Ubuntu Vm's Created one master and one slave. I was able to run the hadoop ...
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1answer
6k views

How do do this in apt.conf - Acquire::http::Proxy “http://server:port/”;

Below are the instruction I have to follow for setting up cloudera. I am confused about the below on ubuntu 12.04. On Debian/Ubuntu systems, add the following property to /etc/apt/apt.conf: ...
9
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4answers
3k views

DIY Hadoop Cluster - Heat & Dust issues?

Following are links of my DIY 6-Node Hadoop Cluster using i3 Machines, What is the best possible way to protect my design from dust & provide better heat transfer? What should I use to cover ...
0
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1answer
61 views

Getting exposure to big data without having to set up the environment [closed]

Is anyone aware of any sandbox where an environment is already set up for big data processing? It can be hadoop, cassandra, pig etc... I'm a sql server programmer, and trying to get into big ...
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0answers
110 views

Cannot access data from hbase with amazone ec2

I have a single node Hadoop machine in which HBase is running in the Amazon EC2 instance. Due to some reason the server got restarted. So i need to start Hadoop and Hbase again. Then it's working ...
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1answer
201 views

MapReduce job is hung after 1 of 5 reducers completed on single-node environment

I have only one Data Node on my dev environment on EC2. I ran heavy MR job and in 6 hours noticed that 100% of mappers and 20% of reducers finished (1 of reducer shows 100% competition, other ones - ...
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1answer
278 views

Java process failure (hadoop, hbase)

Anytime I am running hadoop/hbase process from a command prompt I get an error: /usr/local/hadoop/bin/hadoop: line 320: /usr/lib/jvm/jdk1.7.0/bin/java: cannot execute binary file ...
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1answer
202 views

hadoop: port appears open locally but not remotelly

I am new to linux and hadoop and I am having the same issue as in this question. I think I understand what is causing it but I don't know how to solve it (Don't know what they mean by "Edit the ...
1
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1answer
178 views

Programmatically configure Hadoop cluster from python

Are there any python API's to configure a hadoop cluster (namenode, jobtracker, etc..)setup on an OpenStack cloud?? I have the IP addresss to the VM's and am looking for openstack api's to configure ...
0
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1answer
181 views

Hadoop hardware disk choice [closed]

We're evaluating the options of setting up a large hadoop cluster. Now we actually have the choice to choose from these 3 setups: 300x server with 12x 1TB disk 150x server with 12x 2TB disk 100x ...
1
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1answer
88 views

Data lost after Hdfs client was killed

I wrote a simple tool to upload logs to HDFS. And I found some curious phenomenon. If I run the tool in foreground and close it with "Ctrl - C", there will be some data in HDFS. If I run the tool in ...
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1answer
1k views

Hadoop hdfs namenode is throwing an error

Full list of error: hb@localhost:/etc/hadoop/conf$ sudo service hadoop-hdfs-namenode start * Starting Hadoop namenode: starting namenode, logging to ...
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2answers
3k views

How does hadoop decide what its nodes hostnames are?

Currently the urls generated by the jobtracker & namenode return either hostnames like bubbles.local or just bubbles. These end up not resolving unless the client machine has specified these in ...
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1answer
497 views

Implications of Multiple JobTracker nodes in a Hadoop cluster?

I get the impression that one can, potentially, have multiple JobTracker nodes configured to share the same set of MR (TaskTracker) nodes. I know that, conventionally, all the nodes in a Hadoop ...
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3answers
531 views

Hadoop ecosystem web dashboard

I am trying to find a tool, which would show me an overview of my Hadoop ecosystem - state, health, running tasks, etc. I tried to Google, but did not find any. Is there some nice useful tool?
3
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1answer
8k views

Can't connect to HDFS in pseudo-distributed mode

I followed the instructions here for installing hadoop in pseudo-distributed mode. However, I'm having trouble connecting to HDFS. When I execute this command : ./hadoop fs -ls / I get a ...
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2answers
1k views

Kernel panic - not syncing - Attempted to kill init

I am using Linux 2.6.32-33-server #70-Ubuntu 10.04.3 as Data-Nodes and Name-Node in my Hadoop cluster, but one of my data node is down since morning. When i restarted that particular system it ...
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1answer
75 views

Monitoring tools for non-distro Hadoop

I've built a Hadoop cluster by installing most packages manually (using binaries or source). I opted not to use a custom distribution like Cloudera, MapR or Hortonworks, since I wanted the flexibility ...