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Support for detaching prepared XA transactions

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Add support for detaching XA transactions. This is useful for handling
the case where the DBMS client has a transaction in prepared state and
disconnects. Before disconnect, the DBMS calls the newly introduced
client_state::xa_detach(), to cleanup the local transaction and
convert it to a high priority transaction. The DBMS may later attempt
to terminate the transaction through client_state::commit_by_xid() or
client_state::rollback_by_xid().

Also in this patch:

- Fix client_state::close() so that it does not rollback transactions
  in prepared state
- Changed class wsrep::xid representation to hold enough information
  so that DBMS can convert to its native representation
- Fix potential infinite loop in
  server_state::find_streaming_applier(wsrep:xid&)
- Append SR keys on prepare fragment and make it pa_unsafe
- Handle one phase commit (simply fall back to two phase)
- Do not rollback prepared streaming clients in
  server_state::close_orphaned_transactions()
This commit is contained in:
Daniele Sciascia
2020-03-25 15:40:24 +01:00
parent 2da6e4894e
commit 965642eded
9 changed files with 167 additions and 29 deletions
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13
test/transaction_test_xa.cpp
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@@ -7,8 +7,10 @@
BOOST_FIXTURE_TEST_CASE(transaction_xa,
replicating_client_fixture_sync_rm)
{
wsrep::xid xid(1, 9, 0, "test xid");
BOOST_REQUIRE(cc.start_transaction(wsrep::transaction_id(1)) == 0);
cc.assign_xid("test xid");
cc.assign_xid(xid);
BOOST_REQUIRE(tc.active());
BOOST_REQUIRE(tc.id() == wsrep::transaction_id(1));
@@ -52,8 +54,10 @@ BOOST_FIXTURE_TEST_CASE(transaction_xa,
BOOST_FIXTURE_TEST_CASE(transaction_xa_applying,
applying_client_fixture)
{
wsrep::xid xid(1, 9, 0, "test xid");
start_transaction(wsrep::transaction_id(1), wsrep::seqno(1));
cc.assign_xid("test xid");
cc.assign_xid(xid);
BOOST_REQUIRE(cc.before_prepare() == 0);
BOOST_REQUIRE(tc.state() == wsrep::transaction::s_preparing);
@@ -85,8 +89,11 @@ BOOST_FIXTURE_TEST_CASE(transaction_xa_applying,
BOOST_FIXTURE_TEST_CASE(transaction_xa_sr,
streaming_client_fixture_byte)
{
wsrep::xid xid(1, 9, 0, "test xid");
BOOST_REQUIRE(cc.start_transaction(wsrep::transaction_id(1)) == 0);
cc.assign_xid("test xid");
cc.assign_xid(xid);
cc.bytes_generated_ = 1;
BOOST_REQUIRE(cc.after_row() == 0);
BOOST_REQUIRE(tc.streaming_context().fragments_certified() == 1);