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Automatic Testing of JavaScript Restrictor Project
Bednář, Martin ; Pluskal, Jan (referee) ; Polčák, Libor (advisor)
The aim of the thesis was to design, implement and evaluate the results of automatic tests for the JavaScript Restrictor project, which is being developed as a web browser extension. The tests are divided into three levels - unit, integration, and system. The Unit Tests verify the behavior of individual features, the Integration Tests verify the correct wrapping of browser API endpoints, and the System Tests check that the extension does not suppress the desired functionality of web pages. The System Tests are implemented for parallel execution in a distributed environment which has succeeded in achieving an almost directly proportional reduction in time with respect to the number of the tested nodes. The benefit of this work is detection of previously unknown errors in the JavaScript Restrictor extension and provision of the necessary information that allowed to fix some of the detected bugs.
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Network Traces Analysis Using Apache Spark
Béder, Michal ; Veselý, Vladimír (referee) ; Ryšavý, Ondřej (advisor)
The aim of this thesis is to show how to design and implement an application for network traces analysis using Apache Spark distributed system. Implementation can be divided into three parts - loading data from a distributed HDFS storage, supported network protocols analysis and distributed data processing. As a data visualization tool is used web-based notebook Apache Zeppelin. The resulting application is able to analyze individual packets as well as the entire flows. It supports JSON and pcap as input data formats. The goal of the application is to allow Big Data processing. The greatest impact on its performance has the input data format and allocation of the available cores.
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Distributed measurement of acoustic vibrations and temperature
Bukovský, Jan ; Záviška, Pavel (referee) ; Münster, Petr (advisor)
This work deals with the problem of vibration and temperature measurement using standard telecommunication optical fibers. The main focus of this work is on the measurement of these parameters with distributed acoustic sensing systems (DAS). In this work are also discussed the issues of vibration and temperature measurement with distributed strain and temperature sensing systems (DSTS), with distributed temperature sensing systems (DTS) and with interferometric systems. As part of this work, measurements were made in the laboratory with a commercial DAS system. During these measurements, vibrations and temperature changes around the fiber were simulated. Several methods of data processing have been proposed to evaluate the measured data. The proposed methods of data processing and evaluation of the measured data can be found in the last part of this work.
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Stability and Security of ZlomekFS
Záloha, Jan ; Babka, Vlastimil (advisor) ; Podzimek, Andrej (referee)
- english version ZlomekFS is a distributed filesystem which is able to share data among nodes. These nodes can cooperate in various modes. Modes differ in caching of local data at the client side and in the way how data is synchronized between the client and the server. This synchronization has been implemented by an unsecured and untrusted network connection until now. The current implementation uses FUSE interface for the communication between the kernel of the filesystem and the user. The synchronization is triggered when the user performs a specific operation above the filesystem. For well functionality in modern network environment it is necessary to both communicating partners to be sure about the identity of the second end of a communicating channel. This thesis implements trustworthy connection between the server and the client part of filesystem. In addition, it separates machine and user type of client. Next important part of the thesis is correct data synchronization and precise definition of sharing semantics.
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DCSN: Platform for Distributed Computing in Small Networks
Háva, Jakub ; Marek, Lukáš (advisor) ; Falt, Zbyněk (referee)
This thesis describes the platform for distributed computing in small networks. The platform should be very easy to use and suitable for deployment typically in one local network. The implementation follows the client-server architecture and the communication between client and server is based on Remote Method Invocation. The server is responsible for tasks distribution and other computation management. The client receives commands from a user, mediates communication with the server and is also used for the processing of tasks received from the server. The user submits a computation project consisting of two parts: a zip archive containing data files and a JAR archive containing a configuration file together with Java classes needed for the computation on the user data. The user is allowed to query the project state, pause, download or abort the project computation. Powered by TCPDF (www.tcpdf.org)
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History and Backup Support for zlomekFS
Wartiak, Rastislav ; Babka, Vlastimil (advisor) ; Obdržálek, David (referee)
zlomekFS is a distributed file system that supports disconnected operation using local cache. During synchronization of local changes it offers easyto-use conflict resolution mechanism. Further improved it became a file system with no specific kernel code. It has therefore a good potential in future public use. As the content of this file system can be updated by many users, keeping history of the changes can be a useful feature. This thesis implements file versioning in zlomekFS, answering the questions such as how to store and access the history. On top of the versioning, the possibility of consistent backup is introduced into the file system. New functionality is derived from the analysis of other file systems with similar features and selection of the most suitable approach for zlomekFS.
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Automatic Testing of JavaScript Restrictor Project
Bednář, Martin ; Pluskal, Jan (referee) ; Polčák, Libor (advisor)
The aim of the thesis was to design, implement and evaluate the results of automatic tests for the JavaScript Restrictor project, which is being developed as a web browser extension. The tests are divided into three levels - unit, integration, and system. The Unit Tests verify the behavior of individual features, the Integration Tests verify the correct wrapping of browser API endpoints, and the System Tests check that the extension does not suppress the desired functionality of web pages. The System Tests are implemented for parallel execution in a distributed environment which has succeeded in achieving an almost directly proportional reduction in time with respect to the number of the tested nodes. The benefit of this work is detection of previously unknown errors in the JavaScript Restrictor extension and provision of the necessary information that allowed to fix some of the detected bugs.
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Network Traces Analysis Using Apache Spark
Béder, Michal ; Veselý, Vladimír (referee) ; Ryšavý, Ondřej (advisor)
The aim of this thesis is to show how to design and implement an application for network traces analysis using Apache Spark distributed system. Implementation can be divided into three parts - loading data from a distributed HDFS storage, supported network protocols analysis and distributed data processing. As a data visualization tool is used web-based notebook Apache Zeppelin. The resulting application is able to analyze individual packets as well as the entire flows. It supports JSON and pcap as input data formats. The goal of the application is to allow Big Data processing. The greatest impact on its performance has the input data format and allocation of the available cores.
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Assessing Usability of Raspberry Pi for Distributed Computing
Stefan, Petr ; Kruliš, Martin (advisor) ; Jančík, Pavel (referee)
The main objective of the presented work is to assess performance of Raspberry Pi micro- computer and its applicability as a work node of a computational cluster. The thesis conta- ins implementation of set of tests that evaluate the CPU performance as well as the throu- ghput of operation memory, persistent storage (SD card), and Ethernet network adapter. The results of comparison of empirical results obtained from Raspberry Pi and representa- tives of regular computers provided basis for recommendation, whether a construction of Raspberry Pi cluster is feasible. Furthermore, the results allowed us to make an estimation of economical and performance aspects of the solution. 1
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Distributed video compression in the peer to peer networks
Hudeček, Vojtěch ; Steinhauser, Antonín (advisor) ; Jiráček, Zbyněk (referee)
Despite today's computers' performance there still exist some tasks that are quite time demanding. Nature of some of these tasks allows to split them into smaller parts that can be processed in parallel. Distributing work among more computers in order to speed up such processes is a common technique. However, most of the approaches use client-server architecture to achieve this goal. We provide purely peer-to-peer solution which allows high level of scalability, error recovery and easy maintaining. No special role is needed in our framework and each node can join the network at any time. Also the system is able to deal with node failures, keeping the overall computation time reasonable. Tests showed that significant improvement can be achieved in local area networks. 1
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