ClickHouse/tests/queries/0_stateless/01602_max_distributed_connections.sh

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#!/usr/bin/env bash
CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
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# shellcheck source=../shell_config.sh
. "$CURDIR"/../shell_config.sh
# We check that even if max_threads is small, the setting max_distributed_connections
# will allow to process queries on multiple shards concurrently.
# We do sleep 1.5 seconds on ten machines.
# If concurrency is one (bad) the query will take at least 15 seconds and the following loops are guaranteed to be infinite.
# If concurrency is 10 (good), the query may take less than 10 second with non-zero probability
# and the following loops will finish with probability 1 assuming independent random variables.
while true; do
timeout 10 ${CLICKHOUSE_CLIENT} --max_threads 1 --max_distributed_connections 10 --query "
SELECT sleep(1.5) FROM remote('127.{1..10}', system.one) FORMAT Null" --prefer_localhost_replica=0 && break
done
while true; do
timeout 10 ${CLICKHOUSE_CLIENT} --max_threads 1 --max_distributed_connections 10 --query "
SELECT sleep(1.5) FROM remote('127.{1..10}', system.one) FORMAT Null" --prefer_localhost_replica=1 && break
done
# If max_distributed_connections is low and async_socket_for_remote is disabled,
# the concurrency of distributed queries will be also low.
timeout 1 ${CLICKHOUSE_CLIENT} --max_threads 1 --max_distributed_connections 1 --async_socket_for_remote 0 --query "
SELECT sleep(0.15) FROM remote('127.{1..10}', system.one) FORMAT Null" --prefer_localhost_replica=0 && echo 'Fail'
timeout 1 ${CLICKHOUSE_CLIENT} --max_threads 1 --max_distributed_connections 1 --async_socket_for_remote 0 --query "
SELECT sleep(0.15) FROM remote('127.{1..10}', system.one) FORMAT Null" --prefer_localhost_replica=1 && echo 'Fail'
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echo 'Ok'