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@ -894,4 +894,19 @@ Error count of each replica is capped at this value, preventing a single replica
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- [Table engine Distributed](../../operations/table_engines/distributed.md)
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- [`distributed_replica_error_half_life`](#settings-distributed_replica_error_half_life)
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## os_thread_priority {#setting-os_thread_priority}
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Sets the priority ([nice](https://en.wikipedia.org/wiki/Nice_(Unix))) for threads that execute queries. OS scheduler considers this priority when choosing the next thread to run on each available CPU core.
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!!! warning "Warning"
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To use this setting, you need to set the `CAP_SYS_NICE` capability. The `clickhouse-server` package sets it up during installation. Some virtual environments don't allow to set the `CAP_SYS_NICE` capability. In this case `clickhouse-server` shows a message about it at the start.
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Possible values:
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You can set values in the `[-20, 19]` range.
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The lower value means a higher priority. Threads with low values of `nice` priority are executed more frequently than threads with high values. High values are preferable for long running non-interactive queries because it allows them to quickly give up resources in favour of short interactive queries when they arrive.
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Default value: 0.
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[Original article](https://clickhouse.yandex/docs/en/operations/settings/settings/) <!-- hide -->
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@ -62,7 +62,7 @@ Columns:
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Please note that `errors_count` is updated once per query to the cluster, but `estimated_recovery_time` is recalculated on-demand. So there could be a case of non-zero `errors_count` and zero `estimated_recovery_time`, that next query will zero `errors_count` and try to use replica as if it has no errors.
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** See also **
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**See also**
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- [Table engine Distributed](table_engines/distributed.md)
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- [distributed_replica_error_cap setting](settings/settings.md#settings-distributed_replica_error_cap)
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