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Save and restore master info in rdb to allow active replica partial sync (#371)

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* save replid for all masters in rdb

* expanded rdbSaveInfo to hold multiple master structs

* parse repl-masters from rdb

* recover replid info from rdb in active replica mode, attempt partial sync

* save offset from rdb into correct variable

* don't change replid based on master in active rep

* save and load psync info from correct fields
This commit is contained in:
Christian Legge 2022-01-12 19:49:15 -05:00 committed by Vivek Saini
parent 05bfd007f3
commit c81cc4ee2b
6 changed files with 224 additions and 75 deletions
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2
src/aof.cpp
View File

@ -884,7 +884,7 @@ int loadAppendOnlyFile(char *filename) {
} else {
/* RDB preamble. Pass loading the RDB functions. */
rio rdb;
rdbSaveInfo rsi = RDB_SAVE_INFO_INIT;
rdbSaveInfo rsi;
serverLog(LL_NOTICE,"Reading RDB preamble from AOF file...");
if (fseek(fp,0,SEEK_SET) == -1) goto readerr;

61
src/rdb.cpp
View File

@ -1218,6 +1218,40 @@ int rdbSaveInfoAuxFields(rio *rdb, int rdbflags, rdbSaveInfo *rsi) {
== -1) return -1;
if (rdbSaveAuxFieldStrInt(rdb,"repl-offset",rsi->master_repl_offset)
== -1) return -1;
if (g_pserver->fActiveReplica && listLength(g_pserver->masters) > 0) {
sdsstring val = sdsstring(sdsempty());
listNode *ln;
listIter li;
redisMaster* mi;
listRewind(g_pserver->masters,&li);
while ((ln = listNext(&li)) != NULL) {
mi = (redisMaster*)listNodeValue(ln);
if (!mi->master) {
// If master client is not available, use info from master struct - better than nothing
serverLog(LL_NOTICE, "saving master %s", mi->master_replid);
if (mi->master_replid[0] == 0) {
// if replid is null, there's no reason to save it
continue;
}
val = val.catfmt("%s:%I:%s:%i;", mi->master_replid,
mi->master_initial_offset,
mi->masterhost,
mi->masterport);
}
else {
serverLog(LL_NOTICE, "saving master %s", mi->master->replid);
if (mi->master->replid[0] == 0) {
// if replid is null, there's no reason to save it
continue;
}
val = val.catfmt("%s:%I:%s:%i;", mi->master->replid,
mi->master->reploff,
mi->masterhost,
mi->masterport);
}
}
if (rdbSaveAuxFieldStrStr(rdb, "repl-masters",val.get()) == -1) return -1;
}
}
if (rdbSaveAuxFieldStrInt(rdb,"aof-preamble",aof_preamble) == -1) return -1;
return 1;
@ -1628,7 +1662,7 @@ int launchRdbSaveThread(pthread_t &child, rdbSaveInfo *rsi)
} else
{
rdbSaveThreadArgs *args = (rdbSaveThreadArgs*)zmalloc(sizeof(rdbSaveThreadArgs) + ((cserver.dbnum-1)*sizeof(redisDbPersistentDataSnapshot*)), MALLOC_LOCAL);
rdbSaveInfo rsiT = RDB_SAVE_INFO_INIT;
rdbSaveInfo rsiT;
if (rsi == nullptr)
rsi = &rsiT;
memcpy(&args->rsi, rsi, sizeof(rdbSaveInfo));
@ -2888,11 +2922,11 @@ public:
* snapshot taken by the master may not be reflected on the replica. */
bool fExpiredKey = iAmMaster() && !(this->rdbflags&RDBFLAGS_AOF_PREAMBLE) && job.expiretime != INVALID_EXPIRE && job.expiretime < this->now;
if (fStaleMvccKey || fExpiredKey) {
if (fStaleMvccKey && !fExpiredKey && this->rsi != nullptr && this->rsi->mi != nullptr && this->rsi->mi->staleKeyMap != nullptr && lookupKeyRead(job.db, &keyobj) == nullptr) {
if (fStaleMvccKey && !fExpiredKey && this->rsi != nullptr && this->rsi->masters != nullptr && this->rsi->masters->staleKeyMap != nullptr && lookupKeyRead(job.db, &keyobj) == nullptr) {
// We have a key that we've already deleted and is not back in our database.
// We'll need to inform the sending master of the delete if it is also a replica of us
robj_sharedptr objKeyDup(createStringObject(job.key, sdslen(job.key)));
this->rsi->mi->staleKeyMap->operator[](job.db->id).push_back(objKeyDup);
this->rsi->masters->staleKeyMap->operator[](job.db->id).push_back(objKeyDup);
}
sdsfree(job.key);
job.key = nullptr;
@ -3206,6 +3240,23 @@ int rdbLoadRio(rio *rdb, int rdbflags, rdbSaveInfo *rsi) {
memcpy(rsi->repl_id,ptrFromObj(auxval),CONFIG_RUN_ID_SIZE+1);
rsi->repl_id_is_set = 1;
}
} else if (!strcasecmp(szFromObj(auxkey),"repl-masters")) {
if (rsi) {
struct redisMaster mi;
char *masters = szFromObj(auxval);
char *entry = strtok(masters, ":");
while (entry != NULL) {
memcpy(mi.master_replid, entry, sizeof(mi.master_replid));
entry = strtok(NULL, ":");
mi.master_initial_offset = atoi(entry);
entry = strtok(NULL, ":");
mi.masterhost = entry;
entry = strtok(NULL, ";");
mi.masterport = atoi(entry);
entry = strtok(NULL, ":");
rsi->addMaster(mi);
}
}
} else if (!strcasecmp(szFromObj(auxkey),"repl-offset")) {
if (rsi) rsi->repl_offset = strtoll(szFromObj(auxval),NULL,10);
} else if (!strcasecmp(szFromObj(auxkey),"lua")) {
@ -3861,8 +3912,8 @@ void bgsaveCommand(client *c) {
* is returned, and the RDB saving will not persist any replication related
* information. */
rdbSaveInfo *rdbPopulateSaveInfo(rdbSaveInfo *rsi) {
rdbSaveInfo rsi_init = RDB_SAVE_INFO_INIT;
*rsi = rsi_init;
rdbSaveInfo rsi_init;
*rsi = std::move(rsi_init);
memcpy(rsi->repl_id, g_pserver->replid, sizeof(g_pserver->replid));
rsi->master_repl_offset = g_pserver->master_repl_offset;

