BeanFactoryAware Interface in Spring Framework
If a class implements org.springframework.beans.factory.BeanFactoryAware interface, then the class bean is provided with a reference to their owning BeanFactory.BeanFactoryAware interface has a single...
View ArticleExcluding Bean From Autowiring in Spring
You can exclude a bean from autowiring at per-bean basis in Spring framework. If you are using Spring XML configuration then you can exclude a bean from autowiring by setting the autowire-candidate...
View ArticleJDBCTemplate with ResultSetExtractor Example in Spring
In the post Select Query Using JDBCTemplate in Spring Framework we have already seen an example of extracting data from ResultSet using RowMapper. A RowMapper is usually a simpler choice for ResultSet...
View ArticleBeanFactoryPostProcessor in Spring Framework
BeanFactoryPostProcessor interface in Spring resides in org.springframework.beans.factory.config package. BeanFactoryPostProcessor implementation is used to read the configuration metadata and...
View ArticleHow to Create Password Protected Zip File in Java
This post shows how to create a password protected zip file in Java and also how to unzip a password protected zip file in Java.Though Java provides an API (java.util.zip) for compressing and...
View ArticleBenefits, Disadvantages And Limitations of Autowiring in Spring
Though autowiring in Spring makes life easy by wiring the dependencies automatically thus requiring less code to write but at the same time autowiring has few limitations and disadvantages too and that...
View ArticleServiceLocatorFactoryBean in Spring Framework
ServiceLocatorFactoryBean in Spring framework as the name suggests is an implementation of service locator design pattern and helps with locating the service at run time.ServiceLocatorFactoryBean helps...
View Article@Import Annotation in Spring JavaConfig
If you are using JavaConfig in Spring to configure the bean definitions then, in order to modularize your configurations you can use @Import annotation.@Import annotation in Spring JavaConfig allows...
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Internationalization (i18n) Using MessageSource in Spring
In an interview if difference between BeanFactory and ApplicationContext is asked one of the reason to use ApplicationContext is given as the support for internationalization provided by...
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YARN in Hadoop
YARN (Yet Another Resource Negotiator) is the cluster resource management and job scheduling layer of Hadoop. YARN is introduced in Hadoop 2.x version to address the scalability issues in MRv1, it also...
View ArticleCapacity Scheduler in YARN
In the post YARN in Hadoop we have already seen that it is the scheduler component of the ResourceManager which is responsible for allocating resources to the running jobs. The scheduler component is...
View ArticleUber Mode in Hadoop
When a MapReduce job is submitted, ResourceManager launches the ApplicationMaster process (For MapReduce the ApplicationMaster is MRAppMaster) on a container. Then ApplicationMaster retrieves the...
View ArticleFair Scheduler in YARN
In the post YARN in Hadoop we have already seen that it is the scheduler component of the ResourceManager which is responsible for allocating resources to the running jobs. The scheduler component is...
View ArticleSpeculative Execution in Hadoop
Speculative execution in Hadoop is an option to run a duplicate map or reduce task for the same input data on an alternative node. This is done so that any slow running task doesn’t slow down the whole...
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MapReduce Flow in YARN
How a MapReduce job runs in YARN is different from how it used to run in MRv1. This post shows how MapReduce v2 runs internally in YARN Hadoop.Submitting the job First step is of course submitting the...
View ArticleData Compression in Hadoop
When we think about Hadoop, we think about very large files which are stored in HDFS and lots of data transfer among nodes in the Hadoop cluster while storing HDFS blocks or while running map reduce...
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Data Locality in Hadoop
In this post we’ll see what is data locality in Hadoop and how it helps in minimizing the network traffic and increases the overall throughput of the cluster.Data locality optimizationTo understand...
View ArticleWildcards in Java Generics
In Java generics there is also an option of giving question mark (?) as type which is called wildcard in generics. This question mark(?) represents an unknown type.The wildcard can be used in a variety...
View ArticleBounded Type Parameter in Java Generics
In the post generics in Java you would have already seen examples where type parameters are replaced by any class type. But there are times when you want to restrict the types that can be used as type...
View ArticleCompressing File in bzip2 Format in Hadoop - Java Program
This post shows how to compress an input file in bzip2 format in Hadoop. The Java program will read input file from the local file system and copy it to HDFS in compressed bzip2 format.Input file is...
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