git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/behavior.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2006-2009 Brian Aker All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37
  38 #include <libmemcached/common.h>
  39 #include <libmemcached/options.hpp>
  40 #include <libmemcached/virtual_bucket.h>
  41
  42 #include <ctime>
  43 #include <sys/types.h>
  44
  45 /*
  46   This function is used to modify the behavior of running client.
  47
  48   We quit all connections so we can reset the sockets.
  49 */
  50
  51 memcached_return_t memcached_behavior_set(memcached_st *ptr,
  52                                           const memcached_behavior_t flag,
  53                                           uint64_t data)
  54 {
  55   if (ptr == NULL)
  56   {
  57     return MEMCACHED_INVALID_ARGUMENTS;
  58   }
  59
  60   switch (flag)
  61   {
  62   case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS:
  63     ptr->number_of_replicas= (uint32_t)data;
  64     break;
  65
  66   case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK:
  67     ptr->io_msg_watermark= (uint32_t) data;
  68     break;
  69
  70   case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK:
  71     ptr->io_bytes_watermark= (uint32_t)data;
  72     break;
  73
  74   case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH:
  75     ptr->io_key_prefetch = (uint32_t)data;
  76     break;
  77
  78   case MEMCACHED_BEHAVIOR_SND_TIMEOUT:
  79     ptr->snd_timeout= (int32_t)data;
  80     break;
  81
  82   case MEMCACHED_BEHAVIOR_RCV_TIMEOUT:
  83     ptr->rcv_timeout= (int32_t)data;
  84     break;
  85
  86   case MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS:
  87     ptr->flags.auto_eject_hosts= bool(data);
  88
  89   case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT:
  90     if (data == 0)
  91     {
  92       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
  93                                         memcached_literal_param("MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT requires a value greater then zero."));
  94     }
  95     ptr->server_failure_limit= uint32_t(data);
  96     break;
  97
  98   case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL:
  99     send_quit(ptr); // We need t shutdown all of the connections to make sure we do the correct protocol
 100     if (data)
 101     {
 102       ptr->flags.verify_key= false;
 103     }
 104     ptr->flags.binary_protocol= bool(data);
 105     break;
 106
 107   case MEMCACHED_BEHAVIOR_SUPPORT_CAS:
 108     ptr->flags.support_cas= bool(data);
 109     break;
 110
 111   case MEMCACHED_BEHAVIOR_NO_BLOCK:
 112     ptr->flags.no_block= bool(data);
 113     send_quit(ptr);
 114     break;
 115
 116   case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS:
 117     if (memcached_is_udp(ptr))
 118     {
 119       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 120                                  memcached_literal_param("MEMCACHED_BEHAVIOR_BUFFER_REQUESTS cannot be set while MEMCACHED_BEHAVIOR_USE_UDP is enabled."));
 121     }
 122     ptr->flags.buffer_requests= bool(data);
 123     send_quit(ptr);
 124     break;
 125
 126   case MEMCACHED_BEHAVIOR_USE_UDP:
 127     send_quit(ptr); // We need t shutdown all of the connections to make sure we do the correct protocol
 128     ptr->flags.use_udp= bool(data);
 129     if (bool(data))
 130     {
 131       ptr->flags.reply= false;
 132       ptr->flags.buffer_requests= false;
 133     }
 134     else
 135     {
 136       ptr->flags.reply= true;
 137     }
 138     break;
 139
 140   case MEMCACHED_BEHAVIOR_TCP_NODELAY:
 141     ptr->flags.tcp_nodelay= bool(data);
 142     send_quit(ptr);
 143     break;
 144
 145   case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE:
 146     ptr->flags.tcp_keepalive= bool(data);
 147     send_quit(ptr);
 148     break;
 149
 150   case MEMCACHED_BEHAVIOR_DISTRIBUTION:
 151     return memcached_behavior_set_distribution(ptr, (memcached_server_distribution_t)data);
 152
 153   case MEMCACHED_BEHAVIOR_KETAMA:
 154     {
 155       if (data) // Turn on
 156       {
 157         return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA);
 158       }
 159
 160       return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_MODULA);
 161     }
 162
 163   case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED:
 164     {
 165       (void)memcached_behavior_set_key_hash(ptr, MEMCACHED_HASH_MD5);
 166       (void)memcached_behavior_set_distribution_hash(ptr, MEMCACHED_HASH_MD5);
 167       ptr->ketama.weighted= bool(data);
 168       /**
 169         @note We try to keep the same distribution going. This should be deprecated and rewritten.
