[jira] [Created] (FLINK-1292) Allow for longer normalized keys

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-1292:
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             Summary: Allow for longer normalized keys
                 Key: FLINK-1292
                 URL: https://issues.apache.org/jira/browse/FLINK-1292
             Project: Flink
          Issue Type: Improvement
          Components: Local Runtime
    Affects Versions: 0.8-incubating
            Reporter: Stephan Ewen
             Fix For: 0.8-incubating


The normalized key sorter currently has a hardwired limit of a normalized key size of 8 bytes. This still comes from the "single key" era.

For composite keys, this length is easily exceeded and sorts cannot happen as fast as the could. On the other hand, setting the value arbitrarily large impacts memory consumption.

I propose to extend this to allow for 8 bytes per key up to a total length of 16 bytes. This fits at least two composite longs, or a sequence of Ints.



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