MDEV-31949 IV. Recovery
MDEV-33168 XA crash-recovery base on engines prepare first rule This commit address XA transaction's prepare, commit and rollback commands' crash-recovery both in the normal and semisync slave mode. Key changes include: - xid_recovery_member is extended to keep track of XID transaction "state" change. The state associated with its XID that when being reused could exists in binlog in multiple instance - xarecover_handlerton is extended to register the user prepare xid similarly to the normal transactions - xarecover_do_commit_or_rollback calls now a new xarecover_decide_xa() to decide on a user xid at the end of recovery - TC_LOG_BINLOG::recover and few members of Recovery_context class are extended to scan binlog for the user XIDs and keep track of them, and their marking as truncatable or contrary - that is durable Todo: 1. integrate with Xid_list_log_event 2. tests with multiple-engines
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