6.6 memcached 日志文件

每当NDB初始化内存缓存引擎时，它都会将包含时间戳和版本号的消息写入其日志文件，如下所示： 

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12-Oct-2011 13:40:00 PDT NDB Memcache 8.0.32-ndb-8.0.32 started
[NDB 8.0.32; MySQL 8.0.32-ndb-8.0.32]

它还会记录其连接到主集群的尝试： 

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Contacting primary management server (localhost:1186) ...
·Connected to "localhost:1186" as node id 4.

成功获取初始配置数据后，内存缓存引擎会记录一条描述配置的摘要消息，类似于此处显示的内容： 

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Retrieved 3 key prefixes for server role "default_role"
The default behavior is that:
 GET uses NDB only
 SET uses NDB only
 DELETE uses NDB only
The 2 explicitly defined key prefixes are "mc:" () and "t:" (demo_table_tabs)
Server started with 4 threads.

内存缓存引擎还记录每个附加集群连接的建立，如下所示： 

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Connected to "" as node id 5.

一条priming the pump...消息指示引擎将要预取事务对象池（API 连接记录）。紧随其后的是一条done ... 消息，指示预取使用了多少时间。在预取完成之前，服务器尚未准备好响应客户端。 

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Priming the pump ...
Scheduler: using 2 connections to cluster 0
Scheduler: starting for 1 cluster; c0,f0,t1
done [0.579 sec].

NDB 引擎完成初始化后，memcached 会打印一条消息来验证引擎是否已加载，并枚举其一些功能： 

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Loaded engine: NDB Memcache 8.0.32-ndb-8.0.32
Supplying the following features: compare and swap, persistent storage, LRU

如果启用了在线重新配置，NDB 引擎会记录每个重新配置以及新配置的摘要，类似于此处显示的内容： 

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Received update to server role default_role
Retrieved 3 key prefixes for server role "default_role".
The default behavior is that:
 GET uses NDB only
 SET uses NDB only
 DELETE uses NDB only.
The 2 explicitly defined key prefixes are "mc:" () and "t:" (demo_table_tabs)
ONLINE RECONFIGURATION COMPLETE

在关闭时，memcached 记录关闭序列的初始化和完成，NDB 引擎的调度程序也记录它自己的关闭： 

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Initiating shutdown
Shutting down scheduler.
Shutdown completed.