Fix globalconfig refresh hang issue

CC sets a version to int_max in ClientDBInfo indicating a refresh, however,
proxy server would reject this version for the error of future_version.

This change fixes this issue by not sending int_max, instead maintaining a
lastKnown in memory and send it to grvproxy to get latest globalconfig.

this change also fixes some java tests that were used to test the fix

bindings/java/src/integration/com/apple/foundationdb/MultiClientHelper.java

@@ -21,15 +21,13 @@ package com.apple.foundationdb;
 
 import java.util.ArrayList;
 import java.util.Collection;
-import org.junit.jupiter.api.extension.AfterEachCallback;
-import org.junit.jupiter.api.extension.BeforeAllCallback;
 import org.junit.jupiter.api.extension.ExtensionContext;
-
+import org.junit.jupiter.api.extension.BeforeAllCallback;
 /**
  * Callback to help define a multi-client scenario and ensure that 
  * the clients can be configured properly.
  */
-public class MultiClientHelper implements BeforeAllCallback,AfterEachCallback{
+public class MultiClientHelper implements BeforeAllCallback {
 	private String[] clusterFiles;
 	private Collection<Database> openDatabases;
 	
@@ -67,16 +65,4 @@ public class MultiClientHelper implements BeforeAllCallback,AfterEachCallback{
 	public void beforeAll(ExtensionContext arg0) throws Exception {
 		clusterFiles = readClusterFromEnv();
 	}
-
-	@Override
-	public void afterEach(ExtensionContext arg0) throws Exception {
-		//close any databases that have been opened	
-		if(openDatabases!=null){
-			for(Database db : openDatabases){
-				db.close();
-			}
-		}
-		openDatabases = null;
-	}
-
 }

fdbclient/GlobalConfig.actor.cpp

@@ -154,8 +154,9 @@ void GlobalConfig::erase(KeyRangeRef range) {
 }
 
 // Updates local copy of global configuration by reading the entire key-range
-// from storage (proxied through the GrvProxies).
-ACTOR Future<Void> GlobalConfig::refresh(GlobalConfig* self, Version lastKnown) {
+// from storage (proxied through the GrvProxies). Returns the version of the
+// refreshed data.
+ACTOR Future<Version> GlobalConfig::refresh(GlobalConfig* self, Version lastKnown, Version largestSeen) {
 	// TraceEvent trace(SevInfo, "GlobalConfigRefresh");
 	self->erase(KeyRangeRef(""_sr, "\xff"_sr));
 
@@ -171,7 +172,11 @@ ACTOR Future<Void> GlobalConfig::refresh(GlobalConfig* self, Version lastKnown)
 				KeyRef systemKey = kv.key.removePrefix(globalConfigKeysPrefix);
 				self->insert(systemKey, kv.value);
 			}
-			return Void();
+			if (reply.version >= largestSeen || largestSeen == std::numeric_limits<Version>::max()) {
+				return reply.version;
+			} else {
+				wait(delay(0.25));
+			}
 		} catch (Error& e) {
 			wait(backoff.onError());
 		}
@@ -186,52 +191,61 @@ ACTOR Future<Void> GlobalConfig::updater(GlobalConfig* self, const ClientDBInfo*
 			if (self->initialized.canBeSet()) {
 				wait(self->cx->onConnected());
 
-				wait(self->refresh(self, -1));
+				Version version = wait(self->refresh(self, -1, 0));
+				self->lastUpdate = version;
+
+				self->cx->addref();
 				self->initialized.send(Void());
+				self->cx->delref();
 			}
 
