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Addition of cache for server responses. This allows cached responses to be sent

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if there is no master avaiable when MaxScale starts
This commit is contained in:
Mark Riddoch
2015-01-28 08:44:13 +00:00
parent b758dc1a4a
commit 0a9509168b
5 changed files with 178 additions and 1 deletions
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71
server/modules/routing/binlog/blr_master.c
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@ -48,6 +48,7 @@
#include <dcb.h>
#include <spinlock.h>
#include <housekeeper.h>
#include <buffer.h>
#include <sys/types.h>
#include <sys/socket.h>
@ -370,7 +371,10 @@ char query[128];
break;
case BLRM_SERVERID:
// Response to fetch of master's server-id
if (router->saved_master.server_id)
GWBUF_CONSUME_ALL(router->saved_master.server_id);
router->saved_master.server_id = buf;
blr_cache_response(router, "serverid", buf);
// TODO: Extract the value of server-id and place in router->master_id
{
char str[80];
@ -382,35 +386,50 @@ char query[128];
break;
case BLRM_HBPERIOD:
// Response to set the heartbeat period
if (router->saved_master.heartbeat)
GWBUF_CONSUME_ALL(router->saved_master.heartbeat);
router->saved_master.heartbeat = buf;
blr_cache_response(router, "heartbeat", buf);
buf = blr_make_query("SET @master_binlog_checksum = @@global.binlog_checksum");
router->master_state = BLRM_CHKSUM1;
router->master->func.write(router->master, buf);
break;
case BLRM_CHKSUM1:
// Response to set the master binlog checksum
if (router->saved_master.chksum1)
GWBUF_CONSUME_ALL(router->saved_master.chksum1);
router->saved_master.chksum1 = buf;
blr_cache_response(router, "chksum1", buf);
buf = blr_make_query("SELECT @master_binlog_checksum");
router->master_state = BLRM_CHKSUM2;
router->master->func.write(router->master, buf);
break;
case BLRM_CHKSUM2:
// Response to the master_binlog_checksum, should be stored
if (router->saved_master.chksum2)
GWBUF_CONSUME_ALL(router->saved_master.chksum2);
router->saved_master.chksum2 = buf;
blr_cache_response(router, "chksum2", buf);
buf = blr_make_query("SELECT @@GLOBAL.GTID_MODE");
router->master_state = BLRM_GTIDMODE;
router->master->func.write(router->master, buf);
break;
case BLRM_GTIDMODE:
// Response to the GTID_MODE, should be stored
if (router->saved_master.gtid_mode)
GWBUF_CONSUME_ALL(router->saved_master.gtid_mode);
router->saved_master.gtid_mode = buf;
blr_cache_response(router, "gtidmode", buf);
buf = blr_make_query("SHOW VARIABLES LIKE 'SERVER_UUID'");
router->master_state = BLRM_MUUID;
router->master->func.write(router->master, buf);
break;
case BLRM_MUUID:
// Response to the SERVER_UUID, should be stored
if (router->saved_master.uuid)
GWBUF_CONSUME_ALL(router->saved_master.uuid);
router->saved_master.uuid = buf;
blr_cache_response(router, "uuid", buf);
sprintf(query, "SET @slave_uuid='%s'", router->uuid);
buf = blr_make_query(query);
router->master_state = BLRM_SUUID;
@ -418,56 +437,80 @@ char query[128];
break;
case BLRM_SUUID:
// Response to the SET @server_uuid, should be stored
if (router->saved_master.setslaveuuid)
GWBUF_CONSUME_ALL(router->saved_master.setslaveuuid);
router->saved_master.setslaveuuid = buf;
blr_cache_response(router, "ssuuid", buf);
buf = blr_make_query("SET NAMES latin1");
router->master_state = BLRM_LATIN1;