43
src/replication.cpp
View File

@ -2954,7 +2954,7 @@ bool readSyncBulkPayloadRdb(connection *conn, redisMaster *mi, rdbSaveInfo &rsi,
mi->staleKeyMap->clear();
else
mi->staleKeyMap = new (MALLOC_LOCAL) std::map<int, std::vector<robj_sharedptr>>();
rsi.mi = mi;
rsi.addMaster(*mi);
}
if (rdbLoadFile(rdb_filename,&rsi,RDBFLAGS_REPLICATION) != C_OK) {
serverLog(LL_WARNING,
@ -2994,7 +2994,7 @@ error:
}
void readSyncBulkPayload(connection *conn) {
rdbSaveInfo rsi = RDB_SAVE_INFO_INIT;
rdbSaveInfo rsi;
redisMaster *mi = (redisMaster*)connGetPrivateData(conn);
static int usemark = 0;
if (mi == nullptr) {
@ -3043,7 +3043,7 @@ void readSyncBulkPayload(connection *conn) {
{
mergeReplicationId(mi->master->replid);
}
else
else if (!g_pserver->fActiveReplica)
{
/* After a full resynchroniziation we use the replication ID and
* offset of the master. The secondary ID / offset are cleared since
@ -3238,7 +3238,7 @@ int slaveTryPartialResynchronization(redisMaster *mi, connection *conn, int read
* client structure representing the master into g_pserver->master. */
mi->master_initial_offset = -1;
if (mi->cached_master && !g_pserver->fActiveReplica) {
if (mi->cached_master) {
psync_replid = mi->cached_master->replid;
snprintf(psync_offset,sizeof(psync_offset),"%lld", mi->cached_master->reploff+1);
serverLog(LL_NOTICE,"Trying a partial resynchronization (request %s:%s).", psync_replid, psync_offset);
@ -3337,16 +3337,17 @@ int slaveTryPartialResynchronization(redisMaster *mi, connection *conn, int read
sizeof(g_pserver->replid2));
g_pserver->second_replid_offset = g_pserver->master_repl_offset+1;
if (!g_pserver->fActiveReplica) {
/* Update the cached master ID and our own primary ID to the
* new one. */
memcpy(g_pserver->replid,sznew,sizeof(g_pserver->replid));
memcpy(mi->cached_master->replid,sznew,sizeof(g_pserver->replid));
/* Disconnect all the sub-slaves: they need to be notified. */
if (!g_pserver->fActiveReplica)
disconnectSlaves();
}
}
}
/* Setup the replication to continue. */
sdsfree(reply);
@ -3725,18 +3726,6 @@ retry_connect:
disconnectSlavesExcept(mi->master_uuid); /* Force our slaves to resync with us as well. */
freeReplicationBacklog(); /* Don't allow our chained slaves to PSYNC. */
}
else
{
if (listLength(g_pserver->slaves))
{
changeReplicationId();
clearReplicationId2();
}
else
{
freeReplicationBacklog(); /* Don't allow our chained slaves to PSYNC. */
}
}
/* Fall back to SYNC if needed. Otherwise psync_result == PSYNC_FULLRESYNC
* and the g_pserver->master_replid and master_initial_offset are
@ -4405,6 +4394,26 @@ void replicationCacheMasterUsingMyself(redisMaster *mi) {
mi->master = NULL;
}
/* This function is called when reloading master info from an RDB in Active Replica mode.
* It creates a cached master client using the info contained in the redisMaster struct.
