GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/10851
[SPARK-12818] Initial implementation of count min sketch
This PR adds an initial implementation of count min sketch, contained in a
new module spark-sketch under `common/sketch`. The implementation is based on
the [`CountMinSketch` class in stream-lib][1].
As required in the [design doc][2], spark-sketch should have no external
dependency.
Two classes, `Murmur3_x86_32` and `Platform` are copied to spark-sketch
from spark-unsafe for hashing. They'll also be used in the upcoming bloom
filter implementation.
TODO:
- [ ] Javadocs
Follow-ups:
- Serialization support
- DataFrame API integration
[1]:
https://github.com/addthis/stream-lib/blob/aac6b4d23a8686b000f80baa447e0922ecac3bcb/src/main/java/com/clearspring/analytics/stream/frequency/CountMinSketch.java
[2]:
https://issues.apache.org/jira/secure/attachment/12782378/BloomFilterandCount-MinSketchinSpark2.0.pdf
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liancheng/spark count-min-sketch
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10851.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #10851
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commit 1eee6f30bcecd76b02188cef4a0b24572d531069
Author: Cheng Lian <[email protected]>
Date: 2016-01-18T18:23:11Z
Adds spark-sketch skeleton
commit 7a41b752a8b22af4f82fda056f967367a3ffaf40
Author: Cheng Lian <[email protected]>
Date: 2016-01-19T21:17:30Z
Moves sketch to common/sketch
commit 9ac62ed1a295aaf7bb19f09af30e275924041e7c
Author: Cheng Lian <[email protected]>
Date: 2016-01-19T21:52:10Z
Copies Murmur3_x86_32 and Platform from unsafe
commit 1a63a4c1229fe6b36a7f36edc27e931f4bbf86d8
Author: Cheng Lian <[email protected]>
Date: 2016-01-20T00:24:25Z
Initial version of CountMinSketch
commit e29e8aaf47b2d03763b84633d4ce64ea94bdce57
Author: Cheng Lian <[email protected]>
Date: 2016-01-20T20:02:08Z
Tests accuracy for all supported types
commit bb7435f1b596bebc2746dce6172a7c7503e4c8fc
Author: Cheng Lian <[email protected]>
Date: 2016-01-20T21:32:36Z
Tests mergeInPlace
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