synchronous example redisClusterConnect2 doesn't work with Redis 5.0.3

[arzaidi]

cc = redisClusterContextInit();
redisClusterSetOptionAddNodes(cc, "127.0.0.1:9001, 127.0.0.1:9002, 127.0.0.1:9003, 127.0.0.1:9004, 127.0.0.1:9005, 127.0.0.1:9006");
redisClusterConnect2(cc);
if(cc == NULL || cc->err)
{
    printf("connect error : %s\n", cc == NULL ? "NULL" : cc->errstr);
    return -1;
}
redisReply *reply = reinterpret_cast<redisReply*> (redisClusterCommand(cc, "hmget %s %s", key, field));

Results in Error:
reply is null[ctx get by node is null]

But if I replace the first three lines with following, then it works fine:

cc = redisClusterConnect("127.0.0.1:9001,127.0.0.1:9002,127.0.0.1:9003,127.0.0.1:9004,127.0.0.1:9005,127.0.0.1:9006",HIRCLUSTER_FLAG_ROUTE_USE_SLOTS);

[thakurajayL]

I think this client does not support 4.x & 5.x. Since there is basic change in the the way initial negotiation happens with 4.0/5.0 clusters. Can you check wireshark and confirm

[david-freistrom]

Setup your context to use slots before connect

redisClusterSetOptionRouteUseSlots(cc);

[Drakeeagle]

When I use asyn cluster connect api , I have the same issue. following code failed

const char * paddrs = "ip_0:port_0,ip_1:port_1";
redisClusterAsyncConnect(paddrs, HIRCLUSTER_FLAG_NULL);

Setup your context to use slots before connect

redisClusterSetOptionRouteUseSlots(cc);

if you want to use asyn cluster api, you can add redisClusterSetOptionRouteUseSlots(cc) in the below function

//hircluster.c

static redisClusterContext *_redisClusterConnect(redisClusterContext *cc, const char *addrs) {
  ret = redisClusterSetOptionAddNodes(cc, addrs);
  ...
  redisClusterSetOptionRouteUseSlots(cc);
  cluster_update_route(cc);
}