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endpoint.rs
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endpoint.rs
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// Copyright 2020 TiKV Project Authors. Licensed under Apache-2.0.
use std::fmt;
use std::sync::Arc;
use std::time::Duration;
use engine_rocks::RocksEngine;
use futures::future::{lazy, Future};
use kvproto::cdcpb::*;
use kvproto::metapb::Region;
use pd_client::PdClient;
use raftstore::coprocessor::CmdBatch;
use raftstore::store::fsm::ChangeCmd;
use raftstore::store::msg::{Callback, CasualMessage, ReadResponse};
use raftstore::store::transport::CasualRouter;
use resolved_ts::Resolver;
use tikv::storage::kv::Snapshot;
use tikv::storage::mvcc::{DeltaScanner, ScannerBuilder};
use tikv::storage::txn::TxnEntry;
use tikv::storage::txn::TxnEntryScanner;
use tikv_util::collections::HashMap;
use tikv_util::timer::SteadyTimer;
use tikv_util::worker::{Runnable, ScheduleError, Scheduler};
use tokio_threadpool::{Builder, Sender as PoolSender, ThreadPool};
use txn_types::{Key, Lock, TimeStamp};
use crate::delegate::{Delegate, Downstream, DownstreamID};
use crate::service::{Conn, ConnID};
use crate::{CdcObserver, Error, Result};
pub enum Task {
Register {
request: ChangeDataRequest,
downstream: Downstream,
conn_id: ConnID,
},
Deregister {
region_id: Option<u64>,
downstream_id: Option<DownstreamID>,
conn_id: Option<ConnID>,
err: Option<Error>,
},
OpenConn {
conn: Conn,
},
MultiBatch {
multi: Vec<CmdBatch>,
},
MinTS {
min_ts: TimeStamp,
},
ResolverReady {
region_id: u64,
region: Region,
resolver: Resolver,
},
IncrementalScan {
region_id: u64,
downstream_id: DownstreamID,
entries: Vec<Option<TxnEntry>>,
},
Validate(u64, Box<dyn FnOnce(Option<&Delegate>) + Send>),
}
impl fmt::Display for Task {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?}", self)
}
}
impl fmt::Debug for Task {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut de = f.debug_struct("CdcTask");
match self {
Task::Register {
ref request,
ref downstream,
ref conn_id,
..
} => de
.field("register request", request)
.field("request", request)
.field("id", &downstream.get_id())
.field("conn_id", conn_id)
.finish(),
Task::Deregister {
ref region_id,
ref downstream_id,
ref conn_id,
ref err,
} => de
.field("deregister", &"")
.field("region_id", region_id)
.field("err", err)
.field("downstream_id", downstream_id)
.field("conn_id", conn_id)
.finish(),
Task::OpenConn { ref conn } => de.field("conn_id", &conn.get_id()).finish(),
Task::MultiBatch { multi } => de.field("multibatch", &multi.len()).finish(),
Task::MinTS { ref min_ts } => de.field("min_ts", min_ts).finish(),
Task::ResolverReady { ref region_id, .. } => de.field("region_id", region_id).finish(),
Task::IncrementalScan {
ref region_id,
ref downstream_id,
ref entries,
} => de
.field("region_id", ®ion_id)
.field("downstream", &downstream_id)
.field("scan_entries", &entries.len())
.finish(),
Task::Validate(region_id, _) => de.field("region_id", ®ion_id).finish(),
}
}
}
pub struct Endpoint<T> {
capture_regions: HashMap<u64, Delegate>,
connections: HashMap<ConnID, Conn>,
scheduler: Scheduler<Task>,
raft_router: T,
observer: CdcObserver,
pd_client: Arc<dyn PdClient>,
timer: SteadyTimer,
min_ts_interval: Duration,
scan_batch_size: usize,
workers: ThreadPool,
}
impl<T: CasualRouter<RocksEngine>> Endpoint<T> {
pub fn new(
pd_client: Arc<dyn PdClient>,
