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I am using libmemcached C API for interacting with memcached. Occasionally memcached_set fails with SERVER HAS FAILED AND DISABLED UNTIL TIMED RETRY. What can be a general approach to handle this issue.

This error only occurs on production servers, and it is not producible in development environment.

  • memcached version : 1.4.7
  • libmemcahced version: 1.0.2
  • Linux RHEL6 OS
  • GCC 4.7.3

Following is the pseudo code snippet, cannot post entire code.

bool set_keys(std::string const & query)
{
  // create a DB connection
  // execute query
  // consider result of query is as following
  std::vector<std::tuple<std::string,std::string>>result_set;
  memcached_return rc;
  for(auto const & item :  result_set )
  {
      rc= memcached_set(memc, std::get<0>(item).c_str(), std::get<0>(item).size(),  std::get<1>(item).c_str(),  std::get<1>(item).size(), (time_t)0, (uint32_t)0);

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

One thing I noticed that memcached_server_list_append is not used anywhere in code after creations of memcached connection, can this cause issues?

g-217
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  • Please add a comment when you down-vote, will be a learning for me... Because I have no idea.. what was wrong with the question – g-217 Feb 17 '16 at 12:46

1 Answers1

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Possible the server is overloaded. Check the loading of memcached by top.

Check the key names when set for valid values.

Try to set Memcached::OPT_BINARY_PROTOCOL, to enable binary data.

oklas
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