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Elasticsearch : What, How and Why?
At its core, you can think of Elasticsearch as a server that can process JSON requests and give you back JSON data in near real-time.
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SQOOP : Data transfer between Hadoop and RDBMS
Apache Sqoop is a tool designed for efficiently transferring bulk data between Apache Hadoop and relational databases or mainframes.
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Generate Sequential and Unique IDs in a Spark Dataframe
Apache Spark is an open source, general-purpose distributed computing engine used for processing and analyzing a large amount of data. Hence, adding sequential and unique IDs to a Spark Dataframe is not very straight forward, because of distributed nature of it.
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Locking in Hibernate using Java
In a relational database, locking refers to actions taken to prevent data from changing between the time it is read and the time is used.
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curl – Unix, Linux Command with examples
The curl is a command line tool used to download or upload data to a server via supported protocols such as HTTP, FTP, IMAP, SFTP, TFTP, IMAP, POP3, SCP, etc. It is a remote utility, so it works without user interaction.
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