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MCOL-4675 DMLProc now automatically and gracefully shutdowns when a cluster state is set to

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SS_SHUTDOWN_PENDING | SS_ROLLBACK
This commit is contained in:
Roman Nozdrin
2021-05-18 18:46:35 +00:00
committed by Leonid Fedorov
parent 646ffb6f95
commit 90397dfed0
4 changed files with 44 additions and 4 deletions
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27
dmlproc/dmlprocessor.cpp
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@ -98,7 +98,7 @@ boost::mutex PackageHandler::tableOidMutex;
// If FORCE is set, we can't rollback.
struct CancellationThread
{
CancellationThread(DBRM* aDbrm) : fDbrm(aDbrm)
CancellationThread(DBRM* aDbrm, DMLServer& aServer) : fDbrm(aDbrm), fServer(aServer)
{}
void operator()()
{
@ -118,6 +118,9 @@ struct CancellationThread
// Check to see if someone has ordered a shutdown or suspend with rollback.
(void)fDbrm->getSystemShutdownPending(bRollback, bForce);
if (bForce)
break;
if (bDoingRollback && bRollback)
{
continue;
@ -162,6 +165,7 @@ struct CancellationThread
DMLProcessor::log(oss1.str(), logging::LOG_TYPE_INFO);
}
// WIP Need to set cluster to read-only via CMAPI before shutting the cluster down.
if (fDbrm->isReadWrite())
{
continue;
@ -288,10 +292,15 @@ struct CancellationThread
oss2 << "DMLProc has rolled back " << idleTransCount << " idle transactions.";
DMLProcessor::log(oss2.str(), logging::LOG_TYPE_INFO);
}
// Here is the end of the rollback if so DMLProc rollbacks what it can.
break;
}
}
// Setting the flag to tell DMLServer to exit.
fServer.startShutdown();
}
DBRM* fDbrm;
DMLServer& fServer;
};
PackageHandler::PackageHandler(const messageqcpp::IOSocket& ios,
@ -1195,7 +1204,7 @@ void added_a_pm(int)
}
DMLServer::DMLServer(int packageMaxThreads, int packageWorkQueueSize, DBRM* dbrm) :
fPackageMaxThreads(packageMaxThreads), fPackageWorkQueueSize(packageWorkQueueSize), fDbrm(dbrm)
fPackageMaxThreads(packageMaxThreads), fPackageWorkQueueSize(packageWorkQueueSize), fDbrm(dbrm), fShutdownFlag(false)
{
fMqServer.reset(new MessageQueueServer("DMLProc"));
@ -1214,14 +1223,24 @@ void DMLServer::start()
// CancellationThread is for telling all active transactions
// to quit working because the system is either going down
// or going into write suspend mode
CancellationThread cancelObject(fDbrm);
CancellationThread cancelObject(fDbrm, *this);
boost::thread cancelThread(cancelObject);
cout << "DMLProc is ready..." << endl;
const static struct timespec timeout = {1, 100}; // roughly 1 second TO
for (;;)
{
ios = fMqServer->accept();
ios = fMqServer->accept(&timeout);
// MCS polls in a loop watching for a pending shutdown
// that is signalled via fShutdownFlag set in a
// CancellationThread. CT sets the flag if a cluster state
// has SS_SHUTDOWNPENDING value set.
while (!ios.hasSocketDescriptor() && !pendingShutdown())
ios = fMqServer->accept(&timeout);
if (pendingShutdown())
break;
ios.setSockID(nextID++);
fDmlPackagepool.invoke(DMLProcessor(ios, fDbrm));
}