/
sst_service.rs
1164 lines (1073 loc) · 40.7 KB
/
sst_service.rs
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// Copyright 2018 TiKV Project Authors. Licensed under Apache-2.0.
use std::{
collections::HashMap,
future::Future,
path::PathBuf,
sync::{Arc, Mutex},
};
use collections::HashSet;
use engine_traits::{KvEngine, CF_DEFAULT, CF_WRITE};
use file_system::{set_io_type, IOType};
use futures::{
executor::{ThreadPool, ThreadPoolBuilder},
future::join_all,
sink::SinkExt,
stream::TryStreamExt,
TryFutureExt,
};
use grpcio::{
ClientStreamingSink, RequestStream, RpcContext, ServerStreamingSink, UnarySink, WriteFlags,
};
use kvproto::{
encryptionpb::EncryptionMethod,
errorpb,
import_sstpb::{RawWriteRequest_oneof_chunk as RawChunk, WriteRequest_oneof_chunk as Chunk, *},
kvrpcpb::Context,
raft_cmdpb::*,
};
use protobuf::Message;
use raftstore::{
router::RaftStoreRouter,
store::{Callback, RaftCmdExtraOpts, RegionSnapshot},
};
use sst_importer::{error_inc, metrics::*, sst_meta_to_path, Config, Error, Result, SstImporter};
use tikv_util::{
config::ReadableSize,
future::{create_stream_with_buffer, paired_future_callback},
time::{Instant, Limiter},
};
use txn_types::{Key, WriteRef, WriteType};
use super::make_rpc_error;
use crate::{import::duplicate_detect::DuplicateDetector, server::CONFIG_ROCKSDB_GAUGE};
/// ImportSstService provides tikv-server with the ability to ingest SST files.
///
/// It saves the SST sent from client to a file and then sends a command to
/// raftstore to trigger the ingest process.
#[derive(Clone)]
pub struct ImportSstService<E, Router>
where
E: KvEngine,
{
cfg: Config,
engine: E,
router: Router,
threads: ThreadPool,
importer: Arc<SstImporter>,
limiter: Limiter,
task_slots: Arc<Mutex<HashSet<PathBuf>>>,
raft_entry_max_size: ReadableSize,
}
pub struct SnapshotResult<E: KvEngine> {
snapshot: RegionSnapshot<E::Snapshot>,
term: u64,
}
impl<E, Router> ImportSstService<E, Router>
where
E: KvEngine,
Router: 'static + RaftStoreRouter<E>,
{
pub fn new(
cfg: Config,
raft_entry_max_size: ReadableSize,
router: Router,
engine: E,
importer: Arc<SstImporter>,
) -> ImportSstService<E, Router> {
let props = tikv_util::thread_group::current_properties();
let threads = ThreadPoolBuilder::new()
.pool_size(cfg.num_threads)
.name_prefix("sst-importer")
.after_start(move |_| {
tikv_util::thread_group::set_properties(props.clone());
tikv_alloc::add_thread_memory_accessor();
set_io_type(IOType::Import);
})
.before_stop(move |_| tikv_alloc::remove_thread_memory_accessor())
.create()
.unwrap();
importer.start_switch_mode_check(&threads, engine.clone());
ImportSstService {
cfg,
engine,
threads,
router,
importer,
limiter: Limiter::new(f64::INFINITY),
task_slots: Arc::new(Mutex::new(HashSet::default())),
raft_entry_max_size,
}
}
fn acquire_lock(task_slots: &Arc<Mutex<HashSet<PathBuf>>>, meta: &SstMeta) -> Result<bool> {
let mut slots = task_slots.lock().unwrap();
let p = sst_meta_to_path(meta)?;
Ok(slots.insert(p))
}
fn release_lock(task_slots: &Arc<Mutex<HashSet<PathBuf>>>, meta: &SstMeta) -> Result<bool> {
let mut slots = task_slots.lock().unwrap();
let p = sst_meta_to_path(meta)?;
Ok(slots.remove(&p))
}
async fn async_snapshot(
router: Router,
header: RaftRequestHeader,
) -> std::result::Result<SnapshotResult<E>, errorpb::Error> {
let mut req = Request::default();
req.set_cmd_type(CmdType::Snap);
let mut cmd = RaftCmdRequest::default();
cmd.set_header(header);
cmd.set_requests(vec![req].into());
let (cb, future) = paired_future_callback();
if let Err(e) = router.send_command(cmd, Callback::Read(cb), RaftCmdExtraOpts::default()) {