 170       */
 171       return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA);
 172     }
 173
 174   case MEMCACHED_BEHAVIOR_HASH:
 175     return memcached_behavior_set_key_hash(ptr, (memcached_hash_t)(data));
 176
 177   case MEMCACHED_BEHAVIOR_KETAMA_HASH:
 178     return memcached_behavior_set_distribution_hash(ptr, (memcached_hash_t)(data));
 179
 180   case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS:
 181     return memcached_set_error(*ptr, MEMCACHED_DEPRECATED, MEMCACHED_AT,
 182                                       memcached_literal_param("MEMCACHED_BEHAVIOR_CACHE_LOOKUPS has been deprecated."));
 183
 184   case MEMCACHED_BEHAVIOR_VERIFY_KEY:
 185     if (ptr->flags.binary_protocol)
 186     {
 187       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 188                                         memcached_literal_param("MEMCACHED_BEHAVIOR_VERIFY_KEY if the binary protocol has been enabled."));
 189     }
 190     ptr->flags.verify_key= bool(data);
 191     break;
 192
 193   case MEMCACHED_BEHAVIOR_SORT_HOSTS:
 194     {
 195       ptr->flags.use_sort_hosts= bool(data);
 196       return run_distribution(ptr);
 197     }
 198
 199   case MEMCACHED_BEHAVIOR_POLL_TIMEOUT:
 200     ptr->poll_timeout= (int32_t)data;
 201     break;
 202
 203   case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT:
 204     ptr->connect_timeout= (int32_t)data;
 205     break;
 206
 207   case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT:
 208     if (data == 0)
 209     {
 210       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 211                                         memcached_literal_param("MEMCACHED_BEHAVIOR_RETRY_TIMEOUT requires a value greater then zero."));
 212     }
 213     ptr->retry_timeout= int32_t(data);
 214     break;
 215
 216   case MEMCACHED_BEHAVIOR_DEAD_TIMEOUT:
 217     ptr->dead_timeout= int32_t(data);
 218     break;
 219
 220   case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE:
 221     ptr->send_size= (int32_t)data;
 222     send_quit(ptr);
 223     break;
 224
 225   case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE:
 226     ptr->recv_size= (int32_t)data;
 227     send_quit(ptr);
 228     break;
 229
 230   case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE:
 231     ptr->tcp_keepidle= (uint32_t)data;
 232     send_quit(ptr);
 233     break;
 234
 235   case MEMCACHED_BEHAVIOR_USER_DATA:
 236     return memcached_set_error(*ptr, MEMCACHED_DEPRECATED, MEMCACHED_AT,
 237                                memcached_literal_param("MEMCACHED_BEHAVIOR_USER_DATA deprecated."));
 238
 239   case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY:
 240     ptr->flags.hash_with_namespace= bool(data);
 241     break;
 242
 243   case MEMCACHED_BEHAVIOR_NOREPLY:
 244     if (memcached_is_udp(ptr) and bool(data) == false)
 245     {
 246       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 247                                  memcached_literal_param("MEMCACHED_BEHAVIOR_NOREPLY cannot be disabled while MEMCACHED_BEHAVIOR_USE_UDP is enabled."));
 248     }
 249     // We reverse the logic here to make it easier to understand throughout the
 250     // code.
