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add new config hashagg_use_magic_hash for tiflash #20330

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add new config hashagg_use_magic_hash for tiflash #20330

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2ea7d7a
add new config hashagg_use_magic_hash for tiflash
guo-shaoge Feb 20, 2025
6c52f84
update version
guo-shaoge Feb 28, 2025
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5 changes: 5 additions & 0 deletions tiflash/tiflash-configuration.md
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Expand Up @@ -279,6 +279,11 @@ delta_index_cache_size = 0
## New in v6.4.0. This item is used for the MinTSO scheduler. It specifies the maximum number of queries that can run simultaneously in a TiFlash instance. The default value is 0, which means twice the number of vCPUs. For details about the MinTSO scheduler, see https://docs.pingcap.com/tidb/dev/tiflash-mintso-scheduler.
task_scheduler_active_set_soft_limit = 0

## New in v9.0.0. TiFlash's HashAgg will use magic hash instead of the default CRC32 if this item is true.
## The results of magic hash have a more uniform distribution, which reduces hash collisions. However, the computation speed will be slower.
## It is recommended to enable magic hash when the NDV (Number of Distinct Values) of GroupBy key is very high.
hashagg_use_magic_hash = false

## Security settings take effect starting from v4.0.5.
[security]
## New in v5.0. This configuration item enables or disables log redaction. Value options: `true`, `false`, `"on"`, `"off"`, and `"marker"`. The `"on"`, `"off"`, and `"marker"` options are introduced in v8.2.0.
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