mirror of
https://github.com/codership/wsrep-lib.git
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TOI replicating and applying codepaths
This commit is contained in:
Teemu Ollakka
@ -15,6 +15,196 @@
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namespace
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{
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int apply_write_set(wsrep::server_state& server_state,
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wsrep::client_state& client_state,
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const wsrep::ws_handle& ws_handle,
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const wsrep::ws_meta& ws_meta,
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const wsrep::const_buffer& data)
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{
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int ret(0);
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const wsrep::transaction& txc(client_state.transaction());
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assert(client_state.mode() == wsrep::client_state::m_high_priority);
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bool not_replaying(txc.state() !=
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wsrep::transaction::s_replaying);
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if (wsrep::starts_transaction(ws_meta.flags()) &&
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wsrep::commits_transaction(ws_meta.flags()))
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{
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if (not_replaying)
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{
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client_state.before_command();
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client_state.before_statement();
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assert(txc.active() == false);
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client_state.start_transaction(ws_handle, ws_meta);
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}
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else
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{
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client_state.start_replaying(ws_meta);
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}
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if (client_state.client_service().apply_write_set(data))
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{
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ret = 1;
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}
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else if (client_state.client_service().commit(ws_handle, ws_meta))
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{
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ret = 1;
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}
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if (ret)
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{
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client_state.client_service().rollback();
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}
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if (not_replaying)
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{
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client_state.after_statement();
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client_state.after_command_before_result();
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client_state.after_command_after_result();
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}
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assert(ret ||
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txc.state() == wsrep::transaction::s_committed);
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}
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else if (wsrep::starts_transaction(ws_meta.flags()))
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{
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assert(not_replaying);
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assert(server_state.find_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id()) == 0);
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wsrep::client_state* sac(
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server_state.server_service().streaming_applier_client_state());
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server_state.start_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id(), sac);
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sac->start_transaction(ws_handle, ws_meta);
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{
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// TODO: Client context switch will be ultimately
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// implemented by the application. Therefore need to
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// introduce a virtual method call which takes
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// both original and sac client contexts as argument
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// and a functor which does the applying.
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wsrep::client_state_switch sw(client_state, *sac);
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sac->before_command();
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sac->before_statement();
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sac->client_service().apply_write_set(data);
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sac->after_statement();
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sac->after_command_before_result();
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sac->after_command_after_result();
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}
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server_state.server_service().log_dummy_write_set(client_state, ws_meta);
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}
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else if (ws_meta.flags() == 0)
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{
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wsrep::client_state* sac(
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server_state.find_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id()));
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if (sac == 0)
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{
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// It is possible that rapid group membership changes
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// may cause streaming transaction be rolled back before
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// commit fragment comes in. Although this is a valid
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// situation, log a warning if a sac cannot be found as
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// it may be an indication of a bug too.
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wsrep::log_warning() << "Could not find applier context for "
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<< ws_meta.server_id()
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<< ": " << ws_meta.transaction_id();
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}
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else
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{
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wsrep::client_state_switch(client_state, *sac);
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sac->before_command();
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sac->before_statement();
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ret = sac->client_service().apply_write_set(data);
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sac->after_statement();
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sac->after_command_before_result();
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sac->after_command_after_result();
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}
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server_state.server_service().log_dummy_write_set(
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client_state, ws_meta);
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}
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else if (wsrep::commits_transaction(ws_meta.flags()))
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{
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if (not_replaying)
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{
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wsrep::client_state* sac(
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server_state.find_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id()));
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assert(sac);
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if (sac == 0)
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{
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// It is possible that rapid group membership changes
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// may cause streaming transaction be rolled back before
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// commit fragment comes in. Although this is a valid
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// situation, log a warning if a sac cannot be found as
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// it may be an indication of a bug too.
