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Posted to issues@flink.apache.org by "Gabor Gevay (JIRA)" <ji...@apache.org> on 2015/06/03 11:51:49 UTC
[jira] [Created] (FLINK-2145) Median calculation for windows
Gabor Gevay created FLINK-2145:
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Summary: Median calculation for windows
Key: FLINK-2145
URL: https://issues.apache.org/jira/browse/FLINK-2145
Project: Flink
Issue Type: Sub-task
Components: Streaming
Reporter: Gabor Gevay
Assignee: Gabor Gevay
Priority: Minor
The PreReducer for this has the following algorithm: We maintain two multisets (as, for example, balanced binary search trees), that always partition the elements of the current window to smaller-than-median and larger-than-median elements. At each store and evict, we can maintain this invariant with only O(1) multiset operations.
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