CLOUDERA IMPALA

-
Now here is something that's really gonna change the way people thing about Hadoop. Hadoop was always criticized by the BI world as it does not integrate well with traditional business intelligence processes, as they say. The BI world has always felt that Hadoop lacks the capability of delivering real time. So, here is the answer for that. The biggest player of the Hadoop world (just a personal view), Cloudera, has recently launched a Real-Time Query Engine for Hadoop, and they call it as Impla. And the best part is that Cloudera has decided to distribute Impala under Apache's licence, which means another treat for open source lovers. Although, it is just the beta release, I think it's worth giving Impala a try. Cloudera is using the Strata + Hadoop World event in New York City to unveil Impala. As Cloudera claims Impala can process queries 10 to 30 times faster than Hive/MapReduce. (Sounds quite impressive)


Cloudera Impala provides fast, interactive SQL queries directly on your Apache Hadoop data stored in HDFS or HBase. In addition to using the same unified storage platform, Impala also uses the same metadata, SQL syntax (Hive SQL), ODBC driver and user interface (Hue Beeswax) as Apache Hive. This provides a familiar and unified platform for batch-oriented or real-time queries. Impala is an addition to tools available for querying big data. Impala does not replace the batch processing frameworks built on MapReduce such as Hive. Hive and other frameworks built on MapReduce are best suited for long running batch jobs, such as those involving batch processing of Extract, Transform, and Load (ETL) type jobs.


Cloudera Impala Diagram



The Impala solution is composed of the following components :
1. Impala State Store - The state store coordinates information about all instances of impalad running in your environment. This information is used to find data so the distributed resources can be used to respond to queries.
2.impalad - This process runs on datanodes and responds to queries from the Impala shell. impalad receives requests from the database connector layer and schedules the tasks for optimal execution. Intermittently, the impalad updates the Impala State Store of its name and address.

More about Impala can be found out at the Cloudera Imapala page.

Comments

Post a Comment

Popular posts from this blog

Fun with HBase shell

-
Image
HBase shell is great, specially while getting yourself familiar with HBase. It provides lots of useful shell commands using which you can perform trivial tasks like creating tables, putting some test data into it, scanning the whole table, fetching data from a specific row etc etc. Executing  help  on HBase shell will give you the list of all the HBase shell commands. If you need help on a specific command, type help "command" . For example, help "get" will give you a detailed explanation of the get command. But this post is not about the above said stuff. We will try to do something fun here. Something which is available, but less known. So, get ready, start your HBase daemons, open HBase shell and get your hands dirty. For those of us who are unaware, HBase shell is based on  JRuby , the Java Virtual Machine-based implementation of Ruby. More specifically, it uses the  Interactive Ruby Shell (IRB) , which is used to enter Ruby commands and get an immedia
Read more

BETWEEN OPERATOR IN HIVE

-
Hive is a wonderful tool for those who like to perform batch operations to process their large amounts of data residing on a Hadoop cluster and who are comparatively new to the NOSQL world. Not only it provides us warehousing capabilities on top of a Hadoop cluster, but also a superb SQL like interface which makes it very easy to use and makes our task execution more familiar. But, one thing which newbies like me always wanted to have is the support of BETWEEN operator in Hive. Since the release of version 0.9.0  earlier  this year, Hive provides us some new and very useful features. BETWEEN operator is one among those.
Read more

HOW TO SETUP AND CONFIGURE 'ssh' ON LINUX (UBUNTU)

-
SSH (Secure Shell) is a network protocol  secure data communication, remote shell services or command execution and other secure network services between two networked computers that it connects via a secure channel  over an insecure network. The ssh server runs on a machine (server) and ssh client runs on another machine (client). ssh has 2 main components : 1- ssh : T he command we use to connect to remote machines - the client.  2-  sshd : T he daemon that is running on the  server  and allows clients to connect to the server. ssh is pre-enabled on Linux, but in order to start sshd daemon , we need to install ssh first. Use this command to do that : $ sudo apt-get install ssh This will install ssh on your machine. In order to check if ssh is setup properly do this : $ which ssh It will throw this line on your terminal /usr/bin/ssh $ which sshd It will throw this line on your terminal /usr/bin/sshd SSH uses  public-key cryptography  to  authenticate  the remote co
Read more