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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4705) Instrument FixedLengthRecordSorter
Date Fri, 02 Dec 2016 12:30:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15715010#comment-15715010
] 

ASF GitHub Bot commented on FLINK-4705:
---------------------------------------

Github user StephanEwen commented on the issue:

    https://github.com/apache/flink/pull/2617
  
    @greghogan I am quite deep into some large scale deployment and scalability issues right
now. I plan to write a mail to the mailing list on that, actually.
    
    If possible, I'd like to defer this for a bit. I hope to find some time between the years
to go over pull request and do catching up with these threads.


> 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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