return Err(e.into());
}
let mut res = future.await.map_err(|_| {
let mut err = errorpb::Error::default();
let err_str = "too many sst files are ingesting";
let mut server_is_busy_err = errorpb::ServerIsBusy::default();
server_is_busy_err.set_reason(err_str.to_string());
err.set_message(err_str.to_string());
err.set_server_is_busy(server_is_busy_err);
err
})?;
let mut header = res.response.take_header();
if header.has_error() {
return Err(header.take_error());
}
Ok(SnapshotResult {
snapshot: res.snapshot.unwrap(),
term: header.get_current_term(),
})
}
fn check_write_stall(&self) -> Option<errorpb::Error> {
if self.importer.get_mode() == SwitchMode::Normal
&& self
.engine
.ingest_maybe_slowdown_writes(CF_WRITE)
.expect("cf")
{
let mut errorpb = errorpb::Error::default();
let err = "too many sst files are ingesting";
let mut server_is_busy_err = errorpb::ServerIsBusy::default();
server_is_busy_err.set_reason(err.to_string());
errorpb.set_message(err.to_string());
errorpb.set_server_is_busy(server_is_busy_err);
return Some(errorpb);
}
None
}
fn ingest_files(
&self,
context: Context,
label: &'static str,
ssts: Vec<SstMeta>,
) -> impl Future<Output = Result<IngestResponse>> {
let header = make_request_header(context);
let snapshot_res = Self::async_snapshot(self.router.clone(), header.clone());
let router = self.router.clone();
let importer = self.importer.clone();
async move {
// check api version
if !importer.as_ref().check_api_version(&ssts)? {
return Err(Error::IncompatibleApiVersion);
}
let mut resp = IngestResponse::default();
let res = match snapshot_res.await {
Ok(snap) => snap,
Err(e) => {
pb_error_inc(label, &e);
resp.set_error(e);
return Ok(resp);
}
};
fail_point!("import::sst_service::ingest");
// Make ingest command.
let mut cmd = RaftCmdRequest::default();
cmd.set_header(header);
cmd.mut_header().set_term(res.term);
for sst in ssts.iter() {
let mut ingest = Request::default();
ingest.set_cmd_type(CmdType::IngestSst);
ingest.mut_ingest_sst().set_sst(sst.clone());
cmd.mut_requests().push(ingest);
}
// Here we shall check whether the file has been ingested before. This operation
// must execute after geting a snapshot from raftstore to make sure that the
// current leader has applied to current term.
for sst in ssts.iter() {
if !importer.exist(sst) {
warn!(
"sst [{:?}] not exist. we may retry an operation that has already succeeded",
sst
);
let mut errorpb = errorpb::Error::default();
let err = "The file which would be ingested doest not exist.";
let stale_err = errorpb::StaleCommand::default();
errorpb.set_message(err.to_string());
errorpb.set_stale_command(stale_err);
resp.set_error(errorpb);
return Ok(resp);
}
}
let (cb, future) = paired_future_callback();
if let Err(e) =
router.send_command(cmd, Callback::write(cb), RaftCmdExtraOpts::default())
{
resp.set_error(e.into());
return Ok(resp);
}
let mut res = future.await.map_err(Error::from)?;
let mut header = res.response.take_header();
if header.has_error() {
pb_error_inc(label, header.get_error());
resp.set_error(header.take_error());
}
Ok(resp)
}
}
}
#[macro_export]
macro_rules! impl_write {
($fn:ident, $req_ty:ident, $resp_ty:ident, $chunk_ty:ident, $writer_fn:ident) => {
fn $fn(
&mut self,
_ctx: RpcContext<'_>,
stream: RequestStream<$req_ty>,
sink: ClientStreamingSink<$resp_ty>,
) {
let import = self.importer.clone();
let engine = self.engine.clone();
let (rx, buf_driver) =
create_stream_with_buffer(stream, self.cfg.stream_channel_window);
let mut rx = rx.map_err(Error::from);
let timer = Instant::now_coarse();
