Exemple #1
0
int main(int argc, char **argv) {
    time_t start;

    initServerConfig();
    if (argc == 2) {
        resetServerSaveParams();
        loadServerConfig(argv[1]);
    } 

    if (server.daemonize) daemonize();
    initServer();
   
    linuxOvercommitMemoryWarning();
    start = time(NULL);
    if (server.appendonly) {
        loadAppendOnlyFile(server.appendfilename);
    } else {
        rdbLoad(server.dbfilename);
    }

    aeSetBeforeSleepProc(server.el,beforeSleep);
    aeMain(server.el);
    aeDeleteEventLoop(server.el);
   
    return 0;
}
Exemple #2
0
/* Asynchronously read the SYNC payload we receive from a master */
void readSyncBulkPayload(aeEventLoop *el, int fd, void *privdata, int mask) {
    char buf[4096];
    ssize_t nread, readlen;
    REDIS_NOTUSED(el);
    REDIS_NOTUSED(privdata);
    REDIS_NOTUSED(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) {
            redisLog(REDIS_WARNING,
                "I/O error reading bulk count from MASTER: %s",
                strerror(errno));
            replicationAbortSyncTransfer();
            return;
        }
        if (buf[0] == '-') {
            redisLog(REDIS_WARNING,
                "MASTER aborted replication with an error: %s",
                buf+1);
            replicationAbortSyncTransfer();
            return;
        } else if (buf[0] == '\0') {
            /* At this stage just a newline works as a PING in order to take
             * the connection live. So we refresh our last interaction
             * timestamp. */
            server.repl_transfer_lastio = time(NULL);
            return;
        } else if (buf[0] != '$') {
            redisLog(REDIS_WARNING,"Bad protocol from MASTER, the first byte is not '$', are you sure the host and port are right?");
            replicationAbortSyncTransfer();
            return;
        }
        server.repl_transfer_left = strtol(buf+1,NULL,10);
        redisLog(REDIS_NOTICE,
            "MASTER <-> SLAVE sync: receiving %ld bytes from master",
            server.repl_transfer_left);
        return;
    }

    /* Read bulk data */
    readlen = (server.repl_transfer_left < (signed)sizeof(buf)) ?
        server.repl_transfer_left : (signed)sizeof(buf);
    nread = read(fd,buf,readlen);
    if (nread <= 0) {
        redisLog(REDIS_WARNING,"I/O error trying to sync with MASTER: %s",
            (nread == -1) ? strerror(errno) : "connection lost");
        replicationAbortSyncTransfer();
        return;
    }
    server.repl_transfer_lastio = time(NULL);
    if (write(server.repl_transfer_fd,buf,nread) != nread) {
        redisLog(REDIS_WARNING,"Write error or short write writing to the DB dump file needed for MASTER <-> SLAVE synchrnonization: %s", strerror(errno));
        replicationAbortSyncTransfer();
        return;
    }
    server.repl_transfer_left -= nread;
    /* Check if the transfer is now complete */
    if (server.repl_transfer_left == 0) {
        if (rename(server.repl_transfer_tmpfile,server.dbfilename) == -1) {
            redisLog(REDIS_WARNING,"Failed trying to rename the temp DB into dump.rdb in MASTER <-> SLAVE synchronization: %s", strerror(errno));
            replicationAbortSyncTransfer();
            return;
        }
        redisLog(REDIS_NOTICE, "MASTER <-> SLAVE sync: Loading DB in memory");
        emptyDb();
        /* Before loading the DB into memory we need to delete the readable
         * handler, otherwise it will get called recursively since
         * rdbLoad() will call the event loop to process events from time to
         * time for non blocking loading. */
        aeDeleteFileEvent(server.el,server.repl_transfer_s,AE_READABLE);
        if (rdbLoad(server.dbfilename) != REDIS_OK) {
            redisLog(REDIS_WARNING,"Failed trying to load the MASTER synchronization DB from disk");
            replicationAbortSyncTransfer();
            return;
        }
        /* Final setup of the connected slave <- master link */
        zfree(server.repl_transfer_tmpfile);
        close(server.repl_transfer_fd);
        server.master = createClient(server.repl_transfer_s);
        server.master->flags |= REDIS_MASTER;
        server.master->authenticated = 1;
        server.replstate = REDIS_REPL_CONNECTED;
        redisLog(REDIS_NOTICE, "MASTER <-> SLAVE sync: Finished with success");
    }
}
/* Asynchronously read the SYNC payload we receive from a master */
#define REPL_MAX_WRITTEN_BEFORE_FSYNC (1024*1024*8) /* 8 MB */
void readSyncBulkPayload(aeEventLoop *el, int fd, void *privdata, int mask) {
    char buf[4096];
    ssize_t nread, readlen;
    off_t left;
    REDIS_NOTUSED(el);
    REDIS_NOTUSED(privdata);
    REDIS_NOTUSED(mask);

