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MXS-852: Fix prepared statement collection

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If a prepared statement response was collected into one buffer, it doesn't
need to be processed again. By jumping directly to the routing of the
collected result, we prevent the unnecessary splitting of buffers that
appears to happend with continuous preparations of prepared statements.
This commit is contained in:
Markus Mäkelä
2017-06-21 11:14:11 +03:00
parent 33a0f8be88
commit 705d29ea41
2 changed files with 20 additions and 11 deletions
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29
server/modules/protocol/MySQL/MySQLBackend/mysql_backend.c
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@ -808,18 +808,27 @@ gw_read_and_write(DCB *dcb)
*/
if (protocol_get_srv_command((MySQLProtocol *)dcb->protocol, true) != MYSQL_COM_UNDEFINED)
{
stmt = process_response_data(dcb, &read_buffer, gwbuf_length(read_buffer));
/**
* Received incomplete response to session command.
* Store it to readqueue and return.
*/
if (!sescmd_response_complete(dcb))
if (result_collected)
{
stmt = gwbuf_append(stmt, read_buffer);
dcb->dcb_readqueue = gwbuf_append(stmt, dcb->dcb_readqueue);
return 0;
/** The result set or PS response was collected, we know it's complete */
stmt = read_buffer;
read_buffer = NULL;
gwbuf_set_type(stmt, GWBUF_TYPE_RESPONSE_END | GWBUF_TYPE_SESCMD_RESPONSE);
}
else
{
stmt = process_response_data(dcb, &read_buffer, gwbuf_length(read_buffer));
/**
* Received incomplete response to session command.
* Store it to readqueue and return.
*/
if (!sescmd_response_complete(dcb))
{
stmt = gwbuf_append(stmt, read_buffer);
dcb->dcb_readqueue = gwbuf_append(stmt, dcb->dcb_readqueue);
return 0;
}
}
if (!stmt)
{
MXS_ERROR("Read buffer unexpectedly null, even though response "