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MXS-1507: Add initial implementation of transaction replay

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Added the initial implementation of transaction replay. Transactions are
only replayed if the master fails when no statement is being executed.

The validity of the replayed transaction is done by verifying that the
checksums of the returned results are equal.

Added a close function into the Trx class to make resetting its state
easier. Also changed the return type of the pop_stmt to GWBUF* as the
places where it is used expect a raw GWBUF pointer.
This commit is contained in:
Markus Mäkelä
2018-04-19 15:36:14 +03:00
parent daecb6980b
commit 01bf5cc8b0
4 changed files with 102 additions and 32 deletions
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4
server/modules/routing/readwritesplit/rwsplit_route_stmt.cc
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@ -254,7 +254,7 @@ bool RWSplitSession::route_single_stmt(GWBUF *querybuf)
}
}
}
else if (can_retry_query())
else if (can_retry_query() || m_is_replay_active)
{
retry_query(gwbuf_clone(querybuf));
succp = true;
@ -819,7 +819,7 @@ bool RWSplitSession::should_replace_master(SRWBackend& target)
// We have a target server and it's not the current master
target && target != m_current_master &&
// We are not inside a transaction (also checks for autocommit=1)
!session_trx_is_active(m_client->session) &&
(!session_trx_is_active(m_client->session) || m_is_replay_active) &&
// We are not locked to the old master
!is_locked_to_master();
}