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Merge pull request #57335 from sichenzhao/increase_default_replicated_deduplication_window

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increase default replicated_deduplication_window from 100 to 1k
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Sema Checherinda 2023-12-02 21:23:39 +01:00 committed by GitHub
commit c61cd6aab2
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3 changed files with 3 additions and 3 deletions
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2
docs/en/operations/settings/merge-tree-settings.md
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@ -149,7 +149,7 @@ Possible values:
- Any positive integer.
- 0 (disable deduplication)
Default value: 100.
Default value: 1000.
The `Insert` command creates one or more blocks (parts). For [insert deduplication](../../engines/table-engines/mergetree-family/replication.md), when writing into replicated tables, ClickHouse writes the hash sums of the created parts into ClickHouse Keeper. Hash sums are stored only for the most recent `replicated_deduplication_window` blocks. The oldest hash sums are removed from ClickHouse Keeper.
A large number of `replicated_deduplication_window` slows down `Inserts` because it needs to compare more entries.

2
docs/ru/operations/settings/merge-tree-settings.md
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@ -119,7 +119,7 @@ Eсли суммарное число активных кусков во все
- Положительное целое число.
- 0 (без ограничений).
Значение по умолчанию: 100.
Значение по умолчанию: 1000.
Команда `Insert` создает один или несколько блоков (кусков). При вставке в Replicated таблицы ClickHouse для [дедупликации вставок](../../engines/table-engines/mergetree-family/replication.md) записывает в Zookeeper хеш-суммы созданных кусков. Но хранятся только последние `replicated_deduplication_window` хеш-сумм. Самые старые хеш-суммы удаляются из Zookeeper.
Большое значение `replicated_deduplication_window` замедляет `Insert`, так как приходится сравнивать большее количество хеш-сумм.

2
src/Storages/MergeTree/MergeTreeSettings.h
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@ -91,7 +91,7 @@ struct Settings;
M(UInt64, simultaneous_parts_removal_limit, 0, "Maximum number of parts to remove during one CleanupThread iteration (0 means unlimited).", 0) \
\
/** Replication settings. */ \
M(UInt64, replicated_deduplication_window, 100, "How many last blocks of hashes should be kept in ZooKeeper (old blocks will be deleted).", 0) \
M(UInt64, replicated_deduplication_window, 1000, "How many last blocks of hashes should be kept in ZooKeeper (old blocks will be deleted).", 0) \
M(UInt64, replicated_deduplication_window_seconds, 7 * 24 * 60 * 60 /* one week */, "Similar to \"replicated_deduplication_window\", but determines old blocks by their lifetime. Hash of an inserted block will be deleted (and the block will not be deduplicated after) if it outside of one \"window\". You can set very big replicated_deduplication_window to avoid duplicating INSERTs during that period of time.", 0) \
M(UInt64, replicated_deduplication_window_for_async_inserts, 10000, "How many last hash values of async_insert blocks should be kept in ZooKeeper (old blocks will be deleted).", 0) \
M(UInt64, replicated_deduplication_window_seconds_for_async_inserts, 7 * 24 * 60 * 60 /* one week */, "Similar to \"replicated_deduplication_window_for_async_inserts\", but determines old blocks by their lifetime. Hash of an inserted block will be deleted (and the block will not be deduplicated after) if it outside of one \"window\". You can set very big replicated_deduplication_window to avoid duplicating INSERTs during that period of time.", 0) \