/
PDClient.java
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/
PDClient.java
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/*
* Copyright 2017 PingCAP, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.pingcap.tikv;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.pingcap.tikv.operation.PDErrorHandler.getRegionResponseErrorExtractor;
import static com.pingcap.tikv.pd.PDError.buildFromPdpbError;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.net.HostAndPort;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.google.protobuf.ByteString;
import com.pingcap.tikv.codec.Codec.BytesCodec;
import com.pingcap.tikv.codec.CodecDataOutput;
import com.pingcap.tikv.exception.GrpcException;
import com.pingcap.tikv.exception.TiClientInternalException;
import com.pingcap.tikv.kvproto.Kvrpcpb.IsolationLevel;
import com.pingcap.tikv.kvproto.Metapb.Store;
import com.pingcap.tikv.kvproto.PDGrpc;
import com.pingcap.tikv.kvproto.PDGrpc.PDBlockingStub;
import com.pingcap.tikv.kvproto.PDGrpc.PDStub;
import com.pingcap.tikv.kvproto.Pdpb.GetMembersRequest;
import com.pingcap.tikv.kvproto.Pdpb.GetMembersResponse;
import com.pingcap.tikv.kvproto.Pdpb.GetRegionByIDRequest;
import com.pingcap.tikv.kvproto.Pdpb.GetRegionRequest;
import com.pingcap.tikv.kvproto.Pdpb.GetRegionResponse;
import com.pingcap.tikv.kvproto.Pdpb.GetStoreRequest;
import com.pingcap.tikv.kvproto.Pdpb.GetStoreResponse;
import com.pingcap.tikv.kvproto.Pdpb.RequestHeader;
import com.pingcap.tikv.kvproto.Pdpb.Timestamp;
import com.pingcap.tikv.kvproto.Pdpb.TsoRequest;
import com.pingcap.tikv.kvproto.Pdpb.TsoResponse;
import com.pingcap.tikv.meta.TiTimestamp;
import com.pingcap.tikv.operation.PDErrorHandler;
import com.pingcap.tikv.region.TiRegion;
import com.pingcap.tikv.util.BackOffer;
import com.pingcap.tikv.util.FutureObserver;
import io.grpc.ManagedChannel;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
public class PDClient extends AbstractGRPCClient<PDBlockingStub, PDStub>
implements ReadOnlyPDClient {
private RequestHeader header;
private TsoRequest tsoReq;
private volatile LeaderWrapper leaderWrapper;
private ScheduledExecutorService service;
private IsolationLevel isolationLevel;
private List<HostAndPort> pdAddrs;
@Override
public TiTimestamp getTimestamp(BackOffer backOffer) {
Supplier<TsoRequest> request = () -> tsoReq;
PDErrorHandler<TsoResponse> handler =
new PDErrorHandler<>(
r -> r.getHeader().hasError() ? buildFromPdpbError(r.getHeader().getError()) : null,
this);
TsoResponse resp = callWithRetry(backOffer, PDGrpc.METHOD_TSO, request, handler);
Timestamp timestamp = resp.getTimestamp();
return new TiTimestamp(timestamp.getPhysical(), timestamp.getLogical());
}
@Override
public TiRegion getRegionByKey(BackOffer backOffer, ByteString key) {
CodecDataOutput cdo = new CodecDataOutput();
BytesCodec.writeBytes(cdo, key.toByteArray());
ByteString encodedKey = cdo.toByteString();
Supplier<GetRegionRequest> request =
() -> GetRegionRequest.newBuilder().setHeader(header).setRegionKey(encodedKey).build();
PDErrorHandler<GetRegionResponse> handler =
new PDErrorHandler<>(getRegionResponseErrorExtractor, this);
GetRegionResponse resp = callWithRetry(backOffer, PDGrpc.METHOD_GET_REGION, request, handler);
return new TiRegion(
resp.getRegion(), resp.getLeader(), conf.getIsolationLevel(), conf.getCommandPriority());
}
@Override
public Future<TiRegion> getRegionByKeyAsync(BackOffer backOffer, ByteString key) {
FutureObserver<TiRegion, GetRegionResponse> responseObserver =
new FutureObserver<>(
resp ->
new TiRegion(
resp.getRegion(),
resp.getLeader(),
conf.getIsolationLevel(),
conf.getCommandPriority()));
Supplier<GetRegionRequest> request =