*
* Assumes that the passed struct contains valid master info. */
void replicationCacheMasterUsingMaster(redisMaster *mi) {
if (mi->cached_master) {
freeClient(mi->cached_master);
}
replicationCreateMasterClient(mi, NULL, -1);
std::lock_guard<decltype(mi->master->lock)> lock(mi->master->lock);
memcpy(mi->master->replid, mi->master_replid, sizeof(mi->master_replid));
mi->master->reploff = mi->master_initial_offset;
unlinkClient(mi->master);
mi->cached_master = mi->master;
mi->master = NULL;
}
/* Free a cached master, called when there are no longer the conditions for
* a partial resync on reconnection. */
void replicationDiscardCachedMaster(redisMaster *mi) {

15
src/sds.h
View File

@ -429,6 +429,21 @@ public:
return *this;
}
sdsstring &operator=(sdsstring &&other)
{
sds tmp = m_str;
m_str = other.m_str;
other.m_str = tmp;
return *this;
}
template<typename... Args>
sdsstring catfmt(const char *fmt, Args... args)
{
m_str = sdscatfmt(m_str, fmt, args...);
return *this;
}
sds release() {
sds sdsT = m_str;
m_str = nullptr;

16
src/server.cpp
View File

@ -6940,7 +6940,7 @@ void loadDataFromDisk(void) {
if (loadAppendOnlyFile(g_pserver->aof_filename) == C_OK)
serverLog(LL_NOTICE,"DB loaded from append only file: %.3f seconds",(float)(ustime()-start)/1000000);
} else if (g_pserver->rdb_filename != NULL || g_pserver->rdb_s3bucketpath != NULL) {
rdbSaveInfo rsi = RDB_SAVE_INFO_INIT;
rdbSaveInfo rsi;
rsi.fForceSetKey = false;
errno = 0; /* Prevent a stale value from affecting error checking */
if (rdbLoad(&rsi,RDBFLAGS_NONE) == C_OK) {
@ -6969,6 +6969,17 @@ void loadDataFromDisk(void) {
while ((ln = listNext(&li)))
{
redisMaster *mi = (redisMaster*)listNodeValue(ln);
if (g_pserver->fActiveReplica) {
for (size_t i = 0; i < rsi.numMasters(); i++) {
if (!strcmp(mi->masterhost, rsi.masters[i].masterhost) && mi->masterport == rsi.masters[i].masterport) {
memcpy(mi->master_replid, rsi.masters[i].master_replid, sizeof(mi->master_replid));
mi->master_initial_offset = rsi.masters[i].master_initial_offset;
replicationCacheMasterUsingMaster(mi);
serverLog(LL_NOTICE, "Cached master recovered from RDB for %s:%d", mi->masterhost, mi->masterport);
}
}
}
else {
/* If we are a replica, create a cached master from this
* information, in order to allow partial resynchronizations
* with masters. */
@ -6976,6 +6987,7 @@ void loadDataFromDisk(void) {
selectDb(mi->cached_master,rsi.repl_stream_db);
}
}
}
} else if (errno != ENOENT) {
serverLog(LL_WARNING,"Fatal error loading the DB: %s. Exiting.",strerror(errno));
exit(1);
@ -7596,7 +7608,7 @@ int main(int argc, char **argv) {
__AFL_INIT();
#endif
rio rdb;
rdbSaveInfo rsi = RDB_SAVE_INFO_INIT;
rdbSaveInfo rsi;
startLoadingFile(stdin, (char*)"stdin", 0);
rioInitWithFile(&rdb,stdin);
rdbLoadRio(&rdb,0,&rsi);

