big-data   3490

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数据中台
airflow + ETL + MPP SQL DB + redash/superset
big-data 
3 days ago by FTS
Big Data Surveillance: The Case of Policing - Sarah Brayne, 2017
Tracks the intertwined growth of surveillance and "big data" within the Los Angeles Police Department through interviews and observation. Identifies five areas of transformation:

1. discretionary risk assessments -> quantified risk assessment: data that is input to these assessments includes the results of "field interviews," creating a feedback loop since "high risk" individuals are stopped for interviews more frequently, but each police contact adds to a person's risk score

2. reactive/explanatory analysis -> predictive analysis (e.g. PredPol)

3. query-based -> alert-based systems: the main example here is Palantir, which allows you to set alerts based on individuals, locations, or other characteristics present in real-time (often high-frequency) databases. Queries themselves become data, as the fact that someone has been searched by other officers using the system can itself be flagged

4. lower database inclusion thresholds: law enforcement databases have expanded beyond individuals who have direct contact with police through arrests or stops -- they now include data collected during stop-and-frisk and risk-based field interviews, the field interview data can include information on who else was with the person of interest even though they did not have any direct police contact, automated license plate readers (ALPR) suck up data constantly

5. integration of different data systems -- merging data across data stores and creating unique identifiers across systems, which governments might be interested in for the purpose of improving service delivery, also transforms the nature of surveillance -- interviewees rave about their Palantir software which lets them see everything in one place. In addition to data from public agencies including law enforcement, social services, health/mental health services, child/family services, the paper also mentions Palantir's constant inclusion of new data sources -- repossession/collections agencies, social media, foreclosure, electronic toll data, utility bills, pay parking lots, fast food call data, university camera feeds, rebate data . . . "In some instances, it is simply eaasier for law enforcement to purchase privately collected data than to rely on in-house data because there are fewer constitutional protections . . .". Much of the newly integrated data suffers from related types of inclusion bias (e.g. your chances of appearing in stop-and-frisk data differs based on race and class, this is also true for usage of social health/family services, etc., and even the placement and usage of ALPRs is based on measured crime rates), so that in all, these systems come to define and mark a population as suspicious (the only responses to queries will be people already in the data in some way).
surveillance  machine-learning  big-data  police  police-data  palantir  lapd  los-angeles 
5 days ago by tarakc02
Fast generalised linear models by database sampling and one-step polishing: Journal of Computational and Graphical Statistics: Vol 0, No ja
"In this note, I show how to fit a generalised linear model to N observations on p variables stored in a relational database, using one sampling query and one aggregation query, as long as N12+δ observations can be stored in memory, for some δ>0. The resulting estimator is fully efficient and asymptotically equivalent to the maximum likelihood estimator, and so its variance can be estimated from the Fisher information in the usual way. A proof-of-concept implementation uses R with MonetDB and with SQLite, and could easily be adapted to other popular databases. I illustrate the approach with examples of taxi-trip data in New York City and factors related to car colour in New Zealand."
glm  big-data  fisher-scoring  R  dbglm 
7 days ago by arsyed
Kedro - Python library for building robust production-ready data and analytics pipelines
A workflow development tool that helps you build data pipelines that are robust, scalable, deployable, reproducible and versioned.
Python  big-data  machine-learning  opensource  workflow 
7 days ago by liqweed
Apache Hadoop 2.9.2 – HDFS Architecture
The Hadoop Distributed File System (HDFS) is a distributed file system designed to run on commodity hardware. It has many similarities with existing distributed file systems. However, the differences from other distributed file systems are significant. HDFS is highly fault-tolerant and is designed to be deployed on low-cost hardware. HDFS provides high throughput access to application data and is suitable for applications that have large data sets. HDFS relaxes a few POSIX requirements to enable streaming access to file system data. HDFS was originally built as infrastructure for the Apache Nutch web search engine project. HDFS is part of the Apache Hadoop Core project. The project URL is http://hadoop.apache.org/.
storage  big-data  hadoop  file-system  HDFS 
8 days ago by kOoLiNuS
ntop - High Performance Network Monitoring Solutions based on Open Source and Commodity Hardware.
Packet Capture - Wire-speed packet capture/transmission using commodity hardware with PF_RING. Zero-Copy packet distribution across threads, applications, Virtual Machines. Libpcap support for seamless integration with legacy applications.

Traffic Recording - 10 Gbit and above lossless network traffic recording with n2disk. Industry standard PCAP file format. On-the-fly indexing to quickly retrieve interesting packets using fast-BPF and time interval. Precise traffic replay with disk2n.

Network Probe - nProbe: extensible NetFlow v5/v9/IPFIX probe with plugins support for L7 content inspection. nProbe Cento: up to 100 Gbit NetFlow, traffic classification, and packet shunting for IDS/packet-to-disk acceleration.

Traffic Analysis - High-speed web-based traffic analysis and flow collection using ntopng. Persistent traffic statistics in RRD format. Layer 7 analysis by leveraging on nDPI, an Open Source DPI framework.
networking  monitoring  big-data  analytics  security  cool-tools 
22 days ago by liqweed
BigDAMA - Big Data Analytics for Network Traffic Monitoring and Analysis
The complexity of the Internet has dramatically increased in the last few years, making it more important and challenging to design scalable Network Traffic Monitoring and Analysis applications and tools. The Big-DAMA project is conceiving novel scalable techniques and big-data frameworks capable to analyze both online network traffic data streams and offline massive traffic datasets. The team is exploring scalable online and offline data mining and machine learning-based techniques to monitor and characterize extremely large network traffic datasets.
networking  big-data  analytics  machine-learning 
22 days ago by liqweed

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