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ASF GitHub Bot logged work on BEAM-5964:
----------------------------------------
Author: ASF GitHub Bot
Created on: 28/Feb/19 17:13
Start Date: 28/Feb/19 17:13
Worklog Time Spent: 10m
Work Description: kanterov commented on pull request #7962: [BEAM-5964]
ClickHouseIO: Add Enum8/Enum16 support
URL: https://github.com/apache/beam/pull/7962
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Issue Time Tracking
-------------------
Worklog Id: (was: 205873)
Time Spent: 8h 50m (was: 8h 40m)
> Add ClickHouseIO.Write
> ----------------------
>
> Key: BEAM-5964
> URL: https://issues.apache.org/jira/browse/BEAM-5964
> Project: Beam
> Issue Type: New Feature
> Components: io-ideas
> Reporter: Gleb Kanterov
> Assignee: Gleb Kanterov
> Priority: Major
> Labels: triaged
> Time Spent: 8h 50m
> Remaining Estimate: 0h
>
> h3. Motivation
> ClickHouse is open-source columnar DBMS for OLAP. It allows analysis of data
> that is updated in real time. The project was released as open-source
> software under the Apache 2 license in June 2016.
> h3. Design and implementation
> 1. Do only writes, reads aren't useful because ClickHouse is designed for
> OLAP queries
> 2. For writes, do write in batches and rely on idempotent and atomic inserts
> supported by replicated tables in ClickHouse
> 3. Implement ClickHouseIO.Write as PTransform<PCollection<Row>, PDone>
> 4. Rely on having logic for casting rows between schemas in BEAM-5918, and
> don't put it in ClickHouseIO.Write
> h3. References
> [1]
> http://highscalability.com/blog/2017/9/18/evolution-of-data-structures-in-yandexmetrica.html
> [2]
> https://blog.cloudflare.com/how-cloudflare-analyzes-1m-dns-queries-per-second/
> [3]
> https://blog.cloudflare.com/http-analytics-for-6m-requests-per-second-using-clickhouse/
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