142
src/server.h
View File

@ -1850,6 +1850,43 @@ struct redisMemOverhead {
} *db;
};
struct redisMaster {
char *masteruser; /* AUTH with this user and masterauth with master */
char *masterauth; /* AUTH with this password with master */
char *masterhost; /* Hostname of master */
int masterport; /* Port of master */
client *cached_master; /* Cached master to be reused for PSYNC. */
client *master;
/* The following two fields is where we store master PSYNC replid/offset
* while the PSYNC is in progress. At the end we'll copy the fields into
* the server->master client structure. */
char master_replid[CONFIG_RUN_ID_SIZE+1]; /* Master PSYNC runid. */
long long master_initial_offset; /* Master PSYNC offset. */
bool isActive = false;
bool isRocksdbSnapshotRepl = false;
int repl_state; /* Replication status if the instance is a replica */
off_t repl_transfer_size; /* Size of RDB to read from master during sync. */
off_t repl_transfer_read; /* Amount of RDB read from master during sync. */
off_t repl_transfer_last_fsync_off; /* Offset when we fsync-ed last time. */
connection *repl_transfer_s; /* Slave -> Master SYNC socket */
int repl_transfer_fd; /* Slave -> Master SYNC temp file descriptor */
char *repl_transfer_tmpfile; /* Slave-> master SYNC temp file name */
time_t repl_transfer_lastio; /* Unix time of the latest read, for timeout */
time_t repl_down_since; /* Unix time at which link with master went down */
class SnapshotPayloadParseState *parseState;
sds bulkreadBuffer = nullptr;
unsigned char master_uuid[UUID_BINARY_LEN]; /* Used during sync with master, this is our master's UUID */
/* After we've connected with our master use the UUID in g_pserver->master */
uint64_t mvccLastSync;
/* During a handshake the server may have stale keys, we track these here to share once a reciprocal connection is made */
std::map<int, std::vector<robj_sharedptr>> *staleKeyMap;
int ielReplTransfer = -1;
};
/* This structure can be optionally passed to RDB save/load functions in
* order to implement additional functionalities, by storing and loading
* metadata to the RDB file.
@ -1858,7 +1895,66 @@ struct redisMemOverhead {
* replication in order to make sure that chained slaves (slaves of slaves)
* select the correct DB and are able to accept the stream coming from the
* top-level master. */
typedef struct rdbSaveInfo {
class rdbSaveInfo {
public:
rdbSaveInfo() {
repl_stream_db = -1;
repl_id_is_set = 0;
memcpy(repl_id, "0000000000000000000000000000000000000000", sizeof(repl_id));
repl_offset = -1;
fForceSetKey = TRUE;
mvccMinThreshold = 0;
masters = nullptr;
masterCount = 0;
}
rdbSaveInfo(const rdbSaveInfo &other) {
repl_stream_db = other.repl_stream_db;
repl_id_is_set = other.repl_id_is_set;
memcpy(repl_id, other.repl_id, sizeof(repl_id));
repl_offset = other.repl_offset;
fForceSetKey = other.fForceSetKey;
mvccMinThreshold = other.mvccMinThreshold;
masters = (struct redisMaster*)malloc(sizeof(struct redisMaster) * other.masterCount);
memcpy(masters, other.masters, sizeof(struct redisMaster) * other.masterCount);
masterCount = other.masterCount;
}
rdbSaveInfo(rdbSaveInfo &&other) : rdbSaveInfo() {
swap(*this, other);
}
rdbSaveInfo &operator=(rdbSaveInfo other) {
swap(*this, other);
return *this;
}
~rdbSaveInfo() {
free(masters);
}
friend void swap(rdbSaveInfo &first, rdbSaveInfo &second) {
std::swap(first.repl_stream_db, second.repl_stream_db);
std::swap(first.repl_id_is_set, second.repl_id_is_set);
std::swap(first.repl_id, second.repl_id);
