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chasing 32 ms tail latency in clickhouse

Engineering

Chasing that 32 ms tail latency in ClickHouse

A customer saw an extra ~32 ms on simple SELECT queries after idle periods. We traced it to unbatched Native protocol metadata packets overflowing a reset TCP congestion window, reproduced it with network namespaces, and fixed it by batching them.

kavi kanagaraj photo
Kavi Kanagaraj
Oct 13, 2026 · 14 minutes read
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Company and culture

ClickHouse Meetup in Limassol on May 7, 2019

ClickHouse Editor · May 14, 2019
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Company and culture

Schedule of ClickHouse Meetups in China for 2019

ClickHouse Editor · Apr 18, 2019
2018-11-22-clickhouse-meetup-in-amsterdam.jpeg
Company and culture

Concept: "Cloud" MergeTree Tables

ClickHouse Editor · Nov 23, 2018
2018-11-12-clickhouse-at-percona-live-europe.jpeg
Company and culture

ClickHouse at Percona Live Europe 2018

ClickHouse Editor · Nov 18, 2018
2018-11-22-clickhouse-meetup-in-amsterdam.jpeg
Company and culture

ClickHouse Meetup in Amsterdam on November 15, 2018

ClickHouse Editor · Nov 15, 2018
2018-11-12-clickhouse-community-meetup-in-beijing (1).jpeg
Company and culture

ClickHouse Community Meetup in Beijing on October 28, 2018

ClickHouse Editor · Nov 12, 2018
2018-11-4-clickhouse-at-analysys.jpeg
Company and culture

ClickHouse at Analysys A10 2018

ClickHouse Editor · Nov 4, 2018
2018-10-17-announcing-clickhouse-meetup-in-amsterdam.jpeg
Company and culture

Announcing ClickHouse Meetup in Amsterdam on November 15

ClickHouse Editor · Oct 17, 2018
2018-10-9-clickhouse-community-meetup-in-paris.jpeg
Company and culture

ClickHouse Community Meetup in Paris on October 2, 2018

ClickHouse Editor · Oct 9, 2018
2018-7-5-clickhouse-community-meetup-in-berlin.jpeg
Company and culture

ClickHouse Community Meetup in Berlin on July 3, 2018

ClickHouse Editor · Jul 5, 2018
2018-6-25-announcing-clickhouse-community-meetup.jpeg
Company and culture

Announcing ClickHouse Community Meetup in Berlin on July 3

ClickHouse Editor · Jun 25, 2018
2019-4-11-clickhouse-meetup-in-madrid.jpeg
Company and culture

ClickHouse Meetup in Madrid on April 2, 2019

ClickHouse Editor · Apr 11, 2018
2018-2-8-clickhouse-community-meetup-in-beijing.jpeg
Company and culture

ClickHouse Community Meetup in Beijing on January 27, 2018

ClickHouse Editor · Feb 8, 2018
2017-10-19-clickhouse-meetup-in-berlin.jpeg
Company and culture

Join the ClickHouse Meetup in Berlin

ClickHouse Editor · Oct 19, 2017
2017-10-19-clickhouse-meetup-in-berlin-2.jpeg
Company and culture

ClickHouse Meetup in Berlin, October 5, 2017

ClickHouse Editor · Oct 5, 2017
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