Arun Vasu

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since Oct 05, 2010
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Recent posts by Arun Vasu

Verify the read/write privilege of the jar file
5 years ago
Hi,

I have come across with a use case to access the redo log and parse it to extract the change data of a particular table. Is there any programmatic way in Java or any other programming language to do it?
I came to know that Oracle supplies Log Miner tool. It will be great if anyone could shed some light on how to use this tool from Java.

The data base I use is : Oracle 11g Enterprise edition.

Any help is greatly appreciated.

Thanks,
Arun
5 years ago
Thanks Tim, this is what I was looking for
5 years ago
Hi All,
I am very new to Spring 3 technology. My project requirement is to inject a property file in Spring 3. The intention is to load a property file into a

java.util.Properties

member variable using annotation.
Could somebody help me to achieve it?

Thanks in advance
Arun
5 years ago
Make sure you have given proper entries in /etc/hosts file in the form of "ip address<tab>host_name".
Edit /etc/sysconfig/network and change the HOSTNAME= line to reflect your machine’s name. And your machine has an internet connection.

These are the only necessary network configuration you needs.
6 years ago
CCAH is a good option. Get more info on CDH
6 years ago
In Hive, you cannot do randome read/ update. HBase supports that. A lot more also.
Please see the tutorial @ Hadoop: Defenitive Guide v3
6 years ago
Yes, you can try a cluster on single machine. The good way to try out this is by using virtual machines.
I have tried it with VM of Centos O/S. The configuration I tried on my Windows 7 system is

Hardware: 4 gb ram @ 1600mhz, Interl i5 processor and 5400 prm hdd.

Software: Cloudera cdhv3, VMWare player v5, the virtual machine files for Centos O/S

Hadoop configuration: One Master node( Holds namenode, secondary name node and jobtracker), Three slave nodes (runs datanode and tasktracker on each)

This set up will help you to learn all the aspects of Hadoop technology.

Share if you find any difficuilties to try out it, am happy to help you!
6 years ago
The best practise is to keep the number of redulers slightly less than the number of available reduce slots in your cluster.
Get more info from Hadoop wiki
6 years ago
Hi All,

I have an issue with XML conversion to java using JAXB. The scenario is,

I have to parse a huge xml file to java objects. The xml will hold 30000 complex types with each one holds about 20 string elements. While parsing, it is taking 4 minutes to convert it in to java.

Could somebody show me some light to reduce the time taken for this conversion ?

Thanks in advance,
Arun
Hi,

I want to write JUnit testcases for an EJB method. My web application structure is give below.

Struts DispatchAction->Delegate->EJB->Hibernate DAO

I would like to write unit test cases from the EJB level.
Could somebody help me to find a way to accomplish this?

Thanks,
Arun
7 years ago
Hi,

I wrote a test program to start learning Struts. Please see the code below.

Action Class:

Form Class:


web.xml:



struts-config.xml


index.jsp:



When I try the URL http://localhost:8080/StrutsExample1/index.jsp, my success page is not getting invoked.

I am using Tomcat 6 with MyEclipse 6.6 . The JDK version is 1.5.

Could somebody show me what went wrong with my configuration?

Thanks,
Arun
7 years ago
Hi All,
I have an issue in rendering a jsp page in another jsp page for IE8 browser.

I am using tiles insert tag[ ] to include the child jsp page in the parent page. The parent page holds a header with a heading text, the tile insert tag for child jsp page, two images in a div and the footer below to the inserted page.

Usually the child jsp page will contain a big chunk of data and take some time to render in the browser. In IE7, the bottom placed images will be shown only when the child page is fully rendered, but in IE8 it is not happening. Instead, the parent page is rendered fully before the child jsp page is getting fully rendered in browser.

Could somebody know why this strange behaviour is happening in IE8 browser.

Thanks,
Arun Vasu
7 years ago