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This commit is contained in:
alesapin 2022-04-04 18:28:26 +02:00
parent 86f42e7a3a
commit 72331856eb
1 changed files with 6 additions and 3 deletions
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9
src/Storages/Kafka/StorageKafka.cpp
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@ -783,9 +783,12 @@ void registerStorageKafka(StorageFactory & factory)
if (num_consumers > max_consumers)
{
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Number of consumers can not be bigger than {}, it just doesn't make sense. "
"Note that kafka_num_consumers is not number of consumers for Kafka partitions -- they are managed by Kafka client library. "
"kafka_num_consumers is internal amount of threads for ClickHouse and it shouldn't be big", max_consumers);
throw Exception(ErrorCodes::BAD_ARGUMENTS, "The number of consumers can not be bigger than {}. "
"A single consumer can read any number of partitions. Extra consumers are relatively expensive, "
"and using a lot of them can lead to high memory and CPU usage. To achieve better performance "
"of getting data from Kafka, consider using a setting kafka_thread_per_consumer=1, "
"and ensure you have enough threads in MessageBrokerSchedulePool (background_message_broker_schedule_pool_size). "
"See also https://clickhouse.com/docs/integrations/kafka/kafka-table-engine#tuning-performance", max_consumers);
}
else if (num_consumers < 1)
{