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Fix max_distributed_connections (one more time)

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With prefer_localhost_replica=1 max_distributed_connections uses
max_threads before this patch.

Fixes: #14936
Previous fix: #9673
This commit is contained in:
Azat Khuzhin 2020-12-07 01:12:54 +03:00
parent e62ef0ab56
commit c3a4e5e7b7
3 changed files with 21 additions and 1 deletions
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7
src/Interpreters/InterpreterSelectQuery.cpp
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@ -1550,7 +1550,12 @@ void InterpreterSelectQuery::executeFetchColumns(
throw Exception("Logical error in InterpreterSelectQuery: nowhere to read", ErrorCodes::LOGICAL_ERROR);
/// Specify the number of threads only if it wasn't specified in storage.
if (!query_plan.getMaxThreads())
///
/// But in case of remote query and prefer_localhost_replica=1 (default)
/// The inner local query (that is done in the same process, without
/// network interaction), it will setMaxThreads earlier and distributed
/// query will not update it.
if (!query_plan.getMaxThreads() || is_remote)
query_plan.setMaxThreads(max_threads_execute_query);
/// Aliases in table declaration.

0
tests/queries/0_stateless/01602_max_distributed_connections.reference Normal file
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15
tests/queries/0_stateless/01602_max_distributed_connections.sh Executable file
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@ -0,0 +1,15 @@
#!/usr/bin/env bash
CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
. "$CURDIR"/../shell_config.sh
common_opts=(
"--format=Null"
"--max_threads=1"
"--max_distributed_connections=3"
)
# NOTE: the test use higher timeout to avoid flakiness.
timeout 9s ${CLICKHOUSE_CLIENT} "$@" "${common_opts[@]}" -q "select sleep(3) from remote('127.{1,2,3,4,5}', system.one)" --prefer_localhost_replica=0
timeout 9s ${CLICKHOUSE_CLIENT} "$@" "${common_opts[@]}" -q "select sleep(3) from remote('127.{1,2,3,4,5}', system.one)" --prefer_localhost_replica=1