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ryan
9b3555c569
Observability writers flushed every few seconds with MinBatchSize unset, creating constant small parts and merge load. Enable MinBatchSize with MaxFlushWait, batch access logs more aggressively, and shrink ClickHouse background pools for 3c hosts.
18 lines
841 B
XML
18 lines
841 B
XML
<?xml version="1.0"?>
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<!--
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Tuned for small control-plane hosts (e.g. 3c6g).
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background_pool_size should stay near the vCPU count; oversized pools cause
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idle merge threads to burn CPU while absorbing small parts from heartbeats.
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-->
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<clickhouse>
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<max_concurrent_queries>20</max_concurrent_queries>
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<background_pool_size>2</background_pool_size>
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<background_merges_mutations_concurrency_ratio>1</background_merges_mutations_concurrency_ratio>
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<background_schedule_pool_size>4</background_schedule_pool_size>
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<background_common_pool_size>2</background_common_pool_size>
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<background_fetches_pool_size>2</background_fetches_pool_size>
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<background_move_pool_size>1</background_move_pool_size>
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<mark_cache_size>268435456</mark_cache_size>
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<uncompressed_cache_size>0</uncompressed_cache_size>
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</clickhouse>
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