Thursday, September 24, 2015

Meet The GDELT project and Google BigQuery


In this post, i will talk out of DBA topics and introduce you The GDELT project . In short , it is an event database growing daily storing events captured from online news sites. What is magical that you can get data about how political events are related across unvierse and how online sources shows them. Give it a try at

Wednesday, September 23, 2015

Spark client configuration in a Custom Hadoop Client Environment


In this post, i will show how to communicate spark to a Hadoop Cluster located on Oracle BDA. Currently , in Cloudera Manager version CDH 5.4.0 spark client is not easily configurable . When you download client configuration and see spark related files are not relevant . After a huge effort (!) i managed to start spark-shell with preconfigured to target BDA environment.

Friday, September 11, 2015

[Validating SYS Password - OAUTH marshaling failure] during Upgrade to EM Cloud Control 12c R5


Recently my workmate faced with the following error [OAUTH marshaling failure] , when we upgrade OEM 12c R4 to R5. After some search we found out that it is about Java Options used by  Weblogic Server connection .

Wednesday, September 9, 2015

Custom Hadoop Client Configuration

Hi again,

In this post, i will show how to configure hadoop client on user machine and connecting them to different hadoop clusters. Also i will set client configurations on same machine targeting different Hadoop clusters. I am working on Oracle Big Data Appliance with Cloudera Manager 5.4.0.

It is very important for developers to access Prod and Test systems without changing development machines. For a hadoop developer, custom client configurations are important. In this post, i will connect developer to Prod and Test hadoop system and show you how to change connection target from test system to prod system within the environment.

Sunday, September 6, 2015

Establishing HUE LDAP integration and about ticketing filtering auditing issues


In this post , I am writing about how to enable LDAP authentication on HUE service via Cloudera Manager . When we add users in a commercial environment, it is a must to sync users with their existing account on the system. After that , i will show how to track user activities on our clustered system . Note that all configuration operations will be done on Cloudera Manager.

Thursday, September 3, 2015

Solving HUE-1711 [core] LDAP username import lowercase problem

Hi again,

In this post, i will write about username conflict when adding a user from LDAP on HUE via Cloudera Manager. Usernames are created maintaining case sensitive, but they are lowercase at OS. So people on working HUE can not access their files when logon from terminal. I show how to remove that problem.