Big Industries, Cloudera systems integration and reseller partner for Belgium and Luxembourg, has developed an integration of Apache Mesos and CDH that can be deployed and managed through Cloudera Manager. Why would you want to run things like web servers, proxies, and caches on a Hadoop cluster, though? For example, building a security information and event management (SIEM) solution on top of Hadoop means including a live-traffic inspection layer as well as an active archive of security-related event logs and reporting tools. Mesos comes with a framework called Marathon to launch tasks on the cluster, and a scheduler framework called Chronos, which offers a highly available, fault-tolerant alternative to Unix cron. In order to launch an application, Mesos Marathon uses Docker, an application virtualization system that enables portable, standardized and containerized deployment of applications and components across the cluster. There are other ways to launch applications on Mesos, but Docker offers a robust solution with extensive features. The next step is to download, distribute, and activate the Mesos and Docker parcels via Cloudera Manager. We can now set up and configure a new Mesos service on our cluster from Cloudera Manager, in the same way we would set up any other Hadoop service. You can choose which nodes of the cluster to use as Mesos slaves, Mesos masters, and where to deploy the Marathon service. The best way to do this is to provide a Docker Registry, which is comparable to a Git-repository for Docker images.
Note that when using an insecure private registry, like the one from the JSON file, it is important to add the –insecure-registry argument to the start command. Make sure the IP address and the port number of the registry are set correctly and the registry is added as insecure registry on the Docker daemon.
In this article we have explained some of the features and benefits of Apache Mesos, seen how to deploy Mesos and Docker under CDH using Cloudera Manager and custom parcels, and had a look at launching an application component (Memcached) across the cluster using Mesos Marathon. The source code for the Cloudera Manager Mesos and Docker extensions is available on github and its Apache v2 licensed.
Rob Gibbon is architect, manager, and partner at Big Industries, the industry-leading Hadoop SI partner for Belgium and Luxembourg. Via a combination of beta functionality in CDH 5.5 and new Cloudera Labs packages, you now have access to Apache HTrace for doing performance tracing of your HDFS-based applications.
HTrace is a new Apache incubator project that provides a bird’s-eye view of the performance of a distributed system. Processes like the NameNode, DataNode, and filesystem clients generate trace spans based on the work they’ve done.
The first thing you have to do to get started with HTrace is to install htraced, which Cloudera is making available today in the form of a Cloudera Labs package. Once htraced is installed, you should be able to log into any host and type the following to get the installed version of htraced. On the node where you want to run htraced, create several storage directories and make sure they are owned by the htrace user.
Once htraced is running, the next step is to configure your HDFS daemons and clients to send trace spans to htraced.
The configuration above will trace a random sample of all the requests flowing through the HDFS client.
Once the configuration has been deployed, you can use the hadoop trace tool to verify that HTrace is enabled on the daemons. Sometimes, the hadoop trace command will show that you have no span receivers even though you have applied the configuration above.
Check to make sure that your core-site.xml configuration files include the htrace configuration. Now that we have HTrace installed, you should be able to see the htraced daemon running within Cloudera Manager.
If you have a larger cluster, you will want to turn down the sampling rate to avoid sending too many spans to htraced. If the sampling rate is too high, clients may drop spans because they are unable to send them to htraced as fast as they are generated. With the addition of HTrace to CDH 5.5 and the availability of htraced via Cloudera Labs, you now have a powerful tool for analyzing cluster-wide performance. For more details about the HTrace architecture, check out the talks about it at ApacheCon, and the upstream developer mailing list.
I did some research and I found this excellent video on YouTube presenting a step by step explanation on how to setup a cluster with VMware and Cloudera. Perform changes in the following files to setup the network configuration that will allow all cluster nodes to interact. Download and run the Cloudera Manager Installer, which will simplify greatly the rest of the installation and setup process. Once this is done, you will select additional service components; just select everything by default.
Now that we have an operational Hadoop cluster, there are two main interfaces that you will use to operate the cluster: Cloudera Manager and Hue. I have been able to create a small Hadoop cluster in probably less than a hour, largely thanks to the Cloudera Manager Installer, which simplifies the installation to the simplest of operation.
Alternatively, users can investigate using lxc on their virtualbox to create lightweight VMs. If this host gateway is my physical computer, how I can configure it to use it as gateway in virtual cluster?
If this host gateway is special virtual machine – can you give me the link, how I must configure it? In this post, Big Industries’ Rob Gibbon explains the benefits of deploying Mesos on your cluster and walks you through the process of setting it up.
Well, when assembling a technical solution, especially an off-the-shelf solution, it is common that the buyer expects the vendor to provide a complete, ready to go platform, with a single bill-of-materials. While Hadoop perfectly fits the needs for the active archiving element, without Mesos integration to run a live-traffic inspection system and a reporting server, it would be quite difficult to deliver on the complete system requirements in a consistent way from a single platform. The engineer writes a dockerfile, which is a text file containing a set of automation instructions for deploying and configuring the application.


