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MXS-1459: Assign binlog checksum value at startup

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Binlog checksum default value is wrong if a slave connects with
checksum = NONE before master registration or master is not accessible
at startup
This commit is contained in:
MassimilianoPinto
2017-09-29 18:57:09 +02:00
parent 32709b3e46
commit 1827f042e8
2 changed files with 38 additions and 9 deletions
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14
server/modules/routing/binlogrouter/blr.c
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@ -124,6 +124,8 @@ static void stats_func(void *);
static bool rses_begin_locked_router_action(ROUTER_SLAVE *);
static void rses_end_locked_router_action(ROUTER_SLAVE *);
GWBUF *blr_cache_read_response(ROUTER_INSTANCE *router, char *response);
/* Set checksum value in router instance from a master reply or saved buffer */
extern void blr_set_checksum(ROUTER_INSTANCE *instance, GWBUF *buf);
static SPINLOCK instlock;
static ROUTER_INSTANCE *instances;
@ -828,6 +830,18 @@ createInstance(SERVICE *service, char **options)
/* Read any cached response messages */
blr_cache_read_master_data(inst);
/**
* The value of master checksum is known only at registration time, so
* as soon as replication succeds the value is updated.
* Set now the binlog checksum from the saved value.
* This is very useful in case of possible failure in the
* registration phase for any reason: master is down, wrong password etc.
* In this case a connecting slave will get the checksum value
* from previous registration instead of default one (CRC32)
* which can be wrong if slave has binlog_checksum = NONE.
*/
blr_set_checksum(inst, inst->saved_master.chksum2);
/* Find latest binlog file or create a new one (000001) */
if (blr_file_init(inst) == 0)
{