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Revert "Don't allow to set max_parallel_replicas to 0 as it doesn't make sense"

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Kruglov Pavel 2024-03-11 21:05:44 +01:00 committed by GitHub
parent d03a4fa637
commit a90a6e9a27
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7 changed files with 5 additions and 24 deletions
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10
src/Client/ConnectionPoolWithFailover.cpp
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@ -21,7 +21,6 @@ namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int ALL_CONNECTION_TRIES_FAILED;
extern const int BAD_ARGUMENTS;
}
@ -192,20 +191,11 @@ std::vector<ConnectionPoolWithFailover::TryResult> ConnectionPoolWithFailover::g
max_entries = nested_pools.size();
}
else if (pool_mode == PoolMode::GET_ONE)
{
max_entries = 1;
}
else if (pool_mode == PoolMode::GET_MANY)
{
if (settings.max_parallel_replicas == 0)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "The value of the setting max_parallel_replicas must be greater than 0");
max_entries = settings.max_parallel_replicas;
}
else
{
throw DB::Exception(DB::ErrorCodes::LOGICAL_ERROR, "Unknown pool allocation mode");
}
if (!priority_func)
priority_func = makeGetPriorityFunc(settings);

6
src/Client/HedgedConnectionsFactory.cpp
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@ -19,7 +19,6 @@ namespace ErrorCodes
extern const int ALL_CONNECTION_TRIES_FAILED;
extern const int ALL_REPLICAS_ARE_STALE;
extern const int LOGICAL_ERROR;
extern const int BAD_ARGUMENTS;
}
HedgedConnectionsFactory::HedgedConnectionsFactory(
@ -83,10 +82,7 @@ std::vector<Connection *> HedgedConnectionsFactory::getManyConnections(PoolMode
}
case PoolMode::GET_MANY:
{
if (max_parallel_replicas == 0)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "The value of the setting max_parallel_replicas must be greater than 0");
max_entries = std::min(max_parallel_replicas, shuffled_pools.size());
max_entries = max_parallel_replicas;
break;
}
}

2
src/Client/HedgedConnectionsFactory.h
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@ -158,7 +158,7 @@ private:
/// checking the number of requested replicas that are still in process).
size_t requested_connections_count = 0;
const size_t max_parallel_replicas = 1;
const size_t max_parallel_replicas = 0;
const bool skip_unavailable_shards = 0;
};

2
src/Interpreters/InterpreterSelectQuery.cpp
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@ -947,7 +947,7 @@ bool InterpreterSelectQuery::adjustParallelReplicasAfterAnalysis()
if (number_of_replicas_to_use <= 1)
{
context->setSetting("allow_experimental_parallel_reading_from_replicas", Field(0));
context->setSetting("max_parallel_replicas", UInt64{1});
context->setSetting("max_parallel_replicas", UInt64{0});
LOG_DEBUG(log, "Disabling parallel replicas because there aren't enough rows to read");
return true;
}

4
src/Planner/PlannerJoinTree.cpp
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@ -295,7 +295,7 @@ bool applyTrivialCountIfPossible(
/// The query could use trivial count if it didn't use parallel replicas, so let's disable it
query_context->setSetting("allow_experimental_parallel_reading_from_replicas", Field(0));
query_context->setSetting("max_parallel_replicas", UInt64{1});
query_context->setSetting("max_parallel_replicas", UInt64{0});
LOG_TRACE(getLogger("Planner"), "Disabling parallel replicas to be able to use a trivial count optimization");
}
@ -756,7 +756,7 @@ JoinTreeQueryPlan buildQueryPlanForTableExpression(QueryTreeNodePtr table_expres
{
planner_context->getMutableQueryContext()->setSetting(
"allow_experimental_parallel_reading_from_replicas", Field(0));
planner_context->getMutableQueryContext()->setSetting("max_parallel_replicas", UInt64{1});
planner_context->getMutableQueryContext()->setSetting("max_parallel_replicas", UInt64{0});
LOG_DEBUG(getLogger("Planner"), "Disabling parallel replicas because there aren't enough rows to read");
}
else if (number_of_replicas_to_use < settings.max_parallel_replicas)

0
tests/queries/0_stateless/03001_max_parallel_replicas_zero_value.reference
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5
tests/queries/0_stateless/03001_max_parallel_replicas_zero_value.sql
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@ -1,5 +0,0 @@
drop table if exists test_d;
create table test_d engine=Distributed(test_cluster_two_shard_three_replicas_localhost, system, numbers);
select * from test_d limit 10 settings max_parallel_replicas = 0, prefer_localhost_replica = 0; --{serverError BAD_ARGUMENTS}
drop table test_d;