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Fix unknown PS ID on query re-routing

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If a PS command is routed multiple times, the ID will not be reverted to
the external ID in the failure cases. This prevented prepared statements
from being re-routed correctly.
This commit is contained in:
Markus Mäkelä 2018-11-09 08:57:06 +02:00
parent 226fe4871d
commit a9e2364979
No known key found for this signature in database
GPG Key ID: 72D48FCE664F7B19
1 changed files with 25 additions and 11 deletions
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36
server/modules/routing/readwritesplit/rwsplit_route_stmt.cc
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@ -106,6 +106,12 @@ void replace_binary_ps_id(GWBUF* buffer, uint32_t id)
uint8_t* ptr = GWBUF_DATA(buffer) + MYSQL_PS_ID_OFFSET;
gw_mysql_set_byte4(ptr, id);
}
uint32_t extract_binary_ps_id(GWBUF* buffer)
{
uint8_t* ptr = GWBUF_DATA(buffer) + MYSQL_PS_ID_OFFSET;
return gw_mysql_get_byte4(ptr);
}
}
bool RWSplitSession::have_connected_slaves() const
@ -178,14 +184,6 @@ bool RWSplitSession::route_single_stmt(GWBUF* querybuf)
uint8_t command = info.command();
uint32_t qtype = info.type_mask();
route_target_t route_target = info.target();
bool not_locked_to_master = !is_locked_to_master();
if (not_locked_to_master && mxs_mysql_is_ps_command(command) && !m_qc.large_query())
{
/** Replace the client statement ID with our internal one only if the
* target node is not the current master */
replace_binary_ps_id(querybuf, stmt_id);
}
SRWBackend target;
@ -312,7 +310,7 @@ bool RWSplitSession::route_single_stmt(GWBUF* querybuf)
// Target server was found and is in the correct state
succp = handle_got_target(querybuf, target, store_stmt);
if (succp && command == MXS_COM_STMT_EXECUTE && not_locked_to_master)
if (succp && command == MXS_COM_STMT_EXECUTE && !is_locked_to_master())
{
/** Track the targets of the COM_STMT_EXECUTE statements. This
* information is used to route all COM_STMT_FETCH commands
@ -1106,6 +1104,16 @@ bool RWSplitSession::handle_got_target(GWBUF* querybuf, SRWBackend& target, bool
*/
mxb_assert(target->get_reply_state() == REPLY_STATE_DONE || m_qc.large_query());
uint32_t orig_id = 0;
if (!is_locked_to_master() && mxs_mysql_is_ps_command(cmd) && !m_qc.large_query())
{
// Store the original ID in case routing fails
orig_id = extract_binary_ps_id(querybuf);
// Replace the ID with our internal one, the backends will replace it with their own ID
replace_binary_ps_id(querybuf, m_qc.current_route_info().stmt_id());
}
/**
* If we are starting a new query, we use RWBackend::write, otherwise we use
* RWBackend::continue_write to continue an ongoing query. RWBackend::write
@ -1156,11 +1164,17 @@ bool RWSplitSession::handle_got_target(GWBUF* querybuf, SRWBackend& target, bool
{
m_target_node.reset();
}
return true;
}
else
{
if (orig_id)
{
// Put the original ID back in case we try to route the query again
replace_binary_ps_id(querybuf, orig_id);
}
MXS_ERROR("Routing query failed.");
return false;
}
return success;
}