Monday, September 19, 2016

[ElasticSearch] ElasticSearch Cluster Installation & memory problems

Hi everyone,

Today I will make my 1st post about ElasticSearch..

In this work, i will install ElasticSearch (Cluster) on 3 nodes and talk about memory problems we got during installation.

Unable to lock JVM memory (ENOMEM). This can result in part of the JVM being swapped out. Increase RLIMIT_MEMLOCK (ulimit).

ElasticSearch 1.7.1, Linux 6


Tuesday, September 13, 2016

[Big Data] First steps on Oracle Big Data SQL - helpful troubleshooting

Hi everyone,

In this post I will talk about usage of  Oracle Big Data SQL service on Exadata and some practices..

As we all know, using Oracle Big Data SQL, you can query data stored in a Hadoop cluster using from your Oracle database.

However, you need to take care of some problems related with Kerberos and some configuration issues with Exadata side.

Oracle BDS 3.0, BDA v4.5, Exadata 12c image


[Big Data - SPARK] Fixing environment problems when running spark-submit jobs from client ( Spark 1.6)


Hi everyone,

Today i will publish my first post about Apache Spark..

The problem I face is when we run a spark job from client machine or an edgenode, we get jars not found errors even if we create UberJar or classpath not founds errors.

In this post, I am gonna talk about how to set client environment in order to submit spark jobs succesfully and show how to debug a java process in detail..

Spark version : 1.6, CDH 5.7.1


[Big Data] About Cloudera Utilization Report

Hi everyone,

After a long post, I'm back :)

In this post, I am gonna talk about Cloudera new feature : Cloudera Utilization Report.. How to enable it on test cluster...

We can already have a look about cluster situation from charts or YARN pages , now starting with CDH 5.7 , we can have a detailed report for it.