Fast data parts loading by delaying table startup process#28313
Merged
tavplubix merged 1 commit intoClickHouse:masterfrom Aug 30, 2021
Merged
Fast data parts loading by delaying table startup process#28313tavplubix merged 1 commit intoClickHouse:masterfrom
tavplubix merged 1 commit intoClickHouse:masterfrom
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robot-clickhouse
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Could you please explain why does it make data parts loading faster? |
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After table starting up, there can be many background merges and fetches and these tasks are quite disk intensive, which contend disk resources against the part loading process. |
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A test result from production env: 40 min -> 24 min. |
tavplubix
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Aug 30, 2021
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ClickHouse special build check - internal CI issue |
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@amosbird the iotop result: |
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Speed up data parts loading by delaying table startup process.
Detailed description / Documentation draft:
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