scheduler: Scheduler<Task>,
raft_router: T,
observer: CdcObserver,
) -> Endpoint<T> {
let workers = Builder::new().name_prefix("cdcwkr").pool_size(4).build();
let ep = Endpoint {
capture_regions: HashMap::default(),
connections: HashMap::default(),
scheduler,
pd_client,
timer: SteadyTimer::default(),
workers,
raft_router,
observer,
scan_batch_size: 1024,
min_ts_interval: Duration::from_secs(10),
};
ep.register_min_ts_event();
ep
}
pub fn set_min_ts_interval(&mut self, dur: Duration) {
self.min_ts_interval = dur;
}
pub fn set_scan_batch_size(&mut self, scan_batch_size: usize) {
self.scan_batch_size = scan_batch_size;
}
fn on_deregister(
&mut self,
region_id: Option<u64>,
id: Option<DownstreamID>,
conn_id: Option<ConnID>,
err: Option<Error>,
) {
info!("cdc deregister region";
"region_id" => region_id,
"downstream_id" => ?id,
"conn_id" => ?conn_id,
"error" => ?err);
let mut is_last = false;
match (id, err, conn_id) {
(Some(id), err, Some(conn_id)) => {
// The peer wants to deregister
let region_id = region_id.unwrap();
if let Some(delegate) = self.capture_regions.get_mut(®ion_id) {
is_last = delegate.unsubscribe(id, err);
}
if let Some(conn) = self.connections.get_mut(&conn_id) {
conn.unsubscribe(region_id);
}
if is_last {
self.capture_regions.remove(®ion_id);
// Do not continue to observe the events of the region
self.observer.unsubscribe_region(region_id);
}
}
(None, Some(err), None) => {
// Something went wrong, deregister all downstreams of the region.
let region_id = region_id.unwrap();
if let Some(mut delegate) = self.capture_regions.remove(®ion_id) {
delegate.fail(err);
is_last = true;
}
self.connections
.iter_mut()
.for_each(|(_, conn)| conn.unsubscribe(region_id));
if is_last {
// Do not continue to observe the events of the region
self.observer.unsubscribe_region(region_id);
}
}
(None, None, Some(conn_id)) => {
if let Some(conn) = self.connections.remove(&conn_id) {
conn.take_downstreams()
.into_iter()
.for_each(|(region_id, downstream_id)| {
if let Some(delegate) = self.capture_regions.get_mut(®ion_id) {
if delegate.unsubscribe(downstream_id, None) {
self.capture_regions.remove(®ion_id);
// Do not continue to observe the events of the region
self.observer.unsubscribe_region(region_id);
}
}
});
}
}
_ => unreachable!(),
}
}
pub fn on_register(
&mut self,
mut request: ChangeDataRequest,
mut downstream: Downstream,
conn_id: ConnID,
) {
let conn = match self.connections.get_mut(&conn_id) {
Some(conn) => conn,
None => return,
};
downstream.set_sink(conn.get_sink());
if !conn.subscribe(request.get_region_id(), downstream.get_id()) {
downstream.sink_duplicate_error(request.get_region_id());
return;
}
let region_id = request.region_id;
info!("cdc register region"; "region_id" => region_id);
let mut enabled = None;
let delegate = self.capture_regions.entry(region_id).or_insert_with(|| {
let d = Delegate::new(region_id);
enabled = Some(d.enabled());
d
});
let downstream_id = downstream.get_id();
let checkpoint_ts = request.checkpoint_ts;
let sched = self.scheduler.clone();
let workers = self.workers.sender().clone();
let batch_size = self.scan_batch_size;
let init = Initializer {
workers,
sched,
region_id,
downstream_id,
conn_id,
checkpoint_ts: checkpoint_ts.into(),
batch_size,
build_resolver: enabled.is_some(),
};
if !delegate.subscribe(downstream) {
return;
}
let change_cmd = if let Some(enabled) = enabled {
// The region has never been registered.
