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Jessica Qiu

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Latest Blogs from Jessica Qiu
As programming languages for data computing, both esProc and R language have rich functions to process text files. They have many similarities in basic usage, as well as obvious differences, such as in the aspect of processing files with fixed column width and big text files, reading a...
The MapReduce of Hadoop is a widely-used parallel computing framework. However, its code reuse mechanism is inconvenient, and it is quite cumbersome to pass parameters. Far different from our usual experience of calling the library function easily, I found both the coder and the caller...
The low efficiency of Hadoop computation is an undeniable truth. We believe, one of the major reasons is that the underlying computational structure of MapReduce for Hadoop is basically of the external memory computation. The external memory computation implements the data exchange thr...
An effort to solve data source preparation in reporting tool developing. Data sources cover the result set of SQL queries or stored procedures, and the 2D table from the text or Excel files. Owing to the technical competence or versioning, various reporting tools may only support a si...
In report development, it is the “computation” part and not the “presentation” part that brings about major difficulties. But reporting tool is weak in computation. The report developers as usual are more willing to compute in the report straightforwardly after retrieving data with SQL...
In the process of Java development, developers will come across data computation. But Java alone is not convenient to handle such computation. SQL has limited impact on improving the computational efficiency for Java. With Java alone it's difficult to handle such computations. Althoug...
In the process of report development, developers may need to handle data from multiple sources. But most of reporting tools only support single data source. Even the so-called reporting tools for multiple data source can only join 2 result sets roughly, and are also very inconvenient f...
The data computation layer of Java aims to reduce the coupling between these two layers and shift the computational workload from them. What are the features of the typical computation layer? What are the advantages and disadvantages of 5 data computation layers of Hibernate, esProc, ...
Why big data will fall into the pitfall of failure? It is because the current big data only provides the solution for data storage and query. It lacks a good solution for business analysis to enhance the competiveness, which is the most crucial.
In Java development, programmers may encounter the complex set operations. But Java is not capable enough to handle such computations. For this reason, programmers usually resort to dynamic calculation script for set operation. But SQL does not support the explicit set, and is unable t...
Computing on structured data is difficult to completed with Java. Then, how to implement the computation similar to database in Java conveniently? In the process of development with Java, we will occasionally encounter the computation similar to data processing in database. For instan...