let label = stringify!($fn);
let handle_task = async move {
let res = async move {
let first_req = rx.try_next().await?;
let meta = match first_req {
Some(r) => match r.chunk {
Some($chunk_ty::Meta(m)) => m,
_ => return Err(Error::InvalidChunk),
},
_ => return Err(Error::InvalidChunk),
};
let writer = match import.$writer_fn(&engine, meta) {
Ok(w) => w,
Err(e) => {
error!("build writer failed {:?}", e);
return Err(Error::InvalidChunk);
}
};
let writer = rx
.try_fold(writer, |mut writer, req| async move {
let batch = match req.chunk {
Some($chunk_ty::Batch(b)) => b,
_ => return Err(Error::InvalidChunk),
};
writer.write(batch)?;
Ok(writer)
})
.await?;
let metas = writer.finish()?;
import.verify_checksum(&metas)?;
let mut resp = $resp_ty::default();
resp.set_metas(metas.into());
Ok(resp)
}
.await;
$crate::send_rpc_response!(res, sink, label, timer);
};
self.threads.spawn_ok(buf_driver);
self.threads.spawn_ok(handle_task);
}
};
}
impl<E, Router> ImportSst for ImportSstService<E, Router>
where
E: KvEngine,
Router: 'static + RaftStoreRouter<E>,
{
fn switch_mode(
&mut self,
ctx: RpcContext<'_>,
req: SwitchModeRequest,
sink: UnarySink<SwitchModeResponse>,
) {
let label = "switch_mode";
let timer = Instant::now_coarse();
let res = {
fn mf(cf: &str, name: &str, v: f64) {
CONFIG_ROCKSDB_GAUGE.with_label_values(&[cf, name]).set(v);
}
match req.get_mode() {
SwitchMode::Normal => self.importer.enter_normal_mode(self.engine.clone(), mf),
SwitchMode::Import => self.importer.enter_import_mode(self.engine.clone(), mf),
}
};
match res {
Ok(_) => info!("switch mode"; "mode" => ?req.get_mode()),
Err(ref e) => error!(%*e; "switch mode failed"; "mode" => ?req.get_mode(),),
}
let task = async move {
let res = Ok(SwitchModeResponse::default());
crate::send_rpc_response!(res, sink, label, timer);
};
ctx.spawn(task);
}
/// Receive SST from client and save the file for later ingesting.
fn upload(
&mut self,
_ctx: RpcContext<'_>,
stream: RequestStream<UploadRequest>,
sink: ClientStreamingSink<UploadResponse>,
) {
let label = "upload";
let timer = Instant::now_coarse();
let import = self.importer.clone();
let (rx, buf_driver) = create_stream_with_buffer(stream, self.cfg.stream_channel_window);
let mut map_rx = rx.map_err(Error::from);
let handle_task = async move {
// So stream will not be dropped until response is sent.
let rx = &mut map_rx;
let res = async move {
let first_chunk = rx.try_next().await?;
let meta = match first_chunk {
Some(ref chunk) if chunk.has_meta() => chunk.get_meta(),
_ => return Err(Error::InvalidChunk),
};
let file = import.create(meta)?;
let mut file = rx
.try_fold(file, |mut file, chunk| async move {
let start = Instant::now_coarse();
let data = chunk.get_data();
if data.is_empty() {
return Err(Error::InvalidChunk);
}
file.append(data)?;
IMPORT_UPLOAD_CHUNK_BYTES.observe(data.len() as f64);
IMPORT_UPLOAD_CHUNK_DURATION.observe(start.saturating_elapsed_secs());
Ok(file)
})
.await?;
file.finish().map(|_| UploadResponse::default())
}
.await;
crate::send_rpc_response!(res, sink, label, timer);
};
self.threads.spawn_ok(buf_driver);
self.threads.spawn_ok(handle_task);
}
// clear_files the KV files after apply finished.
// it will remove the direcotry in import path.
fn clear_files(
&mut self,
_ctx: RpcContext<'_>,
req: ClearRequest,
sink: UnarySink<ClearResponse>,
) {
let label = "clear_files";
let timer = Instant::now_coarse();
let importer = Arc::clone(&self.importer);
let start = Instant::now();
let mut resp = ClearResponse::default();
let handle_task = async move {
// Records how long the apply task waits to be scheduled.
