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Support recovery of XA transactions

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* Add method `restore_prepared_transaction` to `client_state` class
  which restores a transaction state from storage given its xid.
* Add method `commit_or_rollback_by_xid` to terminate prepared XA
  transactions by xid.
* Make sure that transactions in prepared state are not rolled back
  when their master fails/partitions away.
This commit is contained in:
Daniele Sciascia
2019-03-14 11:30:01 +01:00
parent 98af85498b
commit 052247144f
16 changed files with 210 additions and 31 deletions
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30
include/wsrep/client_state.hpp
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@ -305,6 +305,36 @@ namespace wsrep
return transaction_.assign_read_view(gtid);
}
/**
* Restores the client's transaction to prepared state
*
* The purpose of this method is to restore transaction state
* during recovery of a prepared XA transaction.
*/
int restore_prepared_transaction()
{
return transaction_.restore_to_prepared_state();
}
/**
* Terminate transaction with the given xid
*
* Sends a commit or rollback fragment to terminate the a
* transaction with the given xid. For the fragment to be
* sent, a streaming applier for the transaction must exist
* and the transaction must be in prepared state.
*
* @param xid the xid of the the transaction to terminate
* @param commit whether to send a commmit or rollback fragment
*
* @return Zero on success, non-zero on error. In case of error
* the client_state's current_error is set
*/
int commit_or_rollback_by_xid(const std::string& xid, bool commit)
{
return transaction_.commit_or_rollback_by_xid(xid, commit);
}
/**
* Append a key into transaction write set.
*