    /* If repl_transfer_size == -1 we still have to read the bulk length
     * from the master reply. */
    if (server.repl_transfer_size == -1) {
        if (syncReadLine(fd,buf,1024,server.repl_syncio_timeout*1000) == -1) {
            redisLog(REDIS_WARNING,
                "I/O error reading bulk count from MASTER: %s",
                strerror(errno));
            goto error;
        }

        if (buf[0] == '-') {
            redisLog(REDIS_WARNING,
                "MASTER aborted replication with an error: %s",
                buf+1);
            goto error;
        } else if (buf[0] == '\0') {
            /* At this stage just a newline works as a PING in order to take
             * the connection live. So we refresh our last interaction
             * timestamp. */
            server.repl_transfer_lastio = server.unixtime;
            return;
        } else if (buf[0] != '$') {
            redisLog(REDIS_WARNING,"Bad protocol from MASTER, the first byte is not '$', are you sure the host and port are right?");
            goto error;
        }
        server.repl_transfer_size = strtol(buf+1,NULL,10);
        redisLog(REDIS_NOTICE,
            "MASTER <-> SLAVE sync: receiving %ld bytes from master",
            server.repl_transfer_size);
        return;
    }

    /* Read bulk data */
    left = server.repl_transfer_size - server.repl_transfer_read;
    readlen = (left < (signed)sizeof(buf)) ? left : (signed)sizeof(buf);
    nread = read(fd,buf,readlen);
    if (nread <= 0) {
        redisLog(REDIS_WARNING,"I/O error trying to sync with MASTER: %s",
            (nread == -1) ? strerror(errno) : "connection lost");
        replicationAbortSyncTransfer();
        return;
    }
    server.repl_transfer_lastio = server.unixtime;
    if (write(server.repl_transfer_fd,buf,nread) != nread) {
        redisLog(REDIS_WARNING,"Write error or short write writing to the DB dump file needed for MASTER <-> SLAVE synchronization: %s", strerror(errno));
        goto error;
    }
    server.repl_transfer_read += nread;

    /* Sync data on disk from time to time, otherwise at the end of the transfer
     * we may suffer a big delay as the memory buffers are copied into the
     * actual disk. */
    if (server.repl_transfer_read >=
        server.repl_transfer_last_fsync_off + REPL_MAX_WRITTEN_BEFORE_FSYNC)
    {
        off_t sync_size = server.repl_transfer_read -
                          server.repl_transfer_last_fsync_off;
        rdb_fsync_range(server.repl_transfer_fd,
            server.repl_transfer_last_fsync_off, sync_size);
        server.repl_transfer_last_fsync_off += sync_size;
    }

    /* Check if the transfer is now complete */
    if (server.repl_transfer_read == server.repl_transfer_size) {
        if (rename(server.repl_transfer_tmpfile,server.rdb_filename) == -1) {
            redisLog(REDIS_WARNING,"Failed trying to rename the temp DB into dump.rdb in MASTER <-> SLAVE synchronization: %s", strerror(errno));
            replicationAbortSyncTransfer();
            return;
        }
        redisLog(REDIS_NOTICE, "MASTER <-> SLAVE sync: Loading DB in memory");
        emptyDb();
        /* Before loading the DB into memory we need to delete the readable
         * handler, otherwise it will get called recursively since
         * rdbLoad() will call the event loop to process events from time to
         * time for non blocking loading. */
        aeDeleteFileEvent(server.el,server.repl_transfer_s,AE_READABLE);
        if (rdbLoad(server.rdb_filename) != REDIS_OK) {
            redisLog(REDIS_WARNING,"Failed trying to load the MASTER synchronization DB from disk");
            replicationAbortSyncTransfer();
            return;
        }
        /* Final setup of the connected slave <- master link */
        zfree(server.repl_transfer_tmpfile);
        close(server.repl_transfer_fd);
        server.master = createClient(server.repl_transfer_s);
        server.master->flags |= REDIS_MASTER;
        server.master->authenticated = 1;
        server.repl_state = REDIS_REPL_CONNECTED;
        redisLog(REDIS_NOTICE, "MASTER <-> SLAVE sync: Finished with success");
        /* Restart the AOF subsystem now that we finished the sync. This
         * will trigger an AOF rewrite, and when done will start appending
         * to the new file. */
        if (server.aof_state != REDIS_AOF_OFF) {
            int retry = 10;

            stopAppendOnly();
            while (retry-- && startAppendOnly() == REDIS_ERR) {
                redisLog(REDIS_WARNING,"Failed enabling the AOF after successful master synchrnization! Trying it again in one second.");
                sleep(1);
            }
            if (!retry) {
                redisLog(REDIS_WARNING,"FATAL: this slave instance finished the synchronization with its master, but the AOF can't be turned on. Exiting now.");
                exit(1);
            }
        }
    }

    return;

error:
    replicationAbortSyncTransfer();
    return;
}
Exemple #4
0
int syncWithMaster(void) {
    char buf[1024], tmpfile[256], authcmd[1024];
    long dumpsize;
    int fd = anetTcpConnect(NULL,server.masterhost,server.masterport);
    int dfd, maxtries = 5;

    if (fd == -1) {
        redisLog(REDIS_WARNING,"Unable to connect to MASTER: %s",
            strerror(errno));
        return REDIS_ERR;
    }

