Sheer increase in volume of data over the last decade has triggered research in cluster computing frameworks that enable web enterprises to extract big insights from big data. While Apache Spark is gaining popularity for exhibiting superior scale-out performance on the commodity machines, the impact of data volume on the performance of Spark based data analytics in scale-up configuration is not...

Recently, Spark as data processing engine, gained huge popularity because of better performance in terms of the speed. Developers of Spark claim that it may outperform Hadoop MapReduce in 100 times in memory and 10 times on disk [1]. This paper outlines which innovations improved speed and how. In order to investigate improvements, I analysed technical documentation, which is available, since b...

Spark [6] is a cluster framework that performs in-memory computing, with the goal of outperforming disk-based engines like Hadoop [2]. As with other distributed data processing platforms, it is common to collect data in a manyto-many fashion, a stage traditionally known as the shuffle phase. In Spark, many sources of inefficiency exist in the shuffle phase that, once addressed, potentially prom...

Lean-burn is an attractive concept for reasons of high thermal efficiency and low nitrogen oxide (NOx) emissions, however, successful implementation in spark-ignition (SI) engines turned out to be challenging because misfire or partial burn caused by attenuated flame propagation. In order overcome this issue, microwave-assisted plasma ignition system (MAPIS) has been applied combustion systems....

introduction: video-assisted clinical instruction (vacid) has been found to be a beneficial teaching tool for various fields in dentistry. the aim of this interventional study was to compare the efficacy of live conventional demonstration (cd), video teaching, and vacid (video with explanation) methods in teaching of root canal treatment to undergraduate dental students. methods and materials: ...

the micro wire electrical discharge machining (micro wire-edm) process is a modern machining process with various applications in manufacturing micro-parts. the recast layer remaining on the machined surfaces is an inevitable complication of this process. this layer can subsequently affect the machined parts performance. to optimize the recast layer in the micro wire-edm of the molybdenum micro...

The spark energy transferred under the highly stratified conditions during late injection in a spray-guided spark-ignition direct-injection (SG-SIDI) engine is not well characterized. The impact of high pressures, temperatures, velocities, and variations in local fuel concentration along with temporal and/or spatial variations on spark performance must be better characterized. Previous spark ig...