() -> GetRegionRequest.newBuilder().setHeader(header).setRegionKey(key).build();
PDErrorHandler<GetRegionResponse> handler =
new PDErrorHandler<>(getRegionResponseErrorExtractor, this);
callAsyncWithRetry(backOffer, PDGrpc.METHOD_GET_REGION, request, responseObserver, handler);
return responseObserver.getFuture();
}
@Override
public TiRegion getRegionByID(BackOffer backOffer, long id) {
Supplier<GetRegionByIDRequest> request =
() -> GetRegionByIDRequest.newBuilder().setHeader(header).setRegionId(id).build();
PDErrorHandler<GetRegionResponse> handler =
new PDErrorHandler<>(getRegionResponseErrorExtractor, this);
GetRegionResponse resp =
callWithRetry(backOffer, PDGrpc.METHOD_GET_REGION_BY_ID, request, handler);
// Instead of using default leader instance, explicitly set no leader to null
return new TiRegion(
resp.getRegion(), resp.getLeader(), conf.getIsolationLevel(), conf.getCommandPriority());
}
@Override
public Future<TiRegion> getRegionByIDAsync(BackOffer backOffer, long id) {
FutureObserver<TiRegion, GetRegionResponse> responseObserver =
new FutureObserver<>(
resp ->
new TiRegion(
resp.getRegion(),
resp.getLeader(),
conf.getIsolationLevel(),
conf.getCommandPriority()));
Supplier<GetRegionByIDRequest> request =
() -> GetRegionByIDRequest.newBuilder().setHeader(header).setRegionId(id).build();
PDErrorHandler<GetRegionResponse> handler =
new PDErrorHandler<>(getRegionResponseErrorExtractor, this);
callAsyncWithRetry(
backOffer, PDGrpc.METHOD_GET_REGION_BY_ID, request, responseObserver, handler);
return responseObserver.getFuture();
}
@Override
public Store getStore(BackOffer backOffer, long storeId) {
Supplier<GetStoreRequest> request =
() -> GetStoreRequest.newBuilder().setHeader(header).setStoreId(storeId).build();
PDErrorHandler<GetStoreResponse> handler =
new PDErrorHandler<>(
r -> r.getHeader().hasError() ? buildFromPdpbError(r.getHeader().getError()) : null,
this);
GetStoreResponse resp = callWithRetry(backOffer, PDGrpc.METHOD_GET_STORE, request, handler);
return resp.getStore();
}
@Override
public Future<Store> getStoreAsync(BackOffer backOffer, long storeId) {
FutureObserver<Store, GetStoreResponse> responseObserver =
new FutureObserver<>(GetStoreResponse::getStore);
Supplier<GetStoreRequest> request =
() -> GetStoreRequest.newBuilder().setHeader(header).setStoreId(storeId).build();
PDErrorHandler<GetStoreResponse> handler =
new PDErrorHandler<>(
r -> r.getHeader().hasError() ? buildFromPdpbError(r.getHeader().getError()) : null,
this);
callAsyncWithRetry(backOffer, PDGrpc.METHOD_GET_STORE, request, responseObserver, handler);
return responseObserver.getFuture();
}
@Override
public void close() throws InterruptedException {
if (service != null) {
service.shutdownNow();
}
if (getLeaderWrapper() != null) {
getLeaderWrapper().close();
}
}
public static ReadOnlyPDClient create(TiSession session) {
return createRaw(session);
}
@VisibleForTesting
RequestHeader getHeader() {
return header;
}
@VisibleForTesting
LeaderWrapper getLeaderWrapper() {
return leaderWrapper;
}
class LeaderWrapper {
private final String leaderInfo;
private final PDBlockingStub blockingStub;
private final PDStub asyncStub;
private final long createTime;
LeaderWrapper(
String leaderInfo,
PDGrpc.PDBlockingStub blockingStub,
PDGrpc.PDStub asyncStub,
long createTime) {
this.leaderInfo = leaderInfo;
this.blockingStub = blockingStub;
this.asyncStub = asyncStub;
this.createTime = createTime;
}
String getLeaderInfo() {
return leaderInfo;
}
PDBlockingStub getBlockingStub() {
return blockingStub;
}
PDStub getAsyncStub() {
return asyncStub;
}
long getCreateTime() {
return createTime;
}
void close() {}
}
public GetMembersResponse getMembers(HostAndPort url) {