With this approach, deploying Mesos and Docker is a similar experience to deploying other Hadoop components like YARN, Impala, or Hive.
Due to the increased workload we want to make sure that performance and availability of Hive is not compromised. Akin to NetFlixOSS Eureka it enables microservices discovery, lookup and registration.Docker is an open source container technology that became immensely popular in 2014.
At the core of my role, I provided direct support to my colleagues in guiding job applicants through our hiring process.
While log files can provide a peek into important events on a specific node, and metrics can answer questions about aggregate performance, HTrace can follow specific requests all the way through the cluster.
Periodically, they send these trace spans to a span receiver such as htraced for storage and indexing. The htraced daemon has a graphical user interface for examining trace spans sent by many services running on many different hosts.
Currently, only HDFS tracing is enabled, but integration with other components is coming soon.
Then install the package using your operating system’s package tool, such as rpm on Red Hat or dpkg on Ubuntu. You should be able to tell which host is the Cloudera Manager server process since it is the host that exposes the Cloudera Manager web interface.
You can use the hdfs getconf command to verify that the client configuration has been deployed to all nodes. Here you can check the total number of spans that were ingested, as well as how many were sent from each host in the cluster.
Initially, I used Cloudera’s pre-built virtual machine with its full Apache Hadoop suite pre-configured (called Cloudera QuickStart VM), and gave it a try. I adapted this tutorial to use VirtualBox instead, and this article describes the steps used. We create a virtual machine, we configure it with the required parameters and settings to act as a cluster node (specially the network settings). The first node, which will run most of the cluster services, requires more memory (8GB) than the other 3 nodes (2GB). Uncomment the following line and change the value to no; this will prevent the question when connecting with SSH to the host. Most of the roles will be installed on this node, and therefore it is important that it have sufficient memory available.
It is now possible to execute and use the various examples installed on the cluster, as well as understand the interactions between the nodes. This redues the memory requirements significantly – to the sum of all Java processes, no operating system overheads. The range of IP addresses you will be using should be in the range of actual platform you are running VirtualBox on: and you should be specifying the same gateway to your router that goes to the internet to get all those packages. A very minor point would be that you need to pull off the ssh private key onto the main host so that the web browser can pick it up. Mesos is designed to scale, like YARN is, and Mesos services can be deployed on clusters of up to 10,000s of nodes. Solutions often make use of operational, front-end serving components (reverse proxies, load balancers, web servers, application servers) and middle-tier components (object caches, JMS, workflow engine etc.) in addition to backend components and while Hadoop is great at solving backend data processing challenges, until Mesos it has been pretty difficult to deploy and operate front-end and middle tier components in a consistent manner as part of a complete, Hadoop-powered solution. In order to ensure solid resource isolation, you can use Cloudera Manager’s Linux Control Groups integration to allocate appropriate system resource shares to the Mesos framework; this way Mesos and other Hadoop components like YARN and Impala can coexist.
I also had the opportunity to take on and create small projects for myself during my four months there.Since our past technical CO-OPs have written fantastic blogs about their experiences at Pythian (be sure to read them!), how about I write this one about the business side of working there? I know you like feeling like you’re in charge, but really you’re not in charge of all the rules you have to follow while you’re inputting your data. The presentation talks about the type of challenges on how to scale an application horizontally via Oracle RAC.
Since htraced uses native code, be sure to download the right package for your operating system. Note that you must re-install HTrace when you upgrade CDH, since the CDH upgrade will remove the htraced jar. By default, the htraced web interface will be on port 9096 on the host where htraced was installed. This is a good way to make sure that all your hosts are configured to send spans to htraced.
You can also see how many total spans have been sent on this page, and use it to get a rough idea of how many spans per minute are being sent. This referenced virtual machine is then cloned as many times as there will be nodes in the Hadoop cluster. Overall we will allocate 14GB of memory, so ensure that the host machine has sufficient memory, otherwise this will impact your experience negatively. Other people—like the designers of the machine you’re using—have made certain rules that you have to live by.
Red Hat Linux 6 and greater, Ubuntu 12.04 and greater, and other popular Linux distributions are supported.
In the configuration above, ProbabilitySampler will create a trace span when a random number between 0 and 1 is less than 0.001, or for approximately 1 in 1000 requests. If you have installed the CDH parcel to a non-default location, you will have to create the symlink manually.
The QuickStart VM is fully functional and you can test many Hadoop services, even though it is running as a single-node cluster.
Only a limited set of changes are then needed to finalize the node to be operational (only the hostname and IP address need to be defined). What better place is there to develop cross-cultural literacy?With Pythian, I had the pleasure of working with remote and international colleagues for the first time. Top that with actively communicating with a global pool of job applicants on a daily basis. If you want a ‘B’ to appear in the input, then you have to reach over there and push the ‘B’ key on the keyboard.In addition to the rules imposed upon you by the designers of the machine you’re using, you follow other rules, too. Usually you should remove it once you have examined the contents, so that new messages can be seen if they occur.


