meta_srv/procedure/region_migration/
close_downgraded_region.rs

1// Copyright 2023 Greptime Team
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 std::any::Any;
16
17use api::v1::meta::MailboxMessage;
18use common_meta::RegionIdent;
19use common_meta::distributed_time_constants::default_distributed_time_constants;
20use common_meta::instruction::{Instruction, InstructionReply, SimpleReply};
21use common_procedure::{Context as ProcedureContext, Status};
22use common_telemetry::tracing_context::TracingContext;
23use common_telemetry::{info, warn};
24use serde::{Deserialize, Serialize};
25use snafu::ResultExt;
26
27use crate::error::{self, Result};
28use crate::handler::HeartbeatMailbox;
29use crate::procedure::region_migration::migration_end::RegionMigrationEnd;
30use crate::procedure::region_migration::{Context, State};
31use crate::service::mailbox::Channel;
32
33#[derive(Debug, Serialize, Deserialize)]
34pub struct CloseDowngradedRegion;
35
36#[async_trait::async_trait]
37#[typetag::serde]
38impl State for CloseDowngradedRegion {
39    async fn next(
40        &mut self,
41        ctx: &mut Context,
42        _procedure_ctx: &ProcedureContext,
43    ) -> Result<(Box<dyn State>, Status)> {
44        if let Err(err) = self.close_downgraded_leader_region(ctx).await {
45            let downgrade_leader_datanode = &ctx.persistent_ctx.from_peer;
46            let region_ids = &ctx.persistent_ctx.region_ids;
47            warn!(err; "Failed to close downgraded leader regions: {region_ids:?} on datanode {:?}", downgrade_leader_datanode);
48        }
49        info!(
50            "Region migration is finished: regions: {:?}, from_peer: {}, to_peer: {}, trigger_reason: {}, {}",
51            ctx.persistent_ctx.region_ids,
52            ctx.persistent_ctx.from_peer,
53            ctx.persistent_ctx.to_peer,
54            ctx.persistent_ctx.trigger_reason,
55            ctx.volatile_ctx.metrics,
56        );
57        Ok((Box::new(RegionMigrationEnd), Status::done()))
58    }
59
60    fn as_any(&self) -> &dyn Any {
61        self
62    }
63}
64
65impl CloseDowngradedRegion {
66    /// Builds close region instruction.
67    ///
68    /// Abort(non-retry):
69    /// - Datanode Table is not found.
70    async fn build_close_region_instruction(&self, ctx: &mut Context) -> Result<Instruction> {
71        let pc = &ctx.persistent_ctx;
72        let downgrade_leader_datanode_id = pc.from_peer.id;
73        let region_ids = &ctx.persistent_ctx.region_ids;
74        let mut idents = Vec::with_capacity(region_ids.len());
75
76        for region_id in region_ids {
77            idents.push(RegionIdent {
78                datanode_id: downgrade_leader_datanode_id,
79                table_id: region_id.table_id(),
80                region_number: region_id.region_number(),
81                // The `engine` field is not used for closing region.
82                engine: String::new(),
83            });
84        }
85
86        Ok(Instruction::CloseRegions(idents))
87    }
88
89    /// Closes the downgraded leader region.
90    async fn close_downgraded_leader_region(&self, ctx: &mut Context) -> Result<()> {
91        let close_instruction = self.build_close_region_instruction(ctx).await?;
92        let region_ids = &ctx.persistent_ctx.region_ids;
93        let pc = &ctx.persistent_ctx;
94        let downgrade_leader_datanode = &pc.from_peer;
95        let tracing_ctx = TracingContext::from_current_span();
96        let msg = MailboxMessage::json_message(
97            &format!("Close downgraded regions: {:?}", region_ids),
98            &format!("Metasrv@{}", ctx.server_addr()),
99            &format!(
100                "Datanode-{}@{}",
101                downgrade_leader_datanode.id, downgrade_leader_datanode.addr
102            ),
103            common_time::util::current_time_millis(),
104            &close_instruction,
105            Some(tracing_ctx.to_w3c()),
106        )
107        .with_context(|_| error::SerializeToJsonSnafu {
108            input: close_instruction.to_string(),
109        })?;
110
111        let ch = Channel::Datanode(downgrade_leader_datanode.id);
112        let receiver = ctx
113            .mailbox
114            .send(&ch, msg, default_distributed_time_constants().region_lease)
115            .await?;
116
117        match receiver.await {
118            Ok(msg) => {
119                let reply = HeartbeatMailbox::json_reply(&msg)?;
120                info!(
121                    "Received close downgraded leade region reply: {:?}, region: {:?}",
122                    reply, region_ids
123                );
124                let InstructionReply::CloseRegions(SimpleReply { result, error }) = reply else {
125                    return error::UnexpectedInstructionReplySnafu {
126                        mailbox_message: msg.to_string(),
127                        reason: "expect close region reply",
128                    }
129                    .fail();
130                };
131
132                if result {
133                    Ok(())
134                } else {
135                    error::UnexpectedSnafu {
136                        violated: format!(
137                            "Failed to close downgraded leader region: {region_ids:?} on datanode {:?}, error: {error:?}",
138                            downgrade_leader_datanode,
139                        ),
140                    }
141                    .fail()
142                }
143            }
144
145            Err(e) => Err(e),
146        }
147    }
148}
meta_srv/procedure/region_migration/close_downgraded_region.rs

meta_srv/procedure/region_migration/
close_downgraded_region.rs
