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codership/wsrep-lib#104 Error voting support

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- populate and pass real error description buffer to provider in case
   of applying error
 - return 0 from server_state::on_apply() if error voting confirmed
   consistency
 - remove fragments and rollback after fragment applying failure
 - always release streaming applier on commit or rollback
This commit is contained in:
Alexey Yurchenko
2019-04-30 19:00:48 +03:00
parent fd66bdef0b
commit 0f676bd893
22 changed files with 470 additions and 187 deletions
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41
include/wsrep/client_state.hpp
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@ -90,6 +90,8 @@ namespace wsrep
*/
enum mode
{
/** undefined mode */
m_undefined,
/** Locally operating client session. */
m_local,
/** High priority mode */
@ -247,6 +249,8 @@ namespace wsrep
/**
* Perform cleanup after applying a transaction.
*
* @param err Applying error (empty for no error)
*/
void after_applying()
{
@ -508,6 +512,15 @@ namespace wsrep
transaction_.adopt(transaction);
}
/**
* Adopt (store) transaction applying error for further processing.
*/
void adopt_apply_error(wsrep::mutable_buffer& err)
{
assert(mode_ == m_high_priority);
transaction_.adopt_apply_error(err);
}
/**
* Clone enough state from another transaction so that replaing will
* be possible with a transaction contained in this client state.
@ -546,15 +559,15 @@ namespace wsrep
*
* @return Zero on success, non-zero otherwise.
*/
int enter_toi(const wsrep::key_array& key_array,
const wsrep::const_buffer& buffer,
int flags);
int enter_toi_local(const wsrep::key_array& key_array,
const wsrep::const_buffer& buffer,
int flags);
/**
* Enter applying total order critical section.
* Enter applier TOI mode
*
* @param ws_meta Write set meta data
*/
int enter_toi(const wsrep::ws_meta& ws_meta);
void enter_toi_mode(const wsrep::ws_meta& ws_meta);
/**
* Return true if the client_state is under TOI operation.
@ -573,10 +586,20 @@ namespace wsrep
{
return toi_mode_;
}
/**
* Leave total order isolation critical section.
* (for local mode clients)
*
* @param err definition of the error that happened during the
* execution of TOI operation (empty for no error)
*/
int leave_toi();
int leave_toi_local(const wsrep::mutable_buffer& err);
/**
* Leave applier TOI mode.
*/
void leave_toi_mode();
/**
* Begin rolling schema upgrade operation.
@ -770,7 +793,7 @@ namespace wsrep
, client_service_(client_service)
, id_(id)
, mode_(mode)
, toi_mode_()
, toi_mode_(m_undefined)
, state_(s_none)
, state_hist_()
, transaction_(*this)
@ -804,6 +827,9 @@ namespace wsrep
enum wsrep::provider::status status =
wsrep::provider::success);
void enter_toi_common();
void leave_toi_common();
wsrep::thread::id owning_thread_id_;
wsrep::thread::id current_thread_id_;
bool has_rollbacker_;
@ -864,6 +890,7 @@ namespace wsrep
{
switch (mode)
{
case wsrep::client_state::m_undefined: return "undefined";
case wsrep::client_state::m_local: return "local";
case wsrep::client_state::m_high_priority: return "high priority";
case wsrep::client_state::m_toi: return "toi";