try {
ManagedChannel probChan = session.getChannel(url.getHostText() + ":" + url.getPort());
PDGrpc.PDBlockingStub stub = PDGrpc.newBlockingStub(probChan);
GetMembersRequest request =
GetMembersRequest.newBuilder().setHeader(RequestHeader.getDefaultInstance()).build();
return stub.getMembers(request);
} catch (Exception e) {
logger.warn("failed to get member from pd server.", e);
}
return null;
}
private synchronized boolean switchLeader(List<String> leaderURLs) {
if (leaderURLs.isEmpty()) return false;
String leaderUrlStr = leaderURLs.get(0);
// TODO: Why not strip protocol info on server side since grpc does not need it
if (leaderWrapper != null && leaderUrlStr.equals(leaderWrapper.getLeaderInfo())) {
return true;
}
// switch leader
return createLeaderWrapper(leaderUrlStr);
}
private boolean createLeaderWrapper(String leaderUrlStr) {
try {
URL tURL = new URL(leaderUrlStr);
HostAndPort newLeader = HostAndPort.fromParts(tURL.getHost(), tURL.getPort());
leaderUrlStr = newLeader.toString();
if (leaderWrapper != null && leaderUrlStr.equals(leaderWrapper.getLeaderInfo())) {
return true;
}
// create new Leader
ManagedChannel clientChannel = session.getChannel(leaderUrlStr);
leaderWrapper =
new LeaderWrapper(
leaderUrlStr,
PDGrpc.newBlockingStub(clientChannel),
PDGrpc.newStub(clientChannel),
System.nanoTime());
} catch (MalformedURLException e) {
logger.error("Error updating leader.", e);
return false;
}
logger.info(String.format("Switched to new leader: %s", leaderWrapper));
return true;
}
public void updateLeader() {
for (HostAndPort url : this.pdAddrs) {
// since resp is null, we need update leader's address by walking through all pd server.
GetMembersResponse resp = getMembers(url);
if (resp == null) {
continue;
}
// if leader is switched, just return.
if (switchLeader(resp.getLeader().getClientUrlsList())) {
return;
}
}
throw new TiClientInternalException(
"already tried all address on file, but not leader found yet.");
}
@Override
protected PDBlockingStub getBlockingStub() {
if (leaderWrapper == null) {
throw new GrpcException("PDClient may not be initialized");
}
return leaderWrapper
.getBlockingStub()
.withDeadlineAfter(getConf().getTimeout(), getConf().getTimeoutUnit());
}
@Override
protected PDStub getAsyncStub() {
if (leaderWrapper == null) {
throw new GrpcException("PDClient may not be initialized");
}
return leaderWrapper
.getAsyncStub()
.withDeadlineAfter(getConf().getTimeout(), getConf().getTimeoutUnit());
}
private PDClient(TiSession session) {
super(session);
}
private void initCluster() {
GetMembersResponse resp = null;
List<HostAndPort> pdAddrs = getSession().getConf().getPdAddrs();
for (HostAndPort u : pdAddrs) {
resp = getMembers(u);
if (resp != null) {
break;
}
}
checkNotNull(resp, "Failed to init client for PD cluster.");
long clusterId = resp.getHeader().getClusterId();
header = RequestHeader.newBuilder().setClusterId(clusterId).build();
tsoReq = TsoRequest.newBuilder().setHeader(header).setCount(1).build();
this.pdAddrs = pdAddrs;
createLeaderWrapper(resp.getLeader().getClientUrls(0));
service =
Executors.newSingleThreadScheduledExecutor(
new ThreadFactoryBuilder().setDaemon(true).build());
service.scheduleAtFixedRate(
() -> {
// Wrap this with a try catch block in case schedule update fails
try {
updateLeader();
} catch (Exception e) {
logger.warn("Update leader failed", e);
}
},
1,
1,
TimeUnit.MINUTES);
}
static PDClient createRaw(TiSession session) {
PDClient client = null;
try {
client = new PDClient(session);
client.initCluster();
} catch (Exception e) {
if (client != null) {
try {
client.close();
} catch (InterruptedException ignore) {
}
}
throw e;
}
return client;
}
}