sst_importer::metrics::IMPORTER_APPLY_DURATION
.with_label_values(&["queue"])
.observe(start.saturating_elapsed().as_secs_f64());
if let Err(e) = importer.remove_dir(req.get_prefix()) {
let mut import_err = kvproto::import_sstpb::Error::default();
import_err.set_message(format!("failed to remove directory: {}", e));
resp.set_error(import_err);
}
sst_importer::metrics::IMPORTER_APPLY_DURATION
.with_label_values(&[label])
.observe(start.saturating_elapsed().as_secs_f64());
let resp = Ok(resp);
crate::send_rpc_response!(resp, sink, label, timer);
};
self.threads.spawn_ok(handle_task);
}
// Downloads KV file and performs key-rewrite then apply kv into this tikv store.
fn apply(
&mut self,
_ctx: RpcContext<'_>,
mut req: ApplyRequest,
sink: UnarySink<ApplyResponse>,
) {
let label = "apply";
let timer = Instant::now_coarse();
let importer = Arc::clone(&self.importer);
let router = self.router.clone();
let limiter = self.limiter.clone();
let start = Instant::now();
let raft_size = self.raft_entry_max_size;
let handle_task = async move {
// Records how long the apply task waits to be scheduled.
sst_importer::metrics::IMPORTER_APPLY_DURATION
.with_label_values(&["queue"])
.observe(start.saturating_elapsed().as_secs_f64());
let mut futs = vec![];
let mut apply_resp = ApplyResponse::default();
let context = req.take_context();
let meta = req.get_meta();
let result = (|| -> Result<()> {
let temp_file =
importer.do_download_kv_file(meta, req.get_storage_backend(), &limiter)?;
let mut reqs = RequestCollector::from_cf(meta.get_cf());
let mut cmd_reqs = vec![];
let mut build_req_fn = build_apply_request(
raft_size.0,
&mut reqs,
cmd_reqs.as_mut(),
meta.get_is_delete(),
meta.get_cf(),
context.clone(),
);
let range = importer.do_apply_kv_file(
meta.get_start_key(),
meta.get_end_key(),
meta.get_restore_ts(),
temp_file,
req.get_rewrite_rule(),
&mut build_req_fn,
)?;
drop(build_req_fn);
if !reqs.is_empty() {
let cmd = make_request(&mut reqs, context);
cmd_reqs.push(cmd);
}
for cmd in cmd_reqs {
let (cb, future) = paired_future_callback();
match router.send_command(cmd, Callback::write(cb), RaftCmdExtraOpts::default())
{
Ok(_) => futs.push(future),
Err(e) => {
let mut import_err = kvproto::import_sstpb::Error::default();
import_err.set_message(format!("failed to send raft command: {}", e));
apply_resp.set_error(import_err);
}
}
}
if let Some(r) = range {
apply_resp.set_range(r);
}
Ok(())
})();
if let Err(e) = result {
apply_resp.set_error(e.into());
}
let resp = Ok(join_all(futs).await.iter().fold(apply_resp, |mut resp, x| {
match x {
Err(e) => {
let mut import_err = kvproto::import_sstpb::Error::default();
import_err.set_message(format!("failed to complete raft command: {}", e));
resp.set_error(import_err);
}
Ok(r) => {
if r.response.get_header().has_error() {
let mut import_err = kvproto::import_sstpb::Error::default();
let err = r.response.get_header().get_error();
import_err
.set_message("failed to complete raft command".to_string());
// FIXME: if there are many errors, we may lose some of them here.
import_err
.set_store_error(err.clone());
warn!("failed to apply the file to the store"; "error" => ?err, "file" => %meta.get_name());
resp.set_error(import_err);
}
}
}
resp
}));
// Records how long the apply task waits to be scheduled.
sst_importer::metrics::IMPORTER_APPLY_DURATION
.with_label_values(&["finish"])
.observe(start.saturating_elapsed().as_secs_f64());
debug!("finished apply kv file with {:?}", resp);
crate::send_rpc_response!(resp, sink, label, timer);
};
self.threads.spawn_ok(handle_task);
}
/// Downloads the file and performs key-rewrite for later ingesting.
fn download(
&mut self,
_ctx: RpcContext<'_>,
req: DownloadRequest,
sink: UnarySink<DownloadResponse>,
) {
let label = "download";
let timer = Instant::now_coarse();
let importer = Arc::clone(&self.importer);
let limiter = self.limiter.clone();
let engine = self.engine.clone();
let start = Instant::now();
let handle_task = async move {
// Records how long the download task waits to be scheduled.
sst_importer::metrics::IMPORTER_DOWNLOAD_DURATION
.with_label_values(&["queue"])
.observe(start.saturating_elapsed().as_secs_f64());
// FIXME: download() should be an async fn, to allow BR to cancel
// a download task.