 			loop {
 				try {
-					wait(self->dbInfoChanged.onTrigger());
-
-					auto& history = dbInfo->history;
-					if (history.size() == 0) {
-						continue;
-					}
-
-					if (self->lastUpdate < history[0].version) {
-						// This process missed too many global configuration
-						// history updates or the protocol version changed, so it
-						// must re-read the entire configuration range.
-						wait(self->refresh(self, history.back().version));
-						if (dbInfo->history.size() > 0) {
-							self->lastUpdate = dbInfo->history.back().version;
-						}
-					} else {
-						// Apply history in order, from lowest version to highest
-						// version. Mutation history should already be stored in
-						// ascending version order.
-						for (const auto& vh : history) {
-							if (vh.version <= self->lastUpdate) {
-								continue; // already applied this mutation
+					// run one iteration at the beginning
+					wait(delay(0));
+					if (dbInfo->history.size() > 0) {
+						if (self->lastUpdate < dbInfo->history[0].version) {
+							// This process missed too many global configuration
+							// history updates or the protocol version changed, so it
+							// must re-read the entire configuration range.
+							Version version =
+							    wait(self->refresh(self, self->lastUpdate, dbInfo->history.back().version));
+							self->lastUpdate = version;
+							// DBInfo could have changed after the wait. If
+							// changes are present, re-run the loop to make
+							// sure they are applied.
+							if (dbInfo->history.size() > 0 &&
+							    dbInfo->history[0].version != std::numeric_limits<Version>::max()) {
+								continue;
 							}
-
-							for (const auto& mutation : vh.mutations.contents()) {
-								if (mutation.type == MutationRef::SetValue) {
-									self->insert(mutation.param1, mutation.param2);
-								} else if (mutation.type == MutationRef::ClearRange) {
-									self->erase(KeyRangeRef(mutation.param1, mutation.param2));
-								} else {
-									ASSERT(false);
+						} else {
+							// Apply history in order, from lowest version to highest
+							// version. Mutation history should already be stored in
+							// ascending version order.
+							for (const auto& vh : dbInfo->history) {
+								if (vh.version <= self->lastUpdate) {
+									continue; // already applied this mutation
 								}
+
+								for (const auto& mutation : vh.mutations.contents()) {
+									if (mutation.type == MutationRef::SetValue) {
+										self->insert(mutation.param1, mutation.param2);
+									} else if (mutation.type == MutationRef::ClearRange) {
+										self->erase(KeyRangeRef(mutation.param1, mutation.param2));
+									} else {
+										ASSERT(false);
+									}
+								}
+
+								ASSERT(vh.version > self->lastUpdate);
+								self->lastUpdate = vh.version;
 							}
-
-							ASSERT(vh.version > self->lastUpdate);
-							self->lastUpdate = vh.version;
 						}
+						self->configChanged.trigger();
 					}
-
-					self->configChanged.trigger();
+					// In case this actor is canceled in the d'tor of GlobalConfig we can exit here.
+					wait(delay(0));
+					wait(self->dbInfoChanged.onTrigger());
 				} catch (Error& e) {
 					throw;
 				}

fdbclient/NativeAPI.actor.cpp

@@ -9075,8 +9075,9 @@ void Transaction::checkDeferredError() const {
 
 Reference<TransactionLogInfo> Transaction::createTrLogInfoProbabilistically(const Database& cx) {
 	if (!cx->isError()) {
-		double clientSamplingProbability =
-		    cx->globalConfig->get<double>(fdbClientInfoTxnSampleRate, CLIENT_KNOBS->CSI_SAMPLING_PROBABILITY);
+		double sampleRate =
+		    cx->globalConfig->get<double>(fdbClientInfoTxnSampleRate, std::numeric_limits<double>::infinity());
+		double clientSamplingProbability = std::isinf(sampleRate) ? CLIENT_KNOBS->CSI_SAMPLING_PROBABILITY : sampleRate;
 		if (((networkOptions.logClientInfo.present() && networkOptions.logClientInfo.get()) || BUGGIFY) &&
 		    deterministicRandom()->random01() < clientSamplingProbability &&
 		    (!g_network->isSimulated() || !g_simulator->speedUpSimulation)) {

fdbclient/include/fdbclient/CommitProxyInterface.h

@@ -727,14 +727,16 @@ struct ExclusionSafetyCheckRequest {
 struct GlobalConfigRefreshReply {
 	constexpr static FileIdentifier file_identifier = 12680327;
 	Arena arena;
+	Version version;
 	RangeResultRef result;
 
 	GlobalConfigRefreshReply() {}
-	GlobalConfigRefreshReply(Arena const& arena, RangeResultRef result) : arena(arena), result(result) {}
+	GlobalConfigRefreshReply(Arena const& arena, Version version, RangeResultRef result)
+	  : arena(arena), version(version), result(result) {}
 
 	template <class Ar>
 	void serialize(Ar& ar) {
-		serializer(ar, result, arena);
+		serializer(ar, result, version, arena);
 	}
 };
 

fdbclient/include/fdbclient/GlobalConfig.actor.h

@@ -163,7 +163,7 @@ private:
 	// of the global configuration keyspace.
 	void erase(KeyRangeRef range);
 