// Subscribe region role change events.
self.observer.subscribe_region(region_id);
ChangeCmd::RegisterObserver {
region_id,
region_epoch: request.take_region_epoch(),
enabled,
}
} else {
ChangeCmd::Snapshot {
region_id,
region_epoch: request.take_region_epoch(),
}
};
if let Err(e) = self.raft_router.send(
region_id,
CasualMessage::CaptureChange {
cmd: change_cmd,
callback: Callback::Read(Box::new(move |resp: ReadResponse<_>| {
init.on_change_cmd(resp);
})),
},
) {
error!("cdc send capture change cmd failed"; "region_id" => region_id, "error" => ?e);
let deregister = Task::Deregister {
region_id: Some(region_id),
downstream_id: Some(downstream_id),
conn_id: Some(conn_id),
err: Some(Error::Request(e.into())),
};
self.scheduler.schedule(deregister).unwrap();
}
}
pub fn on_multi_batch(&mut self, multi: Vec<CmdBatch>) {
for batch in multi {
let mut has_failed = false;
let region_id = batch.region_id;
if let Some(delegate) = self.capture_regions.get_mut(®ion_id) {
delegate.on_batch(batch);
has_failed = delegate.has_failed();
}
if has_failed {
self.capture_regions.remove(®ion_id);
self.connections
.iter_mut()
.for_each(|(_, conn)| conn.unsubscribe(region_id));
}
}
}
pub fn on_incremental_scan(
&mut self,
region_id: u64,
downstream_id: DownstreamID,
entries: Vec<Option<TxnEntry>>,
) {
if let Some(delegate) = self.capture_regions.get_mut(®ion_id) {
delegate.on_scan(downstream_id, entries);
} else {
warn!("region not found on incremental scan"; "region_id" => region_id);
}
}
fn on_region_ready(&mut self, region_id: u64, resolver: Resolver, region: Region) {
if let Some(delegate) = self.capture_regions.get_mut(®ion_id) {
delegate.on_region_ready(resolver, region);
// Delegate may fail during handling pending batch.
if delegate.has_failed() {
self.capture_regions.remove(®ion_id);
self.connections
.iter_mut()
.for_each(|(_, conn)| conn.unsubscribe(region_id));
}
} else {
warn!("region not found on region ready (finish building resolver)"; "region_id" => region_id);
}
}
fn on_min_ts(&mut self, min_ts: TimeStamp) {
for delegate in self.capture_regions.values_mut() {
delegate.on_min_ts(min_ts);
}
self.register_min_ts_event();
}
fn register_min_ts_event(&self) {
let timeout = self.timer.delay(self.min_ts_interval);
let tso = self.pd_client.get_tso();
let scheduler = self.scheduler.clone();
let fut = tso.join(timeout.map_err(|_| unreachable!())).then(
move |tso: pd_client::Result<(TimeStamp, ())>| {
// Ignore get tso errors since we will retry every `min_ts_interval`.
let (min_ts, _) = tso.unwrap_or((TimeStamp::default(), ()));
match scheduler.schedule(Task::MinTS { min_ts }) {
Ok(_) | Err(ScheduleError::Stopped(_)) => Ok(()),
// Must schedule `MinTS` event otherwise resolved ts can not
// advance normally.
err => panic!(
"failed to schedule min_ts event, min_ts: {}, error: {:?}",
min_ts, err
),
}
},
);
self.pd_client.spawn(Box::new(fut) as _);
}
fn on_open_conn(&mut self, conn: Conn) {
self.connections.insert(conn.get_id(), conn);
}
fn flush_all(&self) {
self.connections.iter().for_each(|(_, conn)| conn.flush());
}
}
struct Initializer {
workers: PoolSender,
sched: Scheduler<Task>,
region_id: u64,
downstream_id: DownstreamID,
conn_id: ConnID,
checkpoint_ts: TimeStamp,
batch_size: usize,
build_resolver: bool,
}
impl Initializer {
fn on_change_cmd(&self, mut resp: ReadResponse<RocksEngine>) {
if let Some(region_snapshot) = resp.snapshot {
assert_eq!(self.region_id, region_snapshot.get_region().get_id());
let region = region_snapshot.get_region().clone();
self.async_incremental_scan(region_snapshot, region);
} else {
assert!(
resp.response.get_header().has_error(),
"no snapshot and no error? {:?}",
resp.response
);
let err = resp.response.take_header().take_error();
let deregister = Task::Deregister {
region_id: Some(self.region_id),
downstream_id: Some(self.downstream_id),
conn_id: Some(self.conn_id),
err: Some(Error::Request(err)),
};
self.sched.schedule(deregister).unwrap();
}
}
fn async_incremental_scan<S: Snapshot + 'static>(&self, snap: S, region: Region) {
let downstream_id = self.downstream_id;
let conn_id = self.conn_id;
let sched = self.sched.clone();
let batch_size = self.batch_size;
let checkpoint_ts = self.checkpoint_ts;
let build_resolver = self.build_resolver;
info!("async incremental scan";
"region_id" => region.get_id(),
"downstream_id" => ?downstream_id);
// spawn the task to a thread pool.
