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select for update

Posted by 夏泽民 Oct 12, 2019

Mysql InnoDB 排他锁 用法： select … for update;

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statsd

Posted by 夏泽民 Oct 12, 2019

https://github.com/statsd/statsd https://github.com/smira/go-statsd

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runtime matrics

Posted by 夏泽民 Oct 12, 2019

自从Go 1.5开始，每次Go release, Gopher Brian Hatfield都会将自己对新版Go的runtime的性能数据（与之前Go版本的比较）在twitter上晒出来。就连Go team staff在世界各地做speaking时也在slide中引用Brian的图片。后来，Brian Hatfield将其用于度量runtime性能数据的代码打包成library并放在github上开源了，我们也可以使用这个library来建立我们自己的Go Runtime metrics设施了。这里简要说一下搭建的步骤。 https://github.com/bmhatfield/go-runtime-metrics http://graphiteapp.org/ https://github.com/statsd/statsd Brian Hatfield的go-runtime-metrics library实现的很简单，其runtime data来自于Go runtime package中的MemStats、NumGoroutine和NumCgoCall等。被测试目标程序只需要import该library即可输出runtime states数据：

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nowait

Posted by 夏泽民 Oct 12, 2019

1、for update 和 for update nowait 的区别：

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matrix

Posted by 夏泽民 Oct 12, 2019

Java 目前最为流行的 metrics 库是来自 Coda Hale 的 dropwizard/metrics，该库被广泛地应用于各个知名的开源项目中。例如 Hadoop，Kafka，Spark，JStorm 中。

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