You can then used the root password (or the SSH keys you have generated) to automate the connectivty to the different nodes. Hiveserver2For the sake of simplicity this blog will focus on enabling HA for the Hive Metastore Server and HiveServer2. Succeeding in this kind of environment definitely requires you to be cross-culturally literate, which means that you understand how cultural differences—both inside and outside an organization—affect a business’s day-to-day practices.In business school, we are often reminded about the importance of considering the external environment when a firm goes global (CDSTEP, anyone?), so it was quite eye-opening to see how my experience at Pythian really validated my studies. If you’re writing a computer program, then you have to follow the syntax rules of the language you’re using. We recommend that the underlying Hive Metastore underlying RDBMS be configured for High Availability and we have configured multiple Zookeeper instances on the current cluster.Enabling High Availability for Hive Metastore Server1. For example, processes that are of no legal concern in Canada might present a huge obstacle when hiring abroad, and pieces of information that North Americans prefer to keep private are quite openly discussed in other cultures. There are alphabet and spelling and grammar rules for writing in German, and different ones for English.
Talking to candidates from around the world definitely taught me how to think more critically about my communication—not only in terms of what I say, but also how I say it.2. It feels nice not to be just “the CO-OP student”.Upon my first day, I immediately felt that I would not be looked at as simply an intern. A typewriter is a machine that used rods and springs and other mechanical elements to press metal dies with backwards letter shapes engraved onto them through an inked ribbon onto a piece of paper. My team greeted me with open arms (already knowing my name!) and repeatedly emphasized the value of having me on board throughout my term.
Within days, I could already understand the significance of my tasks and how they contributed not only to the team, but also to the organization as a whole.Another great thing about not being just “the CO-OP student” is empowerment.
Just like you wouldn’t press the ‘A’ key to make a ‘B’, you wouldn’t use the strings “definately” or “we was” to make an English sentence.On your typewriter, you might not have realized it, but you did adhere to some typography rules.
During my term, my team enthusiastically invited me to explore our work processes and offer ideas to make things better.
Such typography rules can vary from one project to another.Most people who didn’t write for different publishers got by just fine on the one set of typography rules they learned in high school. If you run a quick Google search, you will find many studies showing that Millennials are not as comfortable with making phone calls as their predecessors were—and I could speak to that, 100 percent! Most people had never even heard of a lot of the rules they should have been following, like rules about widows and orphans.In the early 1980s, I began using computers for most of my work. Now there were rules about “control keys” like ^X and ^Y, and there were no-break spaces and styles and leading and kerning and ligatures and all sorts of new things I had never had to think about before.
I’ll ignore the receptionist’s voicemails until she sends me an e-mail (although my telephonophobia might not be the only reason for that one!).My colleagues helped me overcome this discomfort by having me conduct reference checks. As embarrassing as it might sound, I actually had to take the greatest leap of faith to get my fingers dialling for the first time. Choose multiple Hosts (at least 2 more to make a total of 3) to configure Hive Metastore Server on.Click OK and Continue. Although I certainly had a mini heart-attack whenever I was asked to help with a reference, I eventually eased into the task with time. But word processors revealed that typesetting was way more complicated than just typing.Doing your own typesetting can be kind of like doing your own oil changes. While I might still shy away from the telephone now and then, I really do feel accomplished in getting more comfortable with using less texting and more talking!All in all, my experience at Pythian has been nothing less than fantastic.
Most people prefer to just put gas in the tank and not think too much about the esoteric features of their car (like their tires or their turn signal indicators).
It has truly been a pleasure to work with a diverse group of people from around the world, and I would be thrilled to see my future take me back there one day. You should now see new hosts added as the Hive Metastore Server.Click on Restart the service (or the instance) for the changes to take effect. If you’re looking to intern for a company with a global focus and an information-sharing, empowering culture, then you would definitely love to join Pythian! Using TeX was my first real exposure to the world of actual professional-grade typography, and I have enjoyed thinking about typography ever since. It’s the tiniest little tip of the typography iceberg, but it opens the conversation about typography, for which I’m glad. The next time I type on an actual typewriter, I will use two spaces after each sentence-ending period. I will also use two spaces when I create a Courier font court document or something that I want to look like it was created in the 1930s.
When I use my iPhone, I’ll tap in two spaces at the end of a sentence, because it automatically replaces them with a period and a single space. I adapt to the rules that govern the situation I’m in.It’s not that the rules have changed. The following is the recommended plan for testing the High Availability of Hive MetaStore.1.
Issue Show databases command in the beeline shell of step 1.This command should fail which is normal.
Instead of connecting to a specific HiveServer2 directly, clients connect to Zookeeper which returns a randomly selected registered HiveServer2 instance.1.
Choose multiple Hosts (at least 2 more to make a total of 3) to configure HiveServer2 on.Click OK and Continue.
You should now see new hosts added as HiveServer2.Choose the newly added instances and Choose Start. Stop the second HiveServer2 in the list Connection to Beeline using command below should still work normally.3.



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