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Remove mutex that was only needed for a minor optimization.

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This commit is contained in:
A.J. Beamon 2021-07-23 10:20:50 -07:00
parent 052e32ae18
commit 0e9dabcabb
2 changed files with 18 additions and 20 deletions
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14
fdbclient/MultiVersionTransaction.actor.cpp
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@ -896,13 +896,14 @@ MultiVersionDatabase::MultiVersionDatabase(MultiVersionApi* api,
api->runOnExternalClients(threadIdx, [this](Reference<ClientInfo> client) { dbState->addClient(client); });
api->runOnExternalClientsAllThreads([&clusterFilePath](Reference<ClientInfo> client) {
// This creates a database to initialize some client state on the external library
// We only do this on 6.2+ clients to avoid some bugs associated with older versions
// This deletes the new database immediately to discard its connections
// This creates a database to initialize some client state on the external library.
// We only do this on 6.2+ clients to avoid some bugs associated with older versions.
// This deletes the new database immediately to discard its connections.
//
// Simultaneous attempts to create a database could result in us running this initialization
// code in multiple threads simultaneously. It is necessary that each attempt have a chance
// to run this initialization in case the other fails, and it's safe to run them in parallel.
if (client->protocolVersion.hasCloseUnusedConnection() && !client->initialized) {
MutexHolder holder(client->initializationMutex);
if (!client->initialized) {
try {
Reference<IDatabase> newDb = client->api->createDatabase(clusterFilePath.c_str());
client->initialized = true;
@ -916,7 +917,6 @@ MultiVersionDatabase::MultiVersionDatabase(MultiVersionApi* api,
.error(e);
}
}
}
});
// For clients older than 6.2 we create and maintain our database connection

2
fdbclient/MultiVersionTransaction.h
View File

@ -420,8 +420,6 @@ struct ClientInfo : ClientDesc, ThreadSafeReferenceCounted<ClientInfo> {
std::atomic_bool initialized;
std::vector<std::pair<void (*)(void*), void*>> threadCompletionHooks;
Mutex initializationMutex;
ClientInfo()
: ClientDesc(std::string(), false), protocolVersion(0), api(nullptr), failed(true), initialized(false) {}
ClientInfo(IClientApi* api)