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Support for replaying prepared XA transactions

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This patch implments replaying for prepared XA transactions.
Replay may happen in the following cases:

1) The transaction is BF aborted in prepared state and is idle. In
that case, the transaction is handed over to rollbacker for replay.

2) The transaction is BF aborted while executing the
commit (i.e. before or after successful certification). In
which case the transaction replays itself from fragment storage.

3) The transaction is BF aborted while certifying its commit
fragment. This case is handled like replay for streaming transactions,
where the provider is directly involved and re-delivers the last
fragment.
This commit is contained in:
Daniele Sciascia
2020-06-05 11:40:18 +02:00
parent 965642eded
commit b12bbd059c
7 changed files with 333 additions and 57 deletions
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29
src/client_state.cpp
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@@ -133,16 +133,25 @@ int wsrep::client_state::before_command()
}
else if (transaction_.state() == wsrep::transaction::s_aborted)
{
// Transaction was rolled back either just before sending result
// to the client, or after client_state become idle.
// Clean up the transaction and return error.
override_error(wsrep::e_deadlock_error);
lock.unlock();
(void)transaction_.after_statement();
lock.lock();
assert(transaction_.active() == false);
debug_log_state("before_command: error");
return 1;
// Transaction was rolled back either just before sending
// result to the client, or after client_state become idle.
if (transaction_.is_xa())
{
// Client will rollback explicitly, return error.
debug_log_state("before_command: error");
return 1;
}
else
{
// Clean up the transaction and return error.
override_error(wsrep::e_deadlock_error);
lock.unlock();
(void)transaction_.after_statement();
lock.lock();
assert(transaction_.active() == false);
debug_log_state("before_command: error");
return 1;
}
}
}
debug_log_state("before_command: success");