Function sentinelFlushConfig

src/sentinel.cpp:2319–2337

This function uses the config rewriting Redis engine in order to persist * the state of the Sentinel in the current configuration file. * * Before returning the function calls fsync() against the generated * configuration file to make sure changes are committed to disk. * * On failure the function logs a warning on the Redis log. */

 *
 * On failure the function logs a warning on the Redis log. */
void sentinelFlushConfig(void) {
    int fd = -1;
    int saved_hz = g_pserver->hz;
    int rewrite_status;

    g_pserver->hz = CONFIG_DEFAULT_HZ;
    rewrite_status = rewriteConfig(cserver.configfile, 0);
    g_pserver->hz = saved_hz;

    if (rewrite_status == -1) goto werr;
    if ((fd = open(cserver.configfile,O_RDONLY)) == -1) goto werr;
    if (fsync(fd) == -1) goto werr;
    if (close(fd) == EOF) goto werr;
    return;

werr:
    serverLog(LL_WARNING,"WARNING: Sentinel was not able to save the new configuration on disk!!!: %s", strerror(errno));
    if (fd != -1) close(fd);
}

/* ====================== hiredis connection handling ======================= */