    /* AUTH with the master if required. */
    if(server.masterauth) {
    	snprintf(authcmd, 1024, "AUTH %s\r\n", server.masterauth);
    	if (syncWrite(fd, authcmd, strlen(server.masterauth)+7, 5) == -1) {
            close(fd);
            redisLog(REDIS_WARNING,"Unable to AUTH to MASTER: %s",
                strerror(errno));
            return REDIS_ERR;
    	}
        /* Read the AUTH result.  */
        if (syncReadLine(fd,buf,1024,3600) == -1) {
            close(fd);
            redisLog(REDIS_WARNING,"I/O error reading auth result from MASTER: %s",
                strerror(errno));
            return REDIS_ERR;
        }
        if (buf[0] != '+') {
            close(fd);
            redisLog(REDIS_WARNING,"Cannot AUTH to MASTER, is the masterauth password correct?");
            return REDIS_ERR;
        }
    }

    /* Issue the SYNC command */
    if (syncWrite(fd,"SYNC \r\n",7,5) == -1) {
        close(fd);
        redisLog(REDIS_WARNING,"I/O error writing to MASTER: %s",
            strerror(errno));
        return REDIS_ERR;
    }
    /* Read the bulk write count */
    if (syncReadLine(fd,buf,1024,3600) == -1) {
        close(fd);
        redisLog(REDIS_WARNING,"I/O error reading bulk count from MASTER: %s",
            strerror(errno));
        return REDIS_ERR;
    }
    if (buf[0] == '-') {
        close(fd);
        redisLog(REDIS_WARNING,"MASTER aborted replication with an error: %s",
            buf+1);
        return REDIS_ERR;
    } else if (buf[0] != '$') {
        close(fd);
        redisLog(REDIS_WARNING,"Bad protocol from MASTER, the first byte is not '$', are you sure the host and port are right?");
        return REDIS_ERR;
    }
    dumpsize = strtol(buf+1,NULL,10);
    redisLog(REDIS_NOTICE,"Receiving %ld bytes data dump from MASTER",dumpsize);
    /* Read the bulk write data on a temp file */
    while(maxtries--) {
        snprintf(tmpfile,256,
            "temp-%d.%ld.rdb",(int)time(NULL),(long int)getpid());
        dfd = open(tmpfile,O_CREAT|O_WRONLY|O_EXCL,0644);
        if (dfd != -1) break;
        sleep(1);
    }
    if (dfd == -1) {
        close(fd);
        redisLog(REDIS_WARNING,"Opening the temp file needed for MASTER <-> SLAVE synchronization: %s",strerror(errno));
        return REDIS_ERR;
    }
    while(dumpsize) {
        int nread, nwritten;

        nread = read(fd,buf,(dumpsize < 1024)?dumpsize:1024);
        if (nread <= 0) {
            redisLog(REDIS_WARNING,"I/O error trying to sync with MASTER: %s",
                (nread == -1) ? strerror(errno) : "connection lost");
            close(fd);
            close(dfd);
            return REDIS_ERR;
        }
        nwritten = write(dfd,buf,nread);
        if (nwritten == -1) {
            redisLog(REDIS_WARNING,"Write error writing to the DB dump file needed for MASTER <-> SLAVE synchrnonization: %s", strerror(errno));
            close(fd);
            close(dfd);
            return REDIS_ERR;
        }
        dumpsize -= nread;
    }
    close(dfd);
    if (rename(tmpfile,server.dbfilename) == -1) {
        redisLog(REDIS_WARNING,"Failed trying to rename the temp DB into dump.rdb in MASTER <-> SLAVE synchronization: %s", strerror(errno));
        unlink(tmpfile);
        close(fd);
        return REDIS_ERR;
    }
    emptyDb();
    if (rdbLoad(server.dbfilename) != REDIS_OK) {
        redisLog(REDIS_WARNING,"Failed trying to load the MASTER synchronization DB from disk");
        close(fd);
        return REDIS_ERR;
    }
    server.master = createClient(fd);
    server.master->flags |= REDIS_MASTER;
    server.master->authenticated = 1;
    server.replstate = REDIS_REPL_CONNECTED;
    return REDIS_OK;
}