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84 lines
2.1 KiB
Markdown
84 lines
2.1 KiB
Markdown
---
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sidebar_label: WikiStat
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---
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# WikiStat
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The dataset contains 0.5 trillion records.
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See the video from FOSDEM 2023: https://www.youtube.com/watch?v=JlcI2Vfz_uk
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And the presentation: https://presentations.clickhouse.com/fosdem2023/
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Data source: https://dumps.wikimedia.org/other/pageviews/
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Getting the list of links:
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``` shell
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for i in {2015..2023}; do
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for j in {01..12}; do
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echo "${i}-${j}" >&2
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curl -sSL "https://dumps.wikimedia.org/other/pageviews/$i/$i-$j/" \
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| grep -oE 'pageviews-[0-9]+-[0-9]+\.gz'
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done
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done | sort | uniq | tee links.txt
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```
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Downloading the data:
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``` shell
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sed -r 's!pageviews-([0-9]{4})([0-9]{2})[0-9]{2}-[0-9]+\.gz!https://dumps.wikimedia.org/other/pageviews/\1/\1-\2/\0!' \
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links.txt | xargs -P3 wget --continue
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```
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(it will take about 3 days)
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Creating a table:
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``` sql
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CREATE TABLE wikistat
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(
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time DateTime CODEC(Delta, ZSTD(3)),
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project LowCardinality(String),
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subproject LowCardinality(String),
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path String CODEC(ZSTD(3)),
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hits UInt64 CODEC(ZSTD(3))
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)
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ENGINE = MergeTree
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ORDER BY (path, time);
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```
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Loading the data:
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``` shell
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clickhouse-local --query "
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WITH replaceRegexpOne(_path, '^.+pageviews-(\\d{4})(\\d{2})(\\d{2})-(\\d{2})(\\d{2})(\\d{2}).gz$', '\1-\2-\3 \4-\5-\6')::DateTime AS time,
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extractGroups(line, '^([^ \\.]+)(\\.[^ ]+)? +([^ ]+) +(\\d+) +(\\d+)$') AS values
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SELECT
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time,
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values[1] AS project,
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values[2] AS subproject,
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values[3] AS path,
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(values[4])::UInt64 AS hits
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FROM file('pageviews*.gz', LineAsString)
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WHERE length(values) = 5 FORMAT Native
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" | clickhouse-client --query "INSERT INTO wikistat FORMAT Native"
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```
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Or loading the cleaning data:
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``` sql
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INSERT INTO wikistat WITH
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parseDateTimeBestEffort(extract(_file, '^pageviews-([\\d\\-]+)\\.gz$')) AS time,
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splitByChar(' ', line) AS values,
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splitByChar('.', values[1]) AS projects
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SELECT
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time,
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projects[1] AS project,
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projects[2] AS subproject,
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decodeURLComponent(values[2]) AS path,
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CAST(values[3], 'UInt64') AS hits
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FROM s3(
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'https://clickhouse-public-datasets.s3.amazonaws.com/wikistat/original/pageviews*.gz',
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LineAsString)
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WHERE length(values) >= 3
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```
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