memcached client: connection failure

[black...@gmail.com]

Hello all,

I'm trying to use hazelcast (3.6.3) together with libmemcached (1.0.18). I try a simple set command and always get an CONNECTION FAILURE. Is the memcached support broken? I also tried the python-memcached module with the same result. Connecting with a real memcached daemon works fine.

Here is my source code (compile with gcc test.c -l memcached):

#include <libmemcached/memcached.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

int main(int argc, char **argv) {

  memcached_server_st *servers = NULL;

  memcached_st *memc;

  memcached_return rc;

  char *key = "keystring";

  char *value = "keyvalue";

  size_t value_length;

  uint32_t flags;

  memc = memcached_create(NULL);

  servers = memcached_server_list_append(servers, "localhost", 5701, &rc);

  rc = memcached_server_push(memc, servers);

  if (rc == MEMCACHED_SUCCESS)

    fprintf(stderr, "Added server successfully\n");

  else

    fprintf(stderr, "Couldn't add server: %s\n", memcached_strerror(memc, rc));

  rc = memcached_set(memc, key, strlen(key), value, strlen(value), (time_t)0, (uint32_t)3600);

  if (rc == MEMCACHED_SUCCESS)

    fprintf(stderr, "Key stored successfully\n");

  else

    fprintf(stderr, "Couldn't store key: %s\n", memcached_strerror(memc, rc));

  return 0;

}

The output of the client:

Added server successfully

Couldn't store key: CONNECTION FAILURE

The server output:

Jul 16, 2016 11:12:59 AM com.hazelcast.nio.tcp.SocketAcceptorThread

INFO: [172.16.243.141]:5701 [dev] [3.6.3] Accepting socket connection from /127.0.0.1:36681

Jul 16, 2016 11:12:59 AM com.hazelcast.nio.tcp.TcpIpConnectionManager

INFO: [172.16.243.141]:5701 [dev] [3.6.3] Established socket connection between /127.0.0.1:5701 and /127.0.0.1:36681

Jul 16, 2016 11:12:59 AM com.hazelcast.nio.tcp.TcpIpConnection

INFO: [172.16.243.141]:5701 [dev] [3.6.3] Connection [/127.0.0.1:36681] lost. Reason: Socket explicitly closed

Both the client and the server are running on the same host. Can anybody explain what's happening?  Is hazelcast's memcached support broken?

Thanks,

Tom.

[Emrah Kocaman]

Hi Tom,

Memcache client support is disabled by default. Have you set "hazelcast.memcache.enabled" system property to "true" on your Hazelcast servers?

Best,

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[black...@gmail.com]

Hello all,

I'm trying to use hazelcast (3.6.3) together with libmemcached (1.0.18). I try a simple set command and always get an CONNECTION FAILURE. I also tried the python-memcached module with the same result. Connecting with a real memcached daemon works fine.

[Noctarius]

Hey Tom,

Did you explicitly activate memcached protocol? This was deactivated with Hazelcast 3.6 by default for security reasons. To activate it please see: http://docs.hazelcast.org/docs/3.6/manual/html-single/index.html#memcache-client. More specifically the last paragraph of the chapter, talking about “hazelcast.memcache.enabled”.

Chris

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[black...@gmail.com]

Thanks a lot guys! This solved my issue.

Best regards

Tom