// TODO: Add a cancellation mechanism so that the scanning can be canceled if it doesn't
// finish when the region is deregistered.
let region_id = region.get_id();
self.workers
.spawn(lazy(move || {
let mut resolver = if build_resolver {
Some(Resolver::new())
} else {
None
};
fail_point!("cdc_incremental_scan_start");
// Time range: (checkpoint_ts, current]
let current = TimeStamp::max();
let mut scanner = ScannerBuilder::new(snap, current, false)
.range(None, None)
.build_delta_scanner(checkpoint_ts)
.unwrap();
let mut done = false;
while !done {
let entries =
match Self::scan_batch(&mut scanner, batch_size, resolver.as_mut()) {
Ok(res) => res,
Err(e) => {
error!("cdc scan entries failed"; "error" => ?e);
// TODO: record in metrics.
if let Err(e) = sched.schedule(Task::Deregister {
region_id: Some(region_id),
downstream_id: Some(downstream_id),
conn_id: Some(conn_id),
err: Some(e),
}) {
error!("schedule task failed"; "error" => ?e);
}
return Ok(());
}
};
// If the last element is None, it means scanning is finished.
if let Some(None) = entries.last() {
done = true;
}
debug!("cdc scan entries"; "len" => entries.len());
fail_point!("before_schedule_incremental_scan");
let scanned = Task::IncrementalScan {
region_id,
downstream_id,
entries,
};
if let Err(e) = sched.schedule(scanned) {
error!("schedule task failed"; "error" => ?e);
return Ok(());
}
}
if let Some(resolver) = resolver {
Self::finish_building_resolver(resolver, region, sched);
}
Ok(())
}))
.unwrap();
}
fn scan_batch<S: Snapshot>(
scanner: &mut DeltaScanner<S>,
batch_size: usize,
resolver: Option<&mut Resolver>,
) -> Result<Vec<Option<TxnEntry>>> {
let mut entries = Vec::with_capacity(batch_size);
while entries.len() < entries.capacity() {
match scanner.next_entry()? {
Some(entry) => {
entries.push(Some(entry));
}
None => {
entries.push(None);
break;
}
}
}
if let Some(resolver) = resolver {
// Track the locks.
for entry in &entries {
if let Some(TxnEntry::Prewrite { lock, .. }) = entry {
let (encoded_key, value) = lock;
let key = Key::from_encoded_slice(encoded_key).into_raw().unwrap();
let lock = Lock::parse(value)?;
resolver.track_lock(lock.ts, key);
}
}
}
Ok(entries)
}
fn finish_building_resolver(mut resolver: Resolver, region: Region, sched: Scheduler<Task>) {
resolver.init();
if resolver.locks().is_empty() {
info!(
"no lock found";
"region_id" => region.get_id()
);
} else {
let rts = resolver.resolve(TimeStamp::zero());
info!(
"resolver initialized";
"region_id" => region.get_id(),
"resolved_ts" => rts,
"lock_count" => resolver.locks().len()
);
}
info!("schedule resolver ready"; "region_id" => region.get_id());
if let Err(e) = sched.schedule(Task::ResolverReady {
region_id: region.get_id(),
resolver,
region,
}) {
error!("schedule task failed"; "error" => ?e);
}
}
}
impl<T: CasualRouter<RocksEngine>> Runnable<Task> for Endpoint<T> {
fn run(&mut self, task: Task) {
debug!("run cdc task"; "task" => %task);
match task {
Task::MinTS { min_ts } => self.on_min_ts(min_ts),
Task::Register {
request,
downstream,
conn_id,
} => self.on_register(request, downstream, conn_id),
Task::ResolverReady {
region_id,
resolver,
region,
} => self.on_region_ready(region_id, resolver, region),
Task::Deregister {
region_id,
downstream_id,
conn_id,
err,
} => self.on_deregister(region_id, downstream_id, conn_id, err),
Task::IncrementalScan {
region_id,