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wsrep::log_warning()
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<< "Could not find applier context for "
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<< ws_meta.server_id()
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<< ": " << ws_meta.transaction_id();
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}
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else
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{
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wsrep::client_state_switch(client_state, *sac);
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sac->before_command();
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sac->before_statement();
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ret = sac->client_service().commit(ws_handle, ws_meta);
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sac->after_statement();
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sac->after_command_before_result();
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sac->after_command_after_result();
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server_state.stop_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id());
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server_state.server_service().release_client_state(sac);
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}
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}
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else
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{
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ret = client_state.start_replaying(ws_meta) ||
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client_state.client_service().apply_write_set(
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wsrep::const_buffer()) ||
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client_state.client_service().commit(ws_handle, ws_meta);
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}
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}
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else
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{
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// SR fragment applying not implemented yet
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assert(0);
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}
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if (not_replaying)
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{
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assert(txc.active() == false);
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}
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return ret;
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}
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int apply_toi(wsrep::server_service&,
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wsrep::client_state& client_state,
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const wsrep::ws_meta& ws_meta,
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const wsrep::const_buffer& data)
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{
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if (wsrep::starts_transaction(ws_meta.flags()) &&
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wsrep::commits_transaction(ws_meta.flags()))
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{
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// Regular toi
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client_state.enter_toi(ws_meta);
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int ret(client_state.client_service().apply_toi(data));
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client_state.leave_toi();
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return ret;
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}
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else if (wsrep::starts_transaction(ws_meta.flags()))
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{
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// NBO begin
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throw wsrep::not_implemented_error();
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}
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else if (wsrep::commits_transaction(ws_meta.flags()))
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{
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// NBO end
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throw wsrep::not_implemented_error();
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}
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else
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{
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assert(0);
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return 0;
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}
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}
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}
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@ -315,154 +505,21 @@ int wsrep::server_state::on_apply(
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const wsrep::ws_meta& ws_meta,
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const wsrep::const_buffer& data)
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{
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int ret(0);
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const wsrep::transaction& txc(client_state.transaction());
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assert(client_state.mode() == wsrep::client_state::m_high_priority);
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bool not_replaying(txc.state() !=
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wsrep::transaction::s_replaying);
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if (starts_transaction(ws_meta.flags()) &&
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commits_transaction(ws_meta.flags()))
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if (is_toi(ws_meta.flags()))
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{
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if (not_replaying)
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{
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client_state.before_command();
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client_state.before_statement();
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assert(txc.active() == false);
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client_state.start_transaction(ws_handle, ws_meta);
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}
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else
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{
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client_state.start_replaying(ws_meta);
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}
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if (client_state.client_service().apply(data))
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{
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ret = 1;
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}
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else if (client_state.client_service().commit(ws_handle, ws_meta))
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{
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ret = 1;
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}
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if (ret)
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{
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client_state.client_service().rollback();
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}
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if (not_replaying)
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{
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client_state.after_statement();
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client_state.after_command_before_result();
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client_state.after_command_after_result();
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}
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assert(ret ||
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txc.state() == wsrep::transaction::s_committed);
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return apply_toi(server_service_, client_state, ws_meta, data);
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}
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else if (starts_transaction(ws_meta.flags()))
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else if (is_commutative(ws_meta.flags()) || is_native(ws_meta.flags()))
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{
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assert(not_replaying);
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assert(find_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id()) == 0);
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wsrep::client_state* sac(server_service_.streaming_applier_client_state());
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start_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id(), sac);
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sac->start_transaction(ws_handle, ws_meta);
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{
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// TODO: Client context switch will be ultimately
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// implemented by the application. Therefore need to
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// introduce a virtual method call which takes
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// both original and sac client contexts as argument
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// and a functor which does the applying.
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wsrep::client_state_switch sw(client_state, *sac);
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sac->before_command();
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sac->before_statement();
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sac->client_service().apply(data);
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sac->after_statement();
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sac->after_command_before_result();
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sac->after_command_after_result();
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}
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server_service_.log_dummy_write_set(client_state, ws_meta);
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}
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else if (ws_meta.flags() == 0)
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{
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wsrep::client_state* sac(
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find_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id()));
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if (sac == 0)
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{
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// It is possible that rapid group membership changes
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// may cause streaming transaction be rolled back before
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// commit fragment comes in. Although this is a valid
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// situation, log a warning if a sac cannot be found as
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// it may be an indication of a bug too.
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wsrep::log_warning() << "Could not find applier context for "
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<< ws_meta.server_id()
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<< ": " << ws_meta.transaction_id();
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}
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else
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{
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wsrep::client_state_switch(client_state, *sac);
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sac->before_command();
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sac->before_statement();
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ret = sac->client_service().apply(data);
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sac->after_statement();
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sac->after_command_before_result();
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sac->after_command_after_result();
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}
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server_service_.log_dummy_write_set(client_state, ws_meta);
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}
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else if (commits_transaction(ws_meta.flags()))
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{
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if (not_replaying)
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{
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wsrep::client_state* sac(
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find_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id()));
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assert(sac);
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if (sac == 0)
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{
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// It is possible that rapid group membership changes
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// may cause streaming transaction be rolled back before
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// commit fragment comes in. Although this is a valid
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// situation, log a warning if a sac cannot be found as
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// it may be an indication of a bug too.
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wsrep::log_warning() << "Could not find applier context for "
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<< ws_meta.server_id()
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<< ": " << ws_meta.transaction_id();
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}
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else
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{
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wsrep::client_state_switch(client_state, *sac);
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sac->before_command();
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sac->before_statement();
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ret = sac->client_service().commit(ws_handle, ws_meta);
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sac->after_statement();
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sac->after_command_before_result();
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sac->after_command_after_result();
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stop_streaming_applier(
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ws_meta.server_id(), ws_meta.transaction_id());
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server_service_.release_client_state(sac);
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}
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}
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else
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{
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ret = client_state.start_replaying(ws_meta) ||
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client_state.client_service().apply(wsrep::const_buffer()) ||
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client_state.client_service().commit(ws_handle, ws_meta);
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}
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// Not implemented yet.
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assert(0);
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return 0;
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}
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else
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{
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// SR fragment applying not implemented yet
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assert(0);
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return apply_write_set(*this, client_state,
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ws_handle, ws_meta, data);
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}
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if (not_replaying)
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{
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assert(txc.active() == false);
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}
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return ret;
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}
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void wsrep::server_state::start_streaming_applier(
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