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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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30
include/wsrep/high_priority_service.hpp
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@ -41,7 +41,7 @@ namespace wsrep
virtual ~high_priority_service() { }
int apply(const ws_handle& ws_handle, const ws_meta& ws_meta,
const const_buffer& data)
const const_buffer& data)
{
return server_state_.on_apply(*this, ws_handle, ws_meta, data);
}
@ -70,9 +70,13 @@ namespace wsrep
* new transaction before applying a write set and must
* either commit to make changes persistent or roll back.
*
* @params ws_meta Write set meta data
* @params ws Write set buffer
* @params err Buffer to store error data
*/
virtual int apply_write_set(const wsrep::ws_meta&,
const wsrep::const_buffer&) = 0;
virtual int apply_write_set(const wsrep::ws_meta& ws_meta,
const wsrep::const_buffer& ws,
wsrep::mutable_buffer& err) = 0;
/**
* Append a fragment into fragment storage. This will be
@ -141,9 +145,14 @@ namespace wsrep
*
* TOI operation is a standalone operation and should not
* be executed as a part of a transaction.
*
* @params ws_meta Write set meta data
* @params ws Write set buffer
* @params err Buffer to store error data
*/
virtual int apply_toi(const wsrep::ws_meta&,
const wsrep::const_buffer&) = 0;
virtual int apply_toi(const wsrep::ws_meta& ws_meta,
const wsrep::const_buffer& ws,
wsrep::mutable_buffer& err) = 0;
/**
* Actions to take after applying a write set was completed.
@ -175,11 +184,19 @@ namespace wsrep
*
* @params ws_handle Write set handle
* @params ws_meta Write set meta data
* @params err Optional applying error data buffer, may be modified
*
* @return Zero in case of success, non-zero on failure
*/
virtual int log_dummy_write_set(const ws_handle& ws_handle,
const ws_meta& ws_meta) = 0;
const ws_meta& ws_meta,
wsrep::mutable_buffer& err) = 0;
/**
* Adopt (store) apply error description for further reporting
* to provider, source buffer may be modified.
*/
virtual void adopt_apply_error(wsrep::mutable_buffer& err) = 0;
virtual bool is_replaying() const = 0;
@ -189,6 +206,7 @@ namespace wsrep
* Debug facility to crash the server at given point.
*/
virtual void debug_crash(const char* crash_point) = 0;
protected:
wsrep::server_state& server_state_;
bool must_exit_;