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MDEV-15740 Backport wsrep recovery fixes from 10.4.

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Clear wsrep XID in innobase_rollback_by_xid() for recovered wsrep
transaction in order to avoid resetting XID storage when rolling back
wsrep transaction during recovery.

Sort wsrep XIDs read from storage engine in ascending order and
erify that the range is continuous during crash recovery. If binlog is off,
commit all recovered transactions for continuous seqno range. This is safe
because all transactions with wsrep XID have been certified and must be
committed in the cluster. On the other hand if binlog is on, respect binlog
as a transaction coordinator in order to avoid missing transactions in binlog
that have been committed into storage engine .
This commit is contained in:
Teemu Ollakka
2019-01-24 16:31:33 +02:00
parent ce28fa5303
commit 040b840de7
4 changed files with 92 additions and 3 deletions
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51
sql/handler.cc
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@@ -1827,6 +1827,35 @@ static char* xid_to_str(char *buf, XID *xid)
}
#endif
#ifdef WITH_WSREP
static my_xid wsrep_order_and_check_continuity(XID *list, int len)
{
wsrep_sort_xid_array(list, len);
wsrep_uuid_t uuid;
wsrep_seqno_t seqno;
if (wsrep_get_SE_checkpoint(uuid, seqno))
{
WSREP_ERROR("Could not read wsrep SE checkpoint for recovery");
return 0;
}
long long cur_seqno= seqno;
for (int i= 0; i < len; ++i)
{
if (!wsrep_is_wsrep_xid(list + i) ||
wsrep_xid_seqno(*(list + i)) != cur_seqno + 1)
{
WSREP_WARN("Discovered discontinuity in recovered wsrep "
"transaction XIDs. Truncating the recovery list to "
"%d entries", i);
break;
}
++cur_seqno;
}
WSREP_INFO("Last wsrep seqno to be recovered %lld", cur_seqno);
return (cur_seqno < 0 ? 0 : cur_seqno);
}
#endif /* WITH_WSREP */
/**
recover() step of xa.
@@ -1864,6 +1893,19 @@ static my_bool xarecover_handlerton(THD *unused, plugin_ref plugin,
{
sql_print_information("Found %d prepared transaction(s) in %s",
got, hton_name(hton)->str);
#ifdef WITH_WSREP
/* If wsrep_on=ON, XIDs are first ordered and then the range of
recovered XIDs is checked for continuity. All the XIDs which
are in continuous range can be safely committed if binlog
is off since they have already ordered and certified in the
cluster. */
my_xid wsrep_limit= 0;
if (WSREP_ON)
{
wsrep_limit= wsrep_order_and_check_continuity(info->list, got);
}
#endif /* WITH_WSREP */
for (int i=0; i < got; i ++)
{
my_xid x= WSREP_ON && wsrep_is_wsrep_xid(&info->list[i]) ?
@@ -1885,9 +1927,12 @@ static my_bool xarecover_handlerton(THD *unused, plugin_ref plugin,
continue;
}
// recovery mode
if (info->commit_list ?
my_hash_search(info->commit_list, (uchar *)&x, sizeof(x)) != 0 :
tc_heuristic_recover == TC_HEURISTIC_RECOVER_COMMIT)
if (IF_WSREP((wsrep_emulate_bin_log &&
wsrep_is_wsrep_xid(info->list + i) &&
x <= wsrep_limit), false) ||
(info->commit_list ?
my_hash_search(info->commit_list, (uchar *)&x, sizeof(x)) != 0 :
tc_heuristic_recover == TC_HEURISTIC_RECOVER_COMMIT))
{
#ifndef DBUG_OFF
int rc=