lib/wsrep-lib
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SR applying implementation, unit tests.

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This commit is contained in:
Teemu Ollakka
2018-06-14 11:14:40 +03:00
parent 39c9ef8a63
commit a8ab9c6dbd
9 changed files with 188 additions and 49 deletions
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113
src/server_context.cpp
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@ -122,7 +122,6 @@ int wsrep::server_context::on_apply(
// wsrep::log_debug() << "server_context::on apply flags: "
// << flags_to_string(ws_meta.flags());
assert(ws_handle.opaque());
assert(ws_meta.flags());
bool not_replaying(txc.state() !=
wsrep::transaction_context::s_replaying);
@ -164,12 +163,91 @@ int wsrep::server_context::on_apply(
assert(ret ||
txc.state() == wsrep::transaction_context::s_committed);
}
else if (starts_transaction(ws_meta.flags()))
{
assert(not_replaying);
assert(find_streaming_applier(
ws_meta.server_id(), ws_meta.transaction_id()) == 0);
wsrep::client_context* sac(streaming_applier_client_context());
start_streaming_applier(
ws_meta.server_id(), ws_meta.transaction_id(), sac);
sac->start_transaction(ws_handle, ws_meta);
{
// TODO: Client context switch will be ultimately
// implemented by the application. Therefore need to
// introduce a virtual method call which takes
// both original and sac client contexts as argument
// and a functor which does the applying.
wsrep::client_context_switch sw(client_context, *sac);
sac->before_command();
sac->before_statement();
sac->apply(data);
sac->after_statement();
sac->after_command_before_result();
sac->after_command_after_result();
}
log_dummy_write_set(client_context, ws_meta);
}
else if (ws_meta.flags() == 0)
{
wsrep::client_context* sac(
find_streaming_applier(
ws_meta.server_id(), ws_meta.transaction_id()));
if (sac == 0)
{
// It is possible that rapid group membership changes
// may cause streaming transaction be rolled back before
// 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.
wsrep::log_warning() << "Could not find applier context for "
<< ws_meta.server_id()
<< ": " << ws_meta.transaction_id();
}
else
{
wsrep::client_context_switch(client_context, *sac);
sac->before_command();
sac->before_statement();
ret = sac->apply(data);
sac->after_statement();
sac->after_command_before_result();
sac->after_command_after_result();
}
log_dummy_write_set(client_context, ws_meta);
}
else if (commits_transaction(ws_meta.flags()))
{
if (not_replaying)
{
// SR commit not implemented yet
assert(0);
wsrep::client_context* sac(
find_streaming_applier(
ws_meta.server_id(), ws_meta.transaction_id()));
assert(sac);
if (sac == 0)
{
// It is possible that rapid group membership changes
// may cause streaming transaction be rolled back before
// 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.
wsrep::log_warning() << "Could not find applier context for "
<< ws_meta.server_id()
<< ": " << ws_meta.transaction_id();
}
else
{
wsrep::client_context_switch(client_context, *sac);
sac->before_command();
sac->before_statement();
ret = sac->commit();
sac->after_statement();
sac->after_command_before_result();
sac->after_command_after_result();
stop_streaming_applier(
ws_meta.server_id(), ws_meta.transaction_id());
delete sac;
}
}
else
{
@ -198,7 +276,7 @@ bool wsrep::server_context::statement_allowed_for_streaming(
return false;
}
void wsrep::server_context::insert_streaming_applier(
void wsrep::server_context::start_streaming_applier(
const wsrep::id& server_id,
const wsrep::transaction_id& transaction_id,
wsrep::client_context* client_context)
@ -213,6 +291,33 @@ void wsrep::server_context::insert_streaming_applier(
}
}
void wsrep::server_context::stop_streaming_applier(
const wsrep::id& server_id,
const wsrep::transaction_id& transaction_id)
{
streaming_appliers_map::iterator i(
streaming_appliers_.find(std::make_pair(server_id, transaction_id)));
assert(i != streaming_appliers_.end());
if (i == streaming_appliers_.end())
{
wsrep::log_warning() << "Could not find streaming applier for "
<< server_id << ":" << transaction_id;
}
else
{
streaming_appliers_.erase(i);
}
}
wsrep::client_context* wsrep::server_context::find_streaming_applier(
const wsrep::id& server_id,
const wsrep::transaction_id& transaction_id) const
{
streaming_appliers_map::const_iterator i(
streaming_appliers_.find(std::make_pair(server_id, transaction_id)));
return (i == streaming_appliers_.end() ? 0 : i->second);
}
// Private
void wsrep::server_context::state(