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From "Greg Hogan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-4705) Instrument FixedLengthRecordSorter
Date Wed, 19 Oct 2016 16:05:59 GMT

     [ https://issues.apache.org/jira/browse/FLINK-4705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Greg Hogan updated FLINK-4705:
------------------------------
    Issue Type: Sub-task  (was: Improvement)
        Parent: FLINK-4860

> Instrument FixedLengthRecordSorter
> ----------------------------------
>
>                 Key: FLINK-4705
>                 URL: https://issues.apache.org/jira/browse/FLINK-4705
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Local Runtime
>    Affects Versions: 1.2.0
>            Reporter: Greg Hogan
>            Assignee: Greg Hogan
>
> The {{NormalizedKeySorter}} sorts on the concatenation of (potentially partial) keys
plus an 8-byte pointer to the record. After sorting each pointer must be dereferenced, which
is not cache friendly.
> The {{FixedLengthRecordSorter}} sorts on the concatentation of full keys followed by
the remainder of the record. The records can then be deserialized in sequence.
> Instrumenting the {{FixedLengthRecordSorter}} requires implementing the comparator methods
{{writereadWithKeyNormalization}} and {{readWithKeyNormalization}}.
> Testing {{JaccardIndex}} on an m4.16xlarge the scale 18 runtime dropped from 71.8 to
68.8 s (4.3% faster) and the scale 20 runtime dropped from 546.1 to 501.8 s (8.8% faster).



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