router->master->func.write(router->master, buf);
break;
case BLRM_LATIN1:
// Response to the SET NAMES latin1, should be stored
if (router->saved_master.setnames)
GWBUF_CONSUME_ALL(router->saved_master.setnames);
router->saved_master.setnames = buf;
blr_cache_response(router, "setnames", buf);
buf = blr_make_query("SET NAMES utf8");
router->master_state = BLRM_UTF8;
router->master->func.write(router->master, buf);
break;
case BLRM_UTF8:
// Response to the SET NAMES utf8, should be stored
if (router->saved_master.utf8)
GWBUF_CONSUME_ALL(router->saved_master.utf8);
router->saved_master.utf8 = buf;
blr_cache_response(router, "utf8", buf);
buf = blr_make_query("SELECT 1");
router->master_state = BLRM_SELECT1;
router->master->func.write(router->master, buf);
break;
case BLRM_SELECT1:
// Response to the SELECT 1, should be stored
if (router->saved_master.select1)
GWBUF_CONSUME_ALL(router->saved_master.select1);
router->saved_master.select1 = buf;
blr_cache_response(router, "select1", buf);
buf = blr_make_query("SELECT VERSION();");
router->master_state = BLRM_SELECTVER;
router->master->func.write(router->master, buf);
break;
case BLRM_SELECTVER:
// Response to SELECT VERSION should be stored
if (router->saved_master.selectver)
GWBUF_CONSUME_ALL(router->saved_master.selectver);
router->saved_master.selectver = buf;
blr_cache_response(router, "selectver", buf);
buf = blr_make_query("SELECT @@version_comment limit 1;");
router->master_state = BLRM_SELECTVERCOM;
router->master->func.write(router->master, buf);
break;
case BLRM_SELECTVERCOM:
// Response to SELECT @@version_comment should be stored
if (router->saved_master.selectvercom)
GWBUF_CONSUME_ALL(router->saved_master.selectvercom);
router->saved_master.selectvercom = buf;
blr_cache_response(router, "selectvercom", buf);
buf = blr_make_query("SELECT @@hostname;");
router->master_state = BLRM_SELECTHOSTNAME;
router->master->func.write(router->master, buf);
break;
case BLRM_SELECTHOSTNAME:
// Response to SELECT @@hostname should be stored
if (router->saved_master.selecthostname)
GWBUF_CONSUME_ALL(router->saved_master.selecthostname);
router->saved_master.selecthostname = buf;
blr_cache_response(router, "selecthostname", buf);
buf = blr_make_query("SELECT @@max_allowed_packet;");
router->master_state = BLRM_MAP;
router->master->func.write(router->master, buf);
break;
case BLRM_MAP:
// Response to SELECT @@max_allowed_packet should be stored
if (router->saved_master.map)
GWBUF_CONSUME_ALL(router->saved_master.map);
router->saved_master.map = buf;
blr_cache_response(router, "map", buf);
buf = blr_make_registration(router);
router->master_state = BLRM_REGISTER;
router->master->func.write(router->master, buf);
@ -800,6 +843,34 @@ static REP_HEADER phdr;
phdr = hdr;
if (hdr.ok == 0)
{
#define CHECK_CRC 1
#if CHECK_CRC
uint32_t chksum, pktsum;
chksum = crc32(0L, NULL, 0);
chksum = crc32(chksum, ptr + 5, hdr.event_size - 4);
pktsum = EXTRACT32(ptr + hdr.event_size + 1);
if (pktsum != chksum)
{
router->stats.n_badcrc++;
if (msg)
{
free(msg);
msg = NULL;
}
LOGIF(LE,(skygw_log_write(LOGFILE_ERROR,
"%s: Checksum error in event "
"from master, "
"binlog %s @ %d. "
"Closing master connection.",
router->service->name,
router->binlog_name,
router->binlog_position)));
blr_master_close(router);
blr_master_delayed_connect(router);
return;
}
#endif
router->stats.n_binlogs++;
router->lastEventReceived = hdr.event_type;