// Unfortunately, this currently can't happen because the S3Storage
// is not Send + Sync. See the documentation of S3Storage for reason.
let cipher = req
.cipher_info
.to_owned()
.into_option()
.filter(|c| c.cipher_type != EncryptionMethod::Plaintext);
let res = importer.download::<E>(
req.get_sst(),
req.get_storage_backend(),
req.get_name(),
req.get_rewrite_rule(),
cipher,
limiter,
engine,
);
let mut resp = DownloadResponse::default();
match res {
Ok(range) => match range {
Some(r) => resp.set_range(r),
None => resp.set_is_empty(true),
},
Err(e) => resp.set_error(e.into()),
}
let resp = Ok(resp);
crate::send_rpc_response!(resp, sink, label, timer);
};
self.threads.spawn_ok(handle_task);
}
/// Ingest the file by sending a raft command to raftstore.
///
/// If the ingestion fails because the region is not found or the epoch does
/// not match, the remaining files will eventually be cleaned up by
/// CleanupSSTWorker.
fn ingest(
&mut self,
ctx: RpcContext<'_>,
mut req: IngestRequest,
sink: UnarySink<IngestResponse>,
) {
let label = "ingest";
let timer = Instant::now_coarse();
let mut resp = IngestResponse::default();
if let Some(errorpb) = self.check_write_stall() {
resp.set_error(errorpb);
ctx.spawn(
sink.success(resp)
.unwrap_or_else(|e| warn!("send rpc failed"; "err" => %e)),
);
return;
}
let mut errorpb = errorpb::Error::default();
if !Self::acquire_lock(&self.task_slots, req.get_sst()).unwrap_or(false) {
errorpb.set_message(Error::FileConflict.to_string());
resp.set_error(errorpb);
ctx.spawn(
sink.success(resp)
.unwrap_or_else(|e| warn!("send rpc failed"; "err" => %e)),
);
return;
}
let task_slots = self.task_slots.clone();
let meta = req.take_sst();
let f = self.ingest_files(req.take_context(), label, vec![meta.clone()]);
let handle_task = async move {
let res = f.await;
Self::release_lock(&task_slots, &meta).unwrap();
crate::send_rpc_response!(res, sink, label, timer);
};
self.threads.spawn_ok(handle_task);
}
/// Ingest multiple files by sending a raft command to raftstore.
///
fn multi_ingest(
&mut self,
ctx: RpcContext<'_>,
mut req: MultiIngestRequest,
sink: UnarySink<IngestResponse>,
) {
let label = "multi-ingest";
let timer = Instant::now_coarse();
let mut resp = IngestResponse::default();
if let Some(errorpb) = self.check_write_stall() {
resp.set_error(errorpb);
ctx.spawn(
sink.success(resp)
.unwrap_or_else(|e| warn!("send rpc failed"; "err" => %e)),
);
return;
}
let mut errorpb = errorpb::Error::default();
let mut metas = vec![];
for sst in req.get_ssts() {
if Self::acquire_lock(&self.task_slots, sst).unwrap_or(false) {
metas.push(sst.clone());
}
}
if metas.len() < req.get_ssts().len() {
for m in metas {
Self::release_lock(&self.task_slots, &m).unwrap();
}
errorpb.set_message(Error::FileConflict.to_string());
resp.set_error(errorpb);
ctx.spawn(
sink.success(resp)
.unwrap_or_else(|e| warn!("send rpc failed"; "err" => %e)),
);
return;
}
let task_slots = self.task_slots.clone();
let f = self.ingest_files(req.take_context(), label, req.take_ssts().into());
let handle_task = async move {
let res = f.await;
for m in metas {
Self::release_lock(&task_slots, &m).unwrap();
}
crate::send_rpc_response!(res, sink, label, timer);
};
self.threads.spawn_ok(handle_task);
}
fn compact(
&mut self,
_ctx: RpcContext<'_>,
req: CompactRequest,
sink: UnarySink<CompactResponse>,
) {
let label = "compact";
let timer = Instant::now_coarse();
let engine = self.engine.clone();
let handle_task = async move {
let (start, end) = if !req.has_range() {
(None, None)
} else {
(
Some(req.get_range().get_start()),
Some(req.get_range().get_end()),
)
};
let output_level = if req.get_output_level() == -1 {
None
} else {
Some(req.get_output_level())
};
