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Execution context switching for high priority service.

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This commit is contained in:
Teemu Ollakka
2018-07-09 11:35:20 +03:00
parent 95dbab4c08
commit 8a1e76bcec
10 changed files with 77 additions and 12 deletions
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2
dbsim/db_high_priority_service.hpp
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@ -28,6 +28,8 @@ namespace db
void after_apply() override;
void store_globals() override { }
void reset_globals() override { }
void switch_execution_context(wsrep::high_priority_service&) override
{ }
int log_dummy_write_set(const wsrep::ws_handle&,
const wsrep::ws_meta&)
{ return 0; }

9
dbsim/db_server_service.cpp
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@ -25,7 +25,14 @@ void db::server_service::release_storage_service(
delete storage_service;
}
wsrep::high_priority_service* db::server_service::streaming_applier_service()
wsrep::high_priority_service* db::server_service::streaming_applier_service(
wsrep::client_service&)
{
return server_.streaming_applier_service();
}
wsrep::high_priority_service* db::server_service::streaming_applier_service(
wsrep::high_priority_service&)
{
return server_.streaming_applier_service();
}

3
dbsim/db_server_service.hpp
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@ -17,7 +17,8 @@ namespace db
server_service(db::server& server);
wsrep::storage_service* storage_service(wsrep::client_service&) override;
void release_storage_service(wsrep::storage_service*) override;
wsrep::high_priority_service* streaming_applier_service() override;
wsrep::high_priority_service* streaming_applier_service(wsrep::client_service&) override;
wsrep::high_priority_service* streaming_applier_service(wsrep::high_priority_service&) override;
void release_high_priority_service(wsrep::high_priority_service*) override;
bool sst_before_init() const override;

16
include/wsrep/high_priority_service.hpp
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@ -80,9 +80,24 @@ namespace wsrep
*/
virtual void after_apply() = 0;
/**
* Store global execution context for high priority service.
*/
virtual void store_globals() = 0;
/**
* Reset global execution context for high priority service.
*/
virtual void reset_globals() = 0;
/**
* Switch exection context to context of orig_hps.
*
* @param orig_hps Original high priority service.
*/
virtual void switch_execution_context(
wsrep::high_priority_service& orig_hps) = 0;
virtual int log_dummy_write_set(const ws_handle&, const ws_meta&) = 0;
virtual bool is_replaying() const = 0;
@ -102,6 +117,7 @@ namespace wsrep
, current_service_(current_service)
{
orig_service_.reset_globals();
current_service_.switch_execution_context(orig_service_);
current_service_.store_globals();
}
~high_priority_switch()

19
include/wsrep/server_service.hpp
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@ -34,13 +34,30 @@ namespace wsrep
wsrep::client_service&) = 0;
virtual void release_storage_service(wsrep::storage_service*) = 0;
/**
* Create an applier state for streaming transaction applying.
*
* @param orig_cs Reference to client service which is
* requesting a new streaming applier service
* instance.
*
* @return Pointer to streaming applier client state.
*/
virtual wsrep::high_priority_service*
streaming_applier_service() = 0;
streaming_applier_service(wsrep::client_service& orig_cs) = 0;
/**
* Create an applier state for streaming transaction applying.
*
* @param orig_hps Reference to high priority service which is
* requesting a new streaming applier service
* instance.
*
* @return Pointer to streaming applier client state.
*/
virtual wsrep::high_priority_service*
streaming_applier_service(wsrep::high_priority_service& orig_hps) = 0;
/**
* Release a client state allocated by either local_client_state()

1
include/wsrep/transaction_id.hpp
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@ -25,6 +25,7 @@ namespace wsrep
{ }
type get() const { return id_; }
static unsigned long long undefined() { return type(-1); }
bool is_undefined() const { return (id_ == type(-1)); }
bool operator<(const transaction_id& other) const
{
return (id_ < other.id_);

18
src/server_state.cpp
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@ -61,7 +61,8 @@ namespace
assert(server_state.find_streaming_applier(
ws_meta.server_id(), ws_meta.transaction_id()) == 0);
wsrep::high_priority_service* sa(
server_state.server_service().streaming_applier_service());
server_state.server_service().streaming_applier_service(
high_priority_service));
server_state.start_streaming_applier(
ws_meta.server_id(), ws_meta.transaction_id(), sa);
sa->start_transaction(ws_handle, ws_meta);
@ -84,14 +85,13 @@ namespace
// commit fragment comes in. Although this is a valid
// situation, log a warning if a sac cannot be found as
// it may be an indication of a bug too.
assert(0);
wsrep::log_warning() << "Could not find applier context for "
<< ws_meta.server_id()
<< ": " << ws_meta.transaction_id();
}
else
{
wsrep::high_priority_switch(high_priority_service, *sa);
wsrep::high_priority_switch sw(high_priority_service, *sa);
ret = sa->apply_write_set(data);
sa->after_apply();
}
@ -117,7 +117,6 @@ namespace
// commit fragment comes in. Although this is a valid
// situation, log a warning if a sac cannot be found as
// it may be an indication of a bug too.
assert(0);
wsrep::log_warning()
<< "Could not find applier context for "
<< ws_meta.server_id()
@ -125,9 +124,14 @@ namespace
}
else
{
wsrep::high_priority_switch(high_priority_service, *sa);
ret = sa->commit();
sa->after_apply();
// Make high priority switch to go out of scope
// before the streaming applier is released.
{
wsrep::high_priority_switch sw(
high_priority_service, *sa);
ret = sa->commit();
sa->after_apply();
}
server_state.stop_streaming_applier(
ws_meta.server_id(), ws_meta.transaction_id());
server_state.server_service().release_high_priority_service(sa);

3
src/transaction.cpp
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@ -1080,7 +1080,8 @@ void wsrep::transaction::streaming_rollback()
{
assert(streaming_context_.rolled_back() == false);
wsrep::high_priority_service* sa(
server_service_.streaming_applier_service());
server_service_.streaming_applier_service(
client_state_.client_service()));
client_state_.server_state().start_streaming_applier(
client_state_.server_state().id(), id(), sa);
sa->adopt_transaction(*this);

2
test/mock_high_priority_service.hpp
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@ -43,6 +43,8 @@ namespace wsrep
void after_apply() WSREP_OVERRIDE;
void store_globals() WSREP_OVERRIDE { }
void reset_globals() WSREP_OVERRIDE { }
void switch_execution_context(wsrep::high_priority_service&)
WSREP_OVERRIDE { }
int log_dummy_write_set(const wsrep::ws_handle&,
const wsrep::ws_meta&)
WSREP_OVERRIDE { return 0; }

16
test/mock_server_state.hpp
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@ -63,7 +63,21 @@ namespace wsrep
delete client_state;
}
wsrep::high_priority_service* streaming_applier_service()
wsrep::high_priority_service* streaming_applier_service(
wsrep::client_service&)
{
wsrep::mock_client* cs(new wsrep::mock_client(
*this, ++last_client_id_,
wsrep::client_state::m_high_priority));
wsrep::mock_high_priority_service* ret(
new wsrep::mock_high_priority_service(*this, cs, false));
cs->open(cs->id());
cs->before_command();
return ret;
}
wsrep::high_priority_service* streaming_applier_service(
wsrep::high_priority_service&)
{
wsrep::mock_client* cs(new wsrep::mock_client(
*this, ++last_client_id_,