 251     ptr->flags.reply= bool(data) ? false : true;
 252     break;
 253
 254   case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS:
 255     ptr->flags.auto_eject_hosts= bool(data);
 256     break;
 257
 258   case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ:
 259       srandom((uint32_t) time(NULL));
 260       ptr->flags.randomize_replica_read= bool(data);
 261       break;
 262
 263   case MEMCACHED_BEHAVIOR_CORK:
 264       return memcached_set_error(*ptr, MEMCACHED_DEPRECATED, MEMCACHED_AT,
 265                                  memcached_literal_param("MEMCACHED_BEHAVIOR_CORK is now incorporated into the driver by default."));
 266
 267   case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE:
 268       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 269                                  memcached_literal_param("MEMCACHED_BEHAVIOR_LOAD_FROM_FILE can not be set with memcached_behavior_set()"));
 270
 271   case MEMCACHED_BEHAVIOR_MAX:
 272   default:
 273       /* Shouldn't get here */
 274       assert_msg(0, "Invalid behavior passed to memcached_behavior_set()");
 275       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 276                                  memcached_literal_param("Invalid behavior passed to memcached_behavior_set()"));
 277   }
 278
 279   return MEMCACHED_SUCCESS;
 280 }
 281
 282 bool _is_auto_eject_host(const memcached_st *ptr)
 283 {
 284   return ptr->flags.auto_eject_hosts;
 285 }
 286
 287 uint64_t memcached_behavior_get(memcached_st *ptr,
 288                                 const memcached_behavior_t flag)
 289 {
 290   if (ptr == NULL)
 291   {
 292     return MEMCACHED_INVALID_ARGUMENTS;
 293   }
 294
 295   switch (flag)
 296   {
 297   case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS:
 298     return ptr->number_of_replicas;
 299
 300   case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK:
 301     return ptr->io_msg_watermark;
 302
 303   case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK:
 304     return ptr->io_bytes_watermark;
 305
 306   case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH:
 307     return ptr->io_key_prefetch;
 308
 309   case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL:
 310     return ptr->flags.binary_protocol;
 311
 312   case MEMCACHED_BEHAVIOR_SUPPORT_CAS:
 313     return ptr->flags.support_cas;
 314
 315   case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS:
 316     return true;
 317
 318   case MEMCACHED_BEHAVIOR_NO_BLOCK:
 319     return ptr->flags.no_block;
 320
 321   case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS:
 322     return ptr->flags.buffer_requests;
 323
 324   case MEMCACHED_BEHAVIOR_USE_UDP:
 325     return memcached_is_udp(ptr);
 326
 327   case MEMCACHED_BEHAVIOR_TCP_NODELAY:
 328     return ptr->flags.tcp_nodelay;
 329
 330   case MEMCACHED_BEHAVIOR_VERIFY_KEY:
 331     return ptr->flags.verify_key;
 332
 333   case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED:
 334     return ptr->ketama.weighted;
 335
 336   case MEMCACHED_BEHAVIOR_DISTRIBUTION:
 337     return ptr->distribution;
 338
 339   case MEMCACHED_BEHAVIOR_KETAMA:
 340     return (ptr->distribution == MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA) ? (uint64_t) 1 : 0;
 341
 342   case MEMCACHED_BEHAVIOR_HASH:
 343     return hashkit_get_function(&ptr->hashkit);
 344
 345   case MEMCACHED_BEHAVIOR_KETAMA_HASH:
 346     return hashkit_get_function(&ptr->hashkit);
 347
 348   case MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS:
 349   case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT:
 350     return ptr->server_failure_limit;
 351
 352   case MEMCACHED_BEHAVIOR_SORT_HOSTS:
 353     return ptr->flags.use_sort_hosts;
 354
 355   case MEMCACHED_BEHAVIOR_POLL_TIMEOUT:
 356     return (uint64_t)ptr->poll_timeout;
 357
 358   case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT:
 359     return (uint64_t)ptr->connect_timeout;
 360
 361   case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT:
 362     return (uint64_t)ptr->retry_timeout;
