Turning Caches into Distributed Systems with mcrouter - Data@Scale
Ryan McElroy, software engineer at Facebook, introduces "mcrouter," software that the company has developed for turning standalone caches into a robust distributed system.
Memcache ã®Slab Reassign, Slab Automoveã«ã¤ã„ã¦
Memcache1.4.5を使用ã—ã¦ã„ã‚‹ã®ã ãŒã€ã‚¢ãƒ—リケーションã«ã¨ã£ã¦ä¸éƒ½åˆãªç‚¹ãŒã§ã¦ã„る・・・ 具体的ã«è¨€ã†ã¨ã€ãƒ¡ãƒ¢ãƒªã¯ä½™è£•ãŒã‚ã‚‹ã®ã«ã€EvictionãŒç™ºç”Ÿã—ã¦ã—ã¾ã£ã¦ã„ã‚‹ã®ã 。 検索ã—ãŸã¨ã“ã‚ã€ã¡ã‚‡ã„ã¨è¨˜äº‹ãŒå¤ã„ãŒMemcachedã®ãƒ¡ãƒ¢ãƒªä½¿ç”¨æ–¹æ³•ã«ã¤ã„ã¦è©³ã—ã„ã‚‚ã®ã‚’見ã¤ã‘ãŸã€‚ memcachedを知り尽ãã™ memcachedã¨Redisã®ç”Ÿå˜æˆ¦ç•¥ã€ã¨ã„ã†ã‹memory allocation戦略 ã¼ãらã®LRU ã“れらを見るã¨ä¸€åº¦ç¢ºä¿ã•ã‚ŒãŸãƒãƒ£ãƒ³ã‚¯ã®ãƒšãƒ¼ã‚¸ã¯ã€ä»–ã®ãƒãƒ£ãƒ³ã‚¯ã«å‰²ã‚ŠæŒ¯ã‚‰ã‚Œã‚‹ã“ã¨ãŒãªã„ã®ã§ã€æœ€åˆã«å®¹é‡ã‚’確ä¿ã•ã‚Œã¦ã—ã¾ã£ãŸã‚‰ã€é–‹æ”¾ã•ã‚Œã‚‹ã“ã¨ãŒãªã„模様。 ã—ã‹ã—〠version 1.4.11ã‹ã‚‰ã¯ã€ŒSlab Reassignã€ã€ã€ŒSlab Automoveã€ã¨è¨€ã†ã€ä½¿ã£ã¦ã„ãªã„ãƒãƒ£ãƒ³ã‚¯ã®ãƒšãƒ¼ã‚¸ã‚’ã€é »ç¹ã«ä½¿ã£ã¦ã„ã‚‹ãƒãƒ£ãƒ³ã‚¯ã«å‰²ã‚ŠæŒ¯ã‚Šç›´ã™æ©Ÿèƒ½ãŒã‚るよã†ãªã®ã§ã€å…¬å¼ãƒšãƒ¼ã‚¸ã‚’見ã¦
Memcache 'stats' reports non-zero 'curr_connections' - but lsof shows no socket connections
I think you're correct in your logic that stat curr_connections is the number of connections that are current. curr_connections - Number of open connections to this Memcached server, should be the same value on all servers during normal operation. This is something like the count of mySQL's "SHOW PROCESSLIST" result rows. Source: Memcached statistics (stats command) When I setup memcached I notice
Moxi - Memcached Proxy
Moxi is a memcached proxy that allows clients like PHP applications to connect to it instead of directly to memcached servers. It handles protocol conversion, failure handling, consistent hashing of keys, and GET deduplication to improve performance. Moxi can also act as a front cache and support configurable features like timeouts, blackhole mode, and fire-and-forget SET operations.Read less
memcachedã®stats slabsを解æžã™ã‚‹Rubyスクリプト
memcachedã®stats slabsã®é …ç›®åã¯ç›´æ„Ÿçš„ã§ãªã„。 例ãˆã°ã€ free_chunksã¯ã€deleteç‰ã•ã‚Œã¦å†åˆ©ç”¨å¯èƒ½ãªãƒãƒ£ãƒ³ã‚¯æ•° free_chunks_endãŒæœ€å¾Œã«ã‚¢ãƒã‚±ãƒ¼ãƒˆã•ã‚ŒãŸãƒšãƒ¼ã‚¸ã§ä¸€åº¦ã‚‚setã•ã‚Œã¦ã„ãªã„ãƒãƒ£ãƒ³ã‚¯æ•° ã¨ã‹ã¯ã€memcachedã®ã‚½ãƒ¼ã‚¹ã‚’èªã‚“ã§ã‚„ã£ã¨æ„味ãŒã‚ã‹ã£ãŸã€‚ ã¾ãŸã€ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã®éš›ã«å¿…è¦ãªã€ã‚¢ãƒ©ã‚¤ãƒ³ãƒ¡ãƒ³ãƒˆã«ã‚ˆã‚‹ç„¡é§„é ˜åŸŸã®åˆè¨ˆãŒã±ã£ã¨è¦‹ã§ã‚ã‹ã‚‰ãªã‹ã£ãŸã‚Šã™ã‚‹ã€‚ ã¨ã†ã„ã“ã¨ã§ã€ memcachedã®stats slabsçµ±è¨ˆæƒ…å ±ã‚’è§£æžã™ã‚‹Rubyスクリプトを張り付ã‘ã¦ãŠã。 # テã‚ストプãƒãƒˆã‚³ãƒ«ã«ã—ã‹å¯¾å¿œã—ã¦ã¾ã›ã‚“。 # ãƒã‚¤ãƒŠãƒªãƒ—ãƒãƒˆã‚³ãƒ«å°‚用ã®memachedã¸ã¯ã€rubyã®memcachedライブラリを使ã†ã‚ˆã†ã«æ”¹é€ ã™ã‚Šã‚ƒã§ãる。 起動オプションUsage: ./better_stats_slabs.rb -d /path_to_dir
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Scaling Memcache at Facebook
ReleaseNotes1425
Google Code Archive - Long-term storage for Google Code Project Hosting.
Google Code Archive - Long-term storage for Google Code Project Hosting.
GitHub - twitter/twemproxy: A fast, light-weight proxy for memcached and redis
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