let res = engine.compact_files_in_range(start, end, output_level);
match res {
Ok(_) => info!(
"compact files in range";
"start" => start.map(log_wrappers::Value::key),
"end" => end.map(log_wrappers::Value::key),
"output_level" => ?output_level, "takes" => ?timer.saturating_elapsed()
),
Err(ref e) => error!(%*e;
"compact files in range failed";
"start" => start.map(log_wrappers::Value::key),
"end" => end.map(log_wrappers::Value::key),
"output_level" => ?output_level,
),
}
let res = res
.map_err(|e| Error::Engine(box_err!(e)))
.map(|_| CompactResponse::default());
crate::send_rpc_response!(res, sink, label, timer);
};
self.threads.spawn_ok(handle_task);
}
fn set_download_speed_limit(
&mut self,
ctx: RpcContext<'_>,
req: SetDownloadSpeedLimitRequest,
sink: UnarySink<SetDownloadSpeedLimitResponse>,
) {
let label = "set_download_speed_limit";
let timer = Instant::now_coarse();
let speed_limit = req.get_speed_limit();
self.limiter.set_speed_limit(if speed_limit > 0 {
speed_limit as f64
} else {
f64::INFINITY
});
let ctx_task = async move {
let res = Ok(SetDownloadSpeedLimitResponse::default());
crate::send_rpc_response!(res, sink, label, timer);
};
ctx.spawn(ctx_task);
}
fn duplicate_detect(
&mut self,
_ctx: RpcContext<'_>,
mut request: DuplicateDetectRequest,
mut sink: ServerStreamingSink<DuplicateDetectResponse>,
) {
let label = "duplicate_detect";
let timer = Instant::now_coarse();
let context = request.take_context();
let router = self.router.clone();
let start_key = request.take_start_key();
let min_commit_ts = request.get_min_commit_ts();
let end_key = if request.get_end_key().is_empty() {
None
} else {
Some(request.take_end_key())
};
let key_only = request.get_key_only();
let snap_res = Self::async_snapshot(router, make_request_header(context));
let handle_task = async move {
let res = snap_res.await;
let snapshot = match res {
Ok(snap) => snap.snapshot,
Err(e) => {
let mut resp = DuplicateDetectResponse::default();
pb_error_inc(label, &e);
resp.set_region_error(e);
match sink
.send((resp, WriteFlags::default().buffer_hint(true)))
.await
{
Ok(_) => {
IMPORT_RPC_DURATION
.with_label_values(&[label, "ok"])
.observe(timer.saturating_elapsed_secs());
}
Err(e) => {
warn!(
"connection send message fail";
"err" => %e
);
}
}
let _ = sink.close().await;
return;
}
};
let detector =
DuplicateDetector::new(snapshot, start_key, end_key, min_commit_ts, key_only)
.unwrap();
for resp in detector {
if let Err(e) = sink
.send((resp, WriteFlags::default().buffer_hint(true)))
.await
{
warn!(
"connection send message fail";
"err" => %e
);
break;
}
}
let _ = sink.close().await;
};
self.threads.spawn_ok(handle_task);
}
impl_write!(write, WriteRequest, WriteResponse, Chunk, new_txn_writer);
impl_write!(
raw_write,
RawWriteRequest,
RawWriteResponse,
RawChunk,
new_raw_writer
);
}
// add error statistics from pb error response
fn pb_error_inc(type_: &str, e: &errorpb::Error) {
let label = if e.has_not_leader() {
"not_leader"
} else if e.has_store_not_match() {
"store_not_match"
} else if e.has_region_not_found() {
"region_not_found"
} else if e.has_key_not_in_region() {
"key_not_in_range"
} else if e.has_epoch_not_match() {
"epoch_not_match"
} else if e.has_server_is_busy() {
"server_is_busy"
} else if e.has_stale_command() {
"stale_command"
} else if e.has_raft_entry_too_large() {
"raft_entry_too_large"
} else {
"unknown"
};
IMPORTER_ERROR_VEC.with_label_values(&[type_, label]).inc();
}
enum RequestCollector {
/// Retain the last ts of each key in each request.
/// This is used for write CF because resolved ts observer hates duplicated key in the same request.
RetainLastTs(HashMap<Vec<u8>, (Request, u64)>),
/// Collector favor that simple collect all items.
/// This is used for default CF.
