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96b2c19e42
log_dummy_write_set() is what releases commit order through commit_order_leave() - which hands the apply error to the provider to drive the inconsistency vote - and advances the storage engine checkpoint. Skipping it on a rollback error leaves the seqno stuck in commit order so all following appliers block on commit_order_enter, and the node silently locks the cluster while staying in the primary component. Always call log_dummy_write_set() on the apply-error path, regardless of the rollback result. The rollback result is still folded into ret so it is not lost.
Introduction
Project name: wsrep-lib - Integration library for WSREP API
The purpose of this project is to implement C++ wrapper for wsrep API with additional convenience for transaction processing.
This project will abstract away most of the transaction state management required on DBMS side and will provide simple C++ interface for key set population, data set population, commit processing, write set applying etc.
Build Instructions
In order to build the library, run
cmake . make
Build Requirements
- C++ compiler (g++ 5.4 or later recommended)
- CMake version 2.8 or later
- The following Boost libraries are required if the unit tests and
the sample program is compiled
- Unit Test Framework
- Program Options
- Filesystem
- Thread
CMake Options
- WSREP_LIB_WITH_UNIT_TESTS - Compile unit tests (default ON)
- WSREP_LIB_WITH_AUTO_TEST - Run unit tests automatically as a part of compilation (default OFF)
- WSREP_LIB_WITH_DBSIM - Compile sample program (default ON)
- WSREP_LIB_WITH_ASAN - Enable address sanitizer instrumentation (default OFF)
- WSREP_LIB_WITH_TSAN - Enable thread sanitizer instrumentation (default OFF)
- WSREP_LIB_WITH_DOCUMENTATION - Generate documentation, requires Doxygen (default OFF)
- WSREP_LIB_WITH_COVERAGE - Compile with coverage instrumentation (default OFF)
- WSREP_LIB_STRICT_BUILD_FLAGS - Compile with strict build flags, currently enables -Weffc++ (default OFF)
- WSREP_LIB_MAINTAINER_MODE - Make every compiler warning to be treated as error, enables -Werror compiler flag (default OFF)