risingwave_frontend/handler/
alter_parallelism.rs

1// Copyright 2023 RisingWave Labs
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use pgwire::pg_response::StatementType;
16use risingwave_pb::meta::table_parallelism::{
17    AdaptiveParallelism, FixedParallelism, PbParallelism,
18};
19use risingwave_pb::meta::{PbTableParallelism, TableParallelism};
20use risingwave_sqlparser::ast::{ObjectName, SetVariableValue, SetVariableValueSingle, Value};
21use risingwave_sqlparser::keywords::Keyword;
22use thiserror_ext::AsReport;
23
24use super::alter_utils::resolve_streaming_job_id_for_alter_parallelism;
25use super::{HandlerArgs, RwPgResponse};
26use crate::catalog::FragmentId;
27use crate::error::{ErrorCode, Result};
28use crate::handler::util::{LongRunningNotificationAction, execute_with_long_running_notification};
29
30pub async fn handle_alter_parallelism(
31    handler_args: HandlerArgs,
32    obj_name: ObjectName,
33    parallelism: SetVariableValue,
34    stmt_type: StatementType,
35    deferred: bool,
36) -> Result<RwPgResponse> {
37    let session = handler_args.session;
38
39    let job_id = resolve_streaming_job_id_for_alter_parallelism(
40        &session,
41        obj_name,
42        stmt_type,
43        "parallelism",
44    )?;
45
46    let target_parallelism = extract_table_parallelism(parallelism)?;
47
48    let mut builder = RwPgResponse::builder(stmt_type);
49
50    let catalog_writer = session.catalog_writer()?;
51    execute_with_long_running_notification(
52        catalog_writer.alter_parallelism(job_id, target_parallelism, deferred),
53        &session,
54        "ALTER PARALLELISM",
55        LongRunningNotificationAction::SuggestRecover,
56    )
57    .await?;
58
59    if deferred {
60        builder = builder.notice("DEFERRED is used, please ensure that automatic parallelism control is enabled on the meta, otherwise, the alter will not take effect.".to_owned());
61    }
62
63    Ok(builder.into())
64}
65
66pub async fn handle_alter_fragment_parallelism(
67    handler_args: HandlerArgs,
68    fragment_ids: Vec<FragmentId>,
69    parallelism: SetVariableValue,
70) -> Result<RwPgResponse> {
71    let session = handler_args.session;
72    let target_parallelism = extract_fragment_parallelism(parallelism)?;
73
74    session
75        .env()
76        .meta_client()
77        .alter_fragment_parallelism(fragment_ids, target_parallelism)
78        .await?;
79
80    Ok(RwPgResponse::builder(StatementType::ALTER_FRAGMENT).into())
81}
82
83fn extract_table_parallelism(parallelism: SetVariableValue) -> Result<TableParallelism> {
84    let adaptive_parallelism = PbTableParallelism {
85        parallelism: Some(PbParallelism::Adaptive(AdaptiveParallelism {})),
86    };
87
88    // If the target parallelism is set to 0/auto/default, we would consider it as auto parallelism.
89    let target_parallelism = match parallelism {
90        SetVariableValue::Single(SetVariableValueSingle::Ident(ident))
91            if ident
92                .real_value()
93                .eq_ignore_ascii_case(&Keyword::ADAPTIVE.to_string()) =>
94        {
95            adaptive_parallelism
96        }
97
98        SetVariableValue::Default => adaptive_parallelism,
99        SetVariableValue::Single(SetVariableValueSingle::Literal(Value::Number(v))) => {
100            let fixed_parallelism = v.parse::<u32>().map_err(|e| {
101                ErrorCode::InvalidInputSyntax(format!(
102                    "target parallelism must be a valid number or adaptive: {}",
103                    e.as_report()
104                ))
105            })?;
106
107            if fixed_parallelism == 0 {
108                adaptive_parallelism
109            } else {
110                PbTableParallelism {
111                    parallelism: Some(PbParallelism::Fixed(FixedParallelism {
112                        parallelism: fixed_parallelism,
113                    })),
114                }
115            }
116        }
117
118        _ => {
119            return Err(ErrorCode::InvalidInputSyntax(
120                "target parallelism must be a valid number or adaptive".to_owned(),
121            )
122            .into());
123        }
124    };
125
126    Ok(target_parallelism)
127}
128
129fn extract_fragment_parallelism(parallelism: SetVariableValue) -> Result<Option<TableParallelism>> {
130    match parallelism {
131        SetVariableValue::Default => Ok(None),
132        other => extract_table_parallelism(other).map(Some),
133    }
134}
risingwave_frontend/handler/alter_parallelism.rs

risingwave_frontend/handler/
alter_parallelism.rs