KeepAll(Vec<Request>),
}
impl RequestCollector {
fn from_cf(cf: &str) -> Self {
match cf {
CF_DEFAULT | "" => Self::KeepAll(Default::default()),
CF_WRITE => Self::RetainLastTs(Default::default()),
_ => {
warn!("unknown cf name, using default request collector"; "cf" => %cf);
Self::RetainLastTs(Default::default())
}
}
}
fn accept(&mut self, req: Request) {
match self {
RequestCollector::RetainLastTs(ref mut reqs) => {
let k = key_from_request(&req);
let (encoded_key, ts) = match Key::split_on_ts_for(k) {
Ok(k) => k,
Err(err) => {
warn!("key without ts, skipping"; "key" => %log_wrappers::Value::key(k), "err" => %err);
return;
}
};
if reqs
.get(encoded_key)
.map(|(_, old_ts)| *old_ts < ts.into_inner())
.unwrap_or(true)
{
reqs.insert(encoded_key.to_owned(), (req, ts.into_inner()));
}
}
RequestCollector::KeepAll(ref mut a) => a.push(req),
}
}
fn drain(&mut self) -> Vec<Request> {
match self {
RequestCollector::RetainLastTs(ref mut reqs) => {
reqs.drain().map(|(_, (req, _))| req).collect()
}
RequestCollector::KeepAll(ref mut reqs) => std::mem::take(reqs),
}
}
fn is_empty(&self) -> bool {
match self {
RequestCollector::RetainLastTs(reqs) => reqs.is_empty(),
RequestCollector::KeepAll(reqs) => reqs.is_empty(),
}
}
}
fn key_from_request(req: &Request) -> &[u8] {
if req.has_put() {
return req.get_put().get_key();
}
if req.has_delete() {
return req.get_delete().get_key();
}
warn!("trying to extract key from request is neither put nor delete.");
b""
}
fn make_request_header(mut context: Context) -> RaftRequestHeader {
let region_id = context.get_region_id();
let mut header = RaftRequestHeader::default();
header.set_peer(context.take_peer());
header.set_region_id(region_id);
header.set_region_epoch(context.take_region_epoch());
header
}
fn make_request(reqs: &mut RequestCollector, context: Context) -> RaftCmdRequest {
let mut cmd = RaftCmdRequest::default();
let mut header = make_request_header(context);
// Set the UUID of header to prevent raftstore batching our requests.
// The current `resolved_ts` observer assumes that each batch of request doesn't has
// two writes to the same key. (Even with 2 different TS). That was true for normal cases
// because the latches reject concurrency write to keys. However we have bypassed the latch layer :(
header.set_uuid(uuid::Uuid::new_v4().as_bytes().to_vec());
cmd.set_header(header);
cmd.set_requests(reqs.drain().into());
cmd
}
// we need to remove duplicate keys in here, since
// in https://github.com/tikv/tikv/blob/a401f78bc86f7e6ea6a55ad9f453ae31be835b55/components/resolved_ts/src/cmd.rs#L204
// will panic if found duplicated entry during Vec<PutRequest>.
fn build_apply_request<'a, 'b>(
raft_size: u64,
reqs: &'a mut RequestCollector,
cmd_reqs: &'a mut Vec<RaftCmdRequest>,
is_delete: bool,
cf: &'b str,
context: Context,
) -> Box<dyn FnMut(Vec<u8>, Vec<u8>) + 'b>
where
'a: 'b,
{
let mut req_size = 0_u64;
// use callback to collect kv data.
if is_delete {
Box::new(move |k: Vec<u8>, _v: Vec<u8>| {
let mut req = Request::default();
let mut del = DeleteRequest::default();
del.set_key(k);
del.set_cf(cf.to_string());
req.set_cmd_type(CmdType::Delete);
req.set_delete(del);
req_size += req.compute_size() as u64;
reqs.accept(req);
// When the request size get grow to half of the max request size,
// build the request and add it to a batch.
if req_size > raft_size / 2 {
req_size = 0;
let cmd = make_request(reqs, context.clone());
cmd_reqs.push(cmd);
}
})
} else {
Box::new(move |k: Vec<u8>, v: Vec<u8>| {
if cf == CF_WRITE && !write_needs_restore(&v) {
return;
}
let mut req = Request::default();
let mut put = PutRequest::default();
put.set_key(k);
put.set_value(v);
put.set_cf(cf.to_string());
req.set_cmd_type(CmdType::Put);