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MCOL-5000 Disable ALTER TABLE statement execution on replicas.

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Exit early from the plugin execution of ALTER TABLE statements
on the replica nodes. This is to prevent re-execution of syscat
table population from the replica nodes which should only be
executed once by the primary node in a CS cluster setup.
This commit is contained in:
Gagan Goel
2022-10-14 17:20:55 +00:00
parent 878a8ab857
commit 8a9b6b32e7
1 changed files with 9 additions and 3 deletions
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12
dbcon/mysql/ha_mcs_impl.cpp
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@ -2206,7 +2206,9 @@ int ha_mcs::impl_rnd_init(TABLE* table, const std::vector<COND*>& condStack)
gp_walk_info gwi(timeZoneOffset);
gwi.thd = thd;
if (thd->slave_thread && !get_replication_slave(thd) && isDMLStatement(thd->lex->sql_command))
if (thd->slave_thread && !get_replication_slave(thd) &&
(isDMLStatement(thd->lex->sql_command) ||
thd->lex->sql_command == SQLCOM_ALTER_TABLE))
return 0;
// check whether the system is ready to process statement.
@ -2580,7 +2582,9 @@ int ha_mcs_impl_rnd_next(uchar* buf, TABLE* table, long timeZone)
{
THD* thd = current_thd;
if (thd->slave_thread && !get_replication_slave(thd) && isDMLStatement(thd->lex->sql_command))
if (thd->slave_thread && !get_replication_slave(thd) &&
(isDMLStatement(thd->lex->sql_command) ||
thd->lex->sql_command == SQLCOM_ALTER_TABLE))
return HA_ERR_END_OF_FILE;
if (isMCSTableUpdate(thd) || isMCSTableDelete(thd))
@ -2659,7 +2663,9 @@ int ha_mcs_impl_rnd_end(TABLE* table, bool is_pushdown_hand)
int rc = 0;
THD* thd = current_thd;
if (thd->slave_thread && !get_replication_slave(thd) && isDMLStatement(thd->lex->sql_command))
if (thd->slave_thread && !get_replication_slave(thd) &&
(isDMLStatement(thd->lex->sql_command) ||
thd->lex->sql_command == SQLCOM_ALTER_TABLE))
return 0;
cal_connection_info* ci = nullptr;