downstream_id,
entries,
} => {
self.on_incremental_scan(region_id, downstream_id, entries);
}
Task::MultiBatch { multi } => self.on_multi_batch(multi),
Task::OpenConn { conn } => self.on_open_conn(conn),
Task::Validate(region_id, validate) => {
validate(self.capture_regions.get(®ion_id));
}
}
self.flush_all();
}
}
#[cfg(test)]
mod tests {
use super::*;
use engine_traits::DATA_CFS;
use kvproto::kvrpcpb::Context;
use std::collections::BTreeMap;
use std::fmt::Display;
use std::sync::mpsc::{channel, Receiver, RecvTimeoutError, Sender};
use tempfile::TempDir;
use tikv::storage::kv::Engine;
use tikv::storage::mvcc::tests::*;
use tikv::storage::TestEngineBuilder;
use tikv_util::collections::HashSet;
use tikv_util::worker::{Builder as WorkerBuilder, Worker};
struct ReceiverRunnable<T> {
tx: Sender<T>,
}
impl<T: Display> Runnable<T> for ReceiverRunnable<T> {
fn run(&mut self, task: T) {
self.tx.send(task).unwrap();
}
}
fn new_receiver_worker<T: Display + Send + 'static>() -> (Worker<T>, Receiver<T>) {
let (tx, rx) = channel();
let runnable = ReceiverRunnable { tx };
let mut worker = WorkerBuilder::new("test-receiver-worker").create();
worker.start(runnable).unwrap();
(worker, rx)
}
fn mock_initializer() -> (Worker<Task>, ThreadPool, Initializer, Receiver<Task>) {
let (receiver_worker, rx) = new_receiver_worker();
let pool = Builder::new()
.name_prefix("test-initializer-worker")
.pool_size(4)
.build();
let initializer = Initializer {
workers: pool.sender().clone(),
sched: receiver_worker.scheduler(),
region_id: 1,
downstream_id: DownstreamID::new(),
conn_id: ConnID::new(),
checkpoint_ts: 1.into(),
batch_size: 1,
build_resolver: true,
};
(receiver_worker, pool, initializer, rx)
}
#[test]
fn test_initializer_build_resolver() {
let (mut worker, _pool, mut initializer, rx) = mock_initializer();
let temp = TempDir::new().unwrap();
let engine = TestEngineBuilder::new()
.path(temp.path())
.cfs(DATA_CFS)
.build()
.unwrap();
let mut expected_locks = BTreeMap::<TimeStamp, HashSet<Vec<u8>>>::new();
for i in 10..100 {
let (k, v) = (&[b'k', i], &[b'v', i]);
let ts = TimeStamp::new(i as _);
must_prewrite_put(&engine, k, v, k, ts);
expected_locks.entry(ts).or_default().insert(k.to_vec());
}
let region = Region::default();
let snap = engine.snapshot(&Context::default()).unwrap();
let check_result = || loop {
let task = rx.recv().unwrap();
match task {
Task::ResolverReady { resolver, .. } => {
assert_eq!(resolver.locks(), &expected_locks);
return;
}
Task::IncrementalScan { .. } => continue,
t => panic!("unepxected task {} received", t),
}
};
initializer.async_incremental_scan(snap.clone(), region.clone());
check_result();
initializer.batch_size = 1000;
initializer.async_incremental_scan(snap.clone(), region.clone());
check_result();
initializer.batch_size = 10;
initializer.async_incremental_scan(snap.clone(), region.clone());
check_result();
initializer.batch_size = 11;
initializer.async_incremental_scan(snap.clone(), region.clone());
check_result();
initializer.build_resolver = false;
initializer.async_incremental_scan(snap, region);
loop {
let task = rx.recv_timeout(Duration::from_secs(1));
match task {
Ok(Task::IncrementalScan { .. }) => continue,
Ok(t) => panic!("unepxected task {} received", t),
Err(RecvTimeoutError::Timeout) => break,
Err(e) => panic!("unexpected err {:?}", e),
}
}
worker.stop().unwrap().join().unwrap();
}
}