 363
 364   case MEMCACHED_BEHAVIOR_DEAD_TIMEOUT:
 365     return uint64_t(ptr->dead_timeout);
 366
 367   case MEMCACHED_BEHAVIOR_SND_TIMEOUT:
 368     return (uint64_t)ptr->snd_timeout;
 369
 370   case MEMCACHED_BEHAVIOR_RCV_TIMEOUT:
 371     return (uint64_t)ptr->rcv_timeout;
 372
 373   case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE:
 374     return (uint64_t)ptr->tcp_keepidle;
 375
 376   case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE:
 377     {
 378       int sock_size= 0;
 379       socklen_t sock_length= sizeof(int);
 380
 381       if (ptr->send_size != -1) // If value is -1 then we are using the default
 382       {
 383         return (uint64_t) ptr->send_size;
 384       }
 385
 386       memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, 0);
 387
 388       if (instance) // If we have an instance we test, otherwise we just set and pray
 389       {
 390         /* REFACTOR */
 391         /* We just try the first host, and if it is down we return zero */
 392         if (memcached_failed(memcached_connect(instance)))
 393         {
 394           return 0;
 395         }
 396
 397         if (memcached_failed(memcached_io_wait_for_write(instance)))
 398         {
 399           return 0;
 400         }
 401
 402         if (getsockopt(instance->fd, SOL_SOCKET, SO_SNDBUF, &sock_size, &sock_length) < 0)
 403         {
 404           memcached_set_errno(*ptr, get_socket_errno(), MEMCACHED_AT);
 405           return 0; /* Zero means error */
 406         }
 407       }
 408
 409       return (uint64_t) sock_size;
 410     }
 411
 412   case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE:
 413     {
 414       int sock_size= 0;
 415       socklen_t sock_length= sizeof(int);
 416
 417       if (ptr->recv_size != -1) // If value is -1 then we are using the default
 418         return (uint64_t) ptr->recv_size;
 419
 420       memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, 0);
 421
 422       /**
 423         @note REFACTOR
 424       */
 425       if (instance)
 426       {
 427         /* We just try the first host, and if it is down we return zero */
 428         if (memcached_failed(memcached_connect(instance)))
 429         {
 430           return 0;
 431         }
 432
 433         if (memcached_failed(memcached_io_wait_for_write(instance)))
 434         {
 435           return 0;
 436         }
 437
 438         if (getsockopt(instance->fd, SOL_SOCKET, SO_RCVBUF, &sock_size, &sock_length) < 0)
 439         {
 440           memcached_set_errno(*ptr, get_socket_errno(), MEMCACHED_AT);
 441           return 0; /* Zero means error */
 442         }
 443       }
 444
 445       return (uint64_t) sock_size;
 446     }
 447
 448   case MEMCACHED_BEHAVIOR_USER_DATA:
 449     memcached_set_error(*ptr, MEMCACHED_DEPRECATED, MEMCACHED_AT,
 450                         memcached_literal_param("MEMCACHED_BEHAVIOR_USER_DATA deprecated."));
 451     return 0;
 452
 453   case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY:
 454     return ptr->flags.hash_with_namespace;
 455
 456   case MEMCACHED_BEHAVIOR_NOREPLY:
 457     return ptr->flags.reply ? false : true;
 458
 459   case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS:
 460     return ptr->flags.auto_eject_hosts;
 461
 462   case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ:
 463     return ptr->flags.randomize_replica_read;
 464
 465   case MEMCACHED_BEHAVIOR_CORK:
 466 #ifdef HAVE_MSG_MORE
 467     return true;
 468 #else
 469     return false;
 470 #endif
 471
 472   case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE:
 473     return ptr->flags.tcp_keepalive;
 474
 475   case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE:
 476     return bool(memcached_parse_filename(ptr));
 477
 478   case MEMCACHED_BEHAVIOR_MAX:
 479   default:
 480     assert_msg(0, "Invalid behavior passed to memcached_behavior_set()");
 481     return 0;
 482   }
 483
 484   /* NOTREACHED */
 485 }
 486
 487
 488 memcached_return_t memcached_behavior_set_distribution(memcached_st *ptr, memcached_server_distribution_t type)
