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alex-zaitsev avatar alex-zaitsev commented on June 1, 2024

@ikosyanenko , Scaling up does not loose any data. The data loss is only possible if you scale cluster down and remove shards.

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ikosyanenko avatar ikosyanenko commented on June 1, 2024

@alex-zaitsev one more question. How do you move shard? Copying?

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alex-zaitsev avatar alex-zaitsev commented on June 1, 2024

@ikosyanenko , what do you mean by 'move shard', could you elaborate your use case?

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ikosyanenko avatar ikosyanenko commented on June 1, 2024

If I am scaling up a cluster. Do you move existed shards?

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alex-zaitsev avatar alex-zaitsev commented on June 1, 2024

No, we don't. New shards are empty. You can manually move data with 'insert select' or using https://clickhouse.yandex/docs/en/operations/utils/clickhouse-copier/

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ikosyanenko avatar ikosyanenko commented on June 1, 2024

Ok, thanks

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