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Take SessionCommand into use in readwritesplit

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Readwritesplit now uses the SessionCommand class as a "master list" of
executed session commands. This allows the session commands to be easily
copied over to slaves that are taken into use after session commands have
already been executed.

Currently, the code doesn't execute the session command history when a
mid-session reconnection occurs. A method to cleanly copy the session
commands needs to be exposed by the Backend class.
This commit is contained in:
Markus Mäkelä
2017-06-15 20:42:20 +03:00
parent b48bb4fc5e
commit 0c45eb5d17
6 changed files with 100 additions and 828 deletions
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3
server/modules/routing/readwritesplit/readwritesplit.cc
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@ -775,6 +775,7 @@ static MXS_ROUTER_SESSION *newSession(MXS_ROUTER *router_inst, MXS_SESSION *sess
client_rses->load_data_state = LOAD_DATA_INACTIVE;
client_rses->sent_sescmd = 0;
client_rses->recv_sescmd = 0;
client_rses->sescmd_count = 1; // Needs to be a positive number to work
memcpy(&client_rses->rses_config, &router->rwsplit_config, sizeof(client_rses->rses_config));
int router_nservers = router->service->n_dbref;
@ -977,7 +978,7 @@ static void diagnostics(MXS_ROUTER *instance, DCB *dcb)
router->rwsplit_config.strict_multi_stmt ? "true" : "false");
dcb_printf(dcb, "\tdisable_sescmd_history: %s\n",
router->rwsplit_config.disable_sescmd_history ? "true" : "false");
dcb_printf(dcb, "\tmax_sescmd_history: %d\n",
dcb_printf(dcb, "\tmax_sescmd_history: %lu\n",
router->rwsplit_config.max_sescmd_history);
dcb_printf(dcb, "\tmaster_accept_reads: %s\n",
router->rwsplit_config.master_accept_reads ? "true" : "false");