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https://issues.apache.org/jira/browse/FLINK-2142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17321764#comment-17321764
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Flink Jira Bot commented on FLINK-2142:
---------------------------------------
This issue and all of its Sub-Tasks have not been updated for 180 days. So, it
has been labeled "stale-minor". If you are still affected by this bug or are
still interested in this issue, please give an update and remove the label. In
7 days the issue will be closed automatically.
> GSoC project: Exact and Approximate Statistics for Data Streams and Windows
> ---------------------------------------------------------------------------
>
> Key: FLINK-2142
> URL: https://issues.apache.org/jira/browse/FLINK-2142
> Project: Flink
> Issue Type: New Feature
> Components: API / DataStream
> Reporter: Gábor Gévay
> Assignee: Gábor Gévay
> Priority: Minor
> Labels: gsoc2015, stale-minor, statistics, streaming
>
> 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.
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