 489 {
 490   if (type < MEMCACHED_DISTRIBUTION_CONSISTENT_MAX)
 491   {
 492     if (MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED)
 493     {
 494       ptr->ketama.weighted= true;
 495     }
 496     else
 497     {
 498       ptr->ketama.weighted= false;
 499     }
 500
 501     ptr->distribution= type;
 502     return run_distribution(ptr);
 503   }
 504
 505   return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 506                              memcached_literal_param("Invalid memcached_server_distribution_t"));
 507 }
 508
 509
 510 memcached_server_distribution_t memcached_behavior_get_distribution(memcached_st *ptr)
 511 {
 512   return ptr->distribution;
 513 }
 514
 515 memcached_return_t memcached_behavior_set_key_hash(memcached_st *ptr, memcached_hash_t type)
 516 {
 517   if (hashkit_success(hashkit_set_function(&ptr->hashkit, (hashkit_hash_algorithm_t)type)))
 518   {
 519     return MEMCACHED_SUCCESS;
 520   }
 521
 522   return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 523                              memcached_literal_param("Invalid memcached_hash_t()"));
 524 }
 525
 526 memcached_hash_t memcached_behavior_get_key_hash(memcached_st *ptr)
 527 {
 528   return (memcached_hash_t)hashkit_get_function(&ptr->hashkit);
 529 }
 530
 531 memcached_return_t memcached_behavior_set_distribution_hash(memcached_st *ptr, memcached_hash_t type)
 532 {
 533   if (hashkit_success(hashkit_set_distribution_function(&ptr->hashkit, (hashkit_hash_algorithm_t)type)))
 534     return MEMCACHED_SUCCESS;
 535
 536   return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 537                              memcached_literal_param("Invalid memcached_hash_t()"));
 538 }
 539
 540 memcached_hash_t memcached_behavior_get_distribution_hash(memcached_st *ptr)
 541 {
 542   return (memcached_hash_t)hashkit_get_function(&ptr->hashkit);
 543 }
 544
 545 const char *libmemcached_string_behavior(const memcached_behavior_t flag)
 546 {
 547   switch (flag)
 548   {
 549   case MEMCACHED_BEHAVIOR_NO_BLOCK: return "MEMCACHED_BEHAVIOR_NO_BLOCK";
 550   case MEMCACHED_BEHAVIOR_TCP_NODELAY: return "MEMCACHED_BEHAVIOR_TCP_NODELAY";
 551   case MEMCACHED_BEHAVIOR_HASH: return "MEMCACHED_BEHAVIOR_HASH";
 552   case MEMCACHED_BEHAVIOR_KETAMA: return "MEMCACHED_BEHAVIOR_KETAMA";
 553   case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE: return "MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE";
 554   case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE: return "MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE";
 555   case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS: return "MEMCACHED_BEHAVIOR_CACHE_LOOKUPS";
 556   case MEMCACHED_BEHAVIOR_SUPPORT_CAS: return "MEMCACHED_BEHAVIOR_SUPPORT_CAS";
 557   case MEMCACHED_BEHAVIOR_POLL_TIMEOUT: return "MEMCACHED_BEHAVIOR_POLL_TIMEOUT";
 558   case MEMCACHED_BEHAVIOR_DISTRIBUTION: return "MEMCACHED_BEHAVIOR_DISTRIBUTION";
 559   case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS: return "MEMCACHED_BEHAVIOR_BUFFER_REQUESTS";
 560   case MEMCACHED_BEHAVIOR_USER_DATA: return "MEMCACHED_BEHAVIOR_USER_DATA";
 561   case MEMCACHED_BEHAVIOR_SORT_HOSTS: return "MEMCACHED_BEHAVIOR_SORT_HOSTS";
 562   case MEMCACHED_BEHAVIOR_VERIFY_KEY: return "MEMCACHED_BEHAVIOR_VERIFY_KEY";
 563   case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT: return "MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT";
 564   case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT: return "MEMCACHED_BEHAVIOR_RETRY_TIMEOUT";
 565   case MEMCACHED_BEHAVIOR_DEAD_TIMEOUT: return "MEMCACHED_BEHAVIOR_DEAD_TIMEOUT";
 566   case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED: return "MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED";
 567   case MEMCACHED_BEHAVIOR_KETAMA_HASH: return "MEMCACHED_BEHAVIOR_KETAMA_HASH";
 568   case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL: return "MEMCACHED_BEHAVIOR_BINARY_PROTOCOL";
 569   case MEMCACHED_BEHAVIOR_SND_TIMEOUT: return "MEMCACHED_BEHAVIOR_SND_TIMEOUT";
