Apache Spark has recently become the most popular big data analytics framework. Default configurations are provided by Spark. HDFS stands for Hadoop Distributed File System. It means large files will be physically stored on multiple nodes in a distributed fashion. The block size determines how distributed, while replication factor reliable are. If there is just one copy of each given file and n...

Much has been said in praise of self-adjusting data structures, particularly self-adjusting binary search trees. Self-adjusting trees are most suited to skewed key-access distributions as the techniques attempt to place the most commonly accessed keys near the root of the tree. Theoretical bounds on worst-case and amortized performance (i.e. performance over a sequence of operations) have been ...

This paper proposes a novel decoupling technique achieved by adjusting the position of feeding probes antennas. Two inherent radiation modes (patch mode and monopole mode), with different patterns polarizations, are simultaneously excited same probe. High isolation is realized based on manipulating relationship two-mode couplings moving positions. Since two generated antenna element, proposed M...