[FLINK-2142] GSoC project: Exact and Approximate Statistics for Data Streams and Windows

• Type: New Feature
• Status: Reopened
• Priority: Not a Priority
• Resolution: Unresolved
• Component/s: API / DataStream
• Labels: gsoc2015 stale-assigned statistics streaming
• Assignee: Gábor Gévay
• Reporter: Gábor Gévay
• Created: 03/Jun/15 09:35
• Updated: 29/Jul/21 10:08

Description

The goal of this project is to implement basic statistics of data streams and windows (like average, median, variance, correlation, etc.) in a computationally efficient manner. This involves designing custom PreReducers.

The exact calculation of some statistics (eg. frequencies, or the number of distinct elements) would require memory proportional to the number of elements in the input (the window or the entire stream). However, there are efficient algorithms and data structures using less memory for calculating the same statistics only approximately, with user-specified error bounds.