 570   case MEMCACHED_BEHAVIOR_RCV_TIMEOUT: return "MEMCACHED_BEHAVIOR_RCV_TIMEOUT";
 571   case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT: return "MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT";
 572   case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK: return "MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK";
 573   case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK: return "MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK";
 574   case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH: return "MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH";
 575   case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY: return "MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY";
 576   case MEMCACHED_BEHAVIOR_NOREPLY: return "MEMCACHED_BEHAVIOR_NOREPLY";
 577   case MEMCACHED_BEHAVIOR_USE_UDP: return "MEMCACHED_BEHAVIOR_USE_UDP";
 578   case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS: return "MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS";
 579   case MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS: return "MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS";
 580   case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS: return "MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS";
 581   case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ: return "MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ";
 582   case MEMCACHED_BEHAVIOR_CORK: return "MEMCACHED_BEHAVIOR_CORK";
 583   case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE: return "MEMCACHED_BEHAVIOR_TCP_KEEPALIVE";
 584   case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE: return "MEMCACHED_BEHAVIOR_TCP_KEEPIDLE";
 585   case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE: return "MEMCACHED_BEHAVIOR_LOAD_FROM_FILE";
 586   default:
 587   case MEMCACHED_BEHAVIOR_MAX: return "INVALID memcached_behavior_t";
 588   }
 589 }
 590
 591 const char *libmemcached_string_distribution(const memcached_server_distribution_t flag)
 592 {
 593   switch (flag)
 594   {
 595   case MEMCACHED_DISTRIBUTION_MODULA: return "MEMCACHED_DISTRIBUTION_MODULA";
 596   case MEMCACHED_DISTRIBUTION_CONSISTENT: return "MEMCACHED_DISTRIBUTION_CONSISTENT";
 597   case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA: return "MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA";
 598   case MEMCACHED_DISTRIBUTION_RANDOM: return "MEMCACHED_DISTRIBUTION_RANDOM";
 599   case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY: return "MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY";
 600   case MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED: return "MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED";
 601   case MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET: return "MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET";
 602   default:
 603   case MEMCACHED_DISTRIBUTION_CONSISTENT_MAX: return "INVALID memcached_server_distribution_t";
 604   }
 605 }
 606
 607 memcached_return_t memcached_bucket_set(memcached_st *self,
 608                                         const uint32_t *host_map,
 609                                         const uint32_t *forward_map,
 610                                         const uint32_t buckets,
 611                                         const uint32_t replicas)
 612 {
 613   memcached_return_t rc;
 614
 615   if (self == NULL)
 616   {
 617     return MEMCACHED_INVALID_ARGUMENTS;
 618   }
 619
 620   if (host_map == NULL)
 621   {
 622     return MEMCACHED_INVALID_ARGUMENTS;
 623   }
 624
 625   memcached_server_distribution_t old= memcached_behavior_get_distribution(self);
 626
 627   if (memcached_failed(rc =memcached_behavior_set_distribution(self, MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET)))
 628   {
 629     return rc;
 630   }
 631
 632   if (memcached_failed(rc= memcached_virtual_bucket_create(self, host_map, forward_map, buckets, replicas)))
 633   {
 634     memcached_behavior_set_distribution(self, old);
 635   }
 636
 637   return rc;
 638 }