-	ACTOR static Future<Void> refresh(GlobalConfig* self, Version lastKnown);
+	ACTOR static Future<Version> refresh(GlobalConfig* self, Version lastKnown, Version largestSeen);
 	ACTOR static Future<Void> updater(GlobalConfig* self, const ClientDBInfo* dbInfo);
 
 	DatabaseContext* cx;

fdbserver/ClusterController.actor.cpp

@@ -1077,6 +1077,7 @@ void clusterRegisterMaster(ClusterControllerData* self, RegisterMasterRequest co
 		    .detail("GrvProxies", db->clientInfo->get().grvProxies)
 		    .detail("ReqGrvProxies", req.grvProxies)
 		    .detail("CommitProxies", db->clientInfo->get().commitProxies)
+		    .detail("GlobalConfigHistorySize", db->clientInfo->get().history.size())
 		    .detail("ReqCPs", req.commitProxies)
 		    .detail("TenantMode", db->clientInfo->get().tenantMode.toString())
 		    .detail("ReqTenantMode", db->config.tenantMode.toString())
@@ -1093,6 +1094,7 @@ void clusterRegisterMaster(ClusterControllerData* self, RegisterMasterRequest co
 		clientInfo.id = deterministicRandom()->randomUniqueID();
 		clientInfo.commitProxies = req.commitProxies;
 		clientInfo.grvProxies = req.grvProxies;
+		clientInfo.history = db->clientInfo->get().history;
 		clientInfo.tenantMode = TenantAPI::tenantModeForClusterType(db->clusterType, db->config.tenantMode);
 		clientInfo.clusterId = db->serverInfo->get().client.clusterId;
 		clientInfo.clusterType = db->clusterType;
@@ -1742,12 +1744,12 @@ ACTOR Future<Void> monitorStorageMetadata(ClusterControllerData* self) {
 ACTOR Future<Void> monitorGlobalConfig(ClusterControllerData::DBInfo* db) {
 	loop {
 		state ReadYourWritesTransaction tr(db->db);
+		state ClientDBInfo clientInfo;
 		loop {
 			try {
 				tr.setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
 				tr.setOption(FDBTransactionOptions::PRIORITY_SYSTEM_IMMEDIATE);
 				state Optional<Value> globalConfigVersion = wait(tr.get(globalConfigVersionKey));
-				state ClientDBInfo clientInfo = db->serverInfo->get().client;
 
 				if (globalConfigVersion.present()) {
 					// Since the history keys end with versionstamps, they
@@ -1758,11 +1760,12 @@ ACTOR Future<Void> monitorGlobalConfig(ClusterControllerData::DBInfo* db) {
 					// If the global configuration version key has been set,
 					// the history should contain at least one item.
 					ASSERT(globalConfigHistory.size() > 0);
+					clientInfo = db->serverInfo->get().client;
 					clientInfo.history.clear();
 
 					for (const auto& kv : globalConfigHistory) {
 						ObjectReader reader(kv.value.begin(), IncludeVersion());
-						if (reader.protocolVersion() != g_network->protocolVersion()) {
+						if (reader.protocolVersion() != g_network->protocolVersion() || BUGGIFY_WITH_PROB(0.01)) {
 							// If the protocol version has changed, the
 							// GlobalConfig actor should refresh its view by
 							// reading the entire global configuration key

fdbserver/GrvProxyServer.actor.cpp

@@ -366,7 +366,7 @@ ACTOR Future<Void> globalConfigRequestServer(GrvProxyData* grvProxyData, GrvProx
 				// point of view. The client learns the version through a
 				// ClientDBInfo update).
 				if (refresh.lastKnown <= cachedVersion) {
-					refresh.reply.send(GlobalConfigRefreshReply{ cachedData.arena(), cachedData });
+					refresh.reply.send(GlobalConfigRefreshReply{ cachedData.arena(), cachedVersion, cachedData });
 				} else {
 					refresh.reply.sendError(future_version());
 				}