std::swap(first.repl_offset, second.repl_offset);
std::swap(first.fForceSetKey, second.fForceSetKey);
std::swap(first.mvccMinThreshold, second.mvccMinThreshold);
std::swap(first.masters, second.masters);
std::swap(first.masterCount, second.masterCount);
}
void addMaster(const struct redisMaster &mi) {
masterCount++;
if (masters == nullptr) {
masters = (struct redisMaster*)malloc(sizeof(struct redisMaster));
}
else {
masters = (struct redisMaster*)realloc(masters, sizeof(struct redisMaster) * masterCount);
}
memcpy(masters + masterCount - 1, &mi, sizeof(struct redisMaster));
}
size_t numMasters() {
return masterCount;
}
/* Used saving and loading. */
int repl_stream_db; /* DB to select in g_pserver->master client. */
@ -1872,10 +1968,11 @@ typedef struct rdbSaveInfo {
long long master_repl_offset;
uint64_t mvccMinThreshold;
struct redisMaster *mi;
} rdbSaveInfo;
struct redisMaster *masters;
#define RDB_SAVE_INFO_INIT {-1,0,"0000000000000000000000000000000000000000",-1, TRUE, 0, 0, nullptr}
private:
size_t masterCount;
};
struct malloc_stats {
size_t zmalloc_used;
@ -2081,42 +2178,6 @@ private:
int rdb_key_save_delay = -1; // thread local cache
};
struct redisMaster {
char *masteruser; /* AUTH with this user and masterauth with master */
char *masterauth; /* AUTH with this password with master */
char *masterhost; /* Hostname of master */
int masterport; /* Port of master */
client *cached_master; /* Cached master to be reused for PSYNC. */
client *master;
/* The following two fields is where we store master PSYNC replid/offset
* while the PSYNC is in progress. At the end we'll copy the fields into
* the server->master client structure. */
char master_replid[CONFIG_RUN_ID_SIZE+1]; /* Master PSYNC runid. */
long long master_initial_offset; /* Master PSYNC offset. */
bool isActive = false;
bool isRocksdbSnapshotRepl = false;
int repl_state; /* Replication status if the instance is a replica */
off_t repl_transfer_size; /* Size of RDB to read from master during sync. */
off_t repl_transfer_read; /* Amount of RDB read from master during sync. */
off_t repl_transfer_last_fsync_off; /* Offset when we fsync-ed last time. */
connection *repl_transfer_s; /* Slave -> Master SYNC socket */
int repl_transfer_fd; /* Slave -> Master SYNC temp file descriptor */
char *repl_transfer_tmpfile; /* Slave-> master SYNC temp file name */
time_t repl_transfer_lastio; /* Unix time of the latest read, for timeout */
time_t repl_down_since; /* Unix time at which link with master went down */
class SnapshotPayloadParseState *parseState;
sds bulkreadBuffer = nullptr;
unsigned char master_uuid[UUID_BINARY_LEN]; /* Used during sync with master, this is our master's UUID */
/* After we've connected with our master use the UUID in g_pserver->master */
uint64_t mvccLastSync;
/* During a handshake the server may have stale keys, we track these here to share once a reciprocal connection is made */
std::map<int, std::vector<robj_sharedptr>> *staleKeyMap;
int ielReplTransfer = -1;
};
// Const vars are not changed after worker threads are launched
struct redisServerConst {
pid_t pid; /* Main process pid. */
@ -3101,6 +3162,7 @@ void clearReplicationId2(void);
void mergeReplicationId(const char *);
void chopReplicationBacklog(void);
void replicationCacheMasterUsingMyself(struct redisMaster *mi);
void replicationCacheMasterUsingMaster(struct redisMaster *mi);
void feedReplicationBacklog(const void *ptr, size_t len);
void updateMasterAuth();
void showLatestBacklog();