Cloudera: All content tagged as Cloudera in NoSQL databases and polyglot persistence
Original title and link: Cloudera Announces Cloudera Developer Kit, Enabling Developers to Build Hadoop Apps Faster ( ©myNoSQL)
- support for
REFRESHfor a single table
- Hints for specifying particular join strategies
- Dynamic resource management, allowing high concurrency for Impala queries
Question: if I remember correctly Impala uses a single process on each machine to execute queries.
- is it multi-threaded?
- does it do any memory/CPU management so one query is not completely exhausting any of these resources?
- what happens with the queries executing when this process fails?
Original title and link: Cloudera Impala 1.0 Release Notes and A Couple of Questions ( ©myNoSQL)
The short answer is there is only one Apache Hadoop distribution.
The long answer is that there are many distributions that include Apache Hadoop or are claiming compatibility with Apache Hadoop.
The oldest and probably most popular: Cloudera’s Distribution of Hadoop (CDH)
The 100% open source: Hortonworks Data Platform.
The prioprietary: MapR.
The blue one: IBM InfoSphere BigInsights.
There’s also the version Facebook’s running on their cluster which includes Facebook Corona: a different approach to job scheduling and resource management.
But this list is not complete as it doesn’t include appliances featuring Hadoop. In this category we have:
- Oracle’s Big Data appliance featuring Cloudera’s Distribution of Hadoop
- Netapp’s Hadooplers
- EMC Greenplum DCA
- Teradata Aster Discovery Platform featuring Hortonworks’s Hadoop Data Platform
- Data Direct Networks (DDN)
I hope I didn’t miss any important ones1. As a conclusion for this list, my question is: who is actually benefiting from all these distributions?
I left aside for now Hadoop-as-a-Service. ↩
Original title and link: How Many Hadoops? ( ©myNoSQL)
Besides the well established Amazon Elastic MapReduce and Windows Azure HDInsight, there are two new Hadoop-in-the-cloud services:
- Skytap which offers Cloudera CDH4 Enterprise experimentation clusters up to 50 nodes
- Joyent Solution for Hadoop which is offered in partnership with Hortonworks. I hesitated for a bit to mention Joyent considering the page says “Sign up now to talk to a Joyent Solutions Architect” which is anything but a cloud service.
Original title and link: Hadoop in the Cloud: Skytap and Joyent ( ©myNoSQL)