Configurable synchronous I/O timeout

src/redis.c

@@ -871,6 +871,7 @@ void initServerConfig() {
     server.masterport = 6379;
     server.master = NULL;
     server.replstate = REDIS_REPL_NONE;
+    server.repl_syncio_timeout = REDIS_REPL_SYNCIO_TIMEOUT;
     server.repl_serve_stale_data = 1;
 
     /* Double constants initialization */

src/redis.h

@@ -159,6 +159,9 @@
 #define REDIS_REPL_TRANSFER 3 /* Receiving .rdb from master */
 #define REDIS_REPL_CONNECTED 4 /* Connected to master */
 
+/* Synchronous read timeout - slave side */
+#define REDIS_REPL_SYNCIO_TIMEOUT 5
+
 /* Slave replication state - from the point of view of master
  * Note that in SEND_BULK and ONLINE state the slave receives new updates
  * in its output queue. In the WAIT_BGSAVE state instead the server is waiting
@@ -586,6 +589,7 @@ struct redisServer {
     char *masterhost;
     int masterport;
     redisClient *master;    /* client that is master for this slave */
+    int repl_syncio_timeout; /* timeout for synchronous I/O calls */
     int replstate;          /* replication status if the instance is a slave */
     off_t repl_transfer_left;  /* bytes left reading .rdb  */
     int repl_transfer_s;    /* slave -> master SYNC socket */

src/replication.c

@@ -315,7 +315,7 @@ void readSyncBulkPayload(aeEventLoop *el, int fd, void *privdata, int mask) {
     /* If repl_transfer_left == -1 we still have to read the bulk length
      * from the master reply. */
     if (server.repl_transfer_left == -1) {
-        if (syncReadLine(fd,buf,1024,3600) == -1) {
+        if (syncReadLine(fd,buf,1024,server.repl_syncio_timeout) == -1) {
             redisLog(REDIS_WARNING,
                 "I/O error reading bulk count from MASTER: %s",
                 strerror(errno));
@@ -414,13 +414,13 @@ void syncWithMaster(aeEventLoop *el, int fd, void *privdata, int mask) {
         size_t authlen;
 
         authlen = snprintf(authcmd,sizeof(authcmd),"AUTH %s\r\n",server.masterauth);
-        if (syncWrite(fd,authcmd,authlen,5) == -1) {
+        if (syncWrite(fd,authcmd,authlen,server.repl_syncio_timeout) == -1) {
             redisLog(REDIS_WARNING,"Unable to AUTH to MASTER: %s",
                 strerror(errno));
             goto error;
         }
         /* Read the AUTH result.  */
-        if (syncReadLine(fd,buf,1024,3600) == -1) {
+        if (syncReadLine(fd,buf,1024,server.repl_syncio_timeout) == -1) {
             redisLog(REDIS_WARNING,"I/O error reading auth result from MASTER: %s",
                 strerror(errno));
             goto error;
@@ -432,7 +432,7 @@ void syncWithMaster(aeEventLoop *el, int fd, void *privdata, int mask) {
     }
 
     /* Issue the SYNC command */
-    if (syncWrite(fd,"SYNC \r\n",7,5) == -1) {
+    if (syncWrite(fd,"SYNC \r\n",7,server.repl_syncio_timeout) == -1) {
         redisLog(REDIS_WARNING,"I/O error writing to MASTER: %s",
             strerror(errno));
         goto error;