Error: Permissions 0644 for ‘/Users/xxx/.ssh/xxx.pem’ are too open. It is required that your private key files are NOT accessible by others. This private key will be ignored. Load key “/Users/xxx/.ssh/xxx.pem”: bad permissions

MediaType在网络协议的消息头里面叫做Content-Type：使用两部分的标识符来确定一个类型

Kylin运行一段时间后，Hive中会产生一些垃圾中间表。Kylin清理Hive临时表的脚本在3.0.0版本中才修复，针对旧版本的Kylin，可以通过脚本批量清理临时表。

Kylin will generate intermediate files in HDFS during the cube building; Besides, when purge/drop/merge cubes, some HBase tables may be left in HBase and will no longer be queried; Although Kylin has started to do some automated garbage collection, it might not cover all cases; You can do an offline storage cleanup periodically:

最近客户配置支付宝支付时，出现了ILLEGAL_PARTNER_EXTERFACE错误：调试错误，请回到请求来源地，重新发起请求。

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还记得之前编写的图片生成器 吗？我们再来编写另外一个，不过这次它将会返回一个 image.Image 的实现而非一个数据切片。

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有种常见的模式是一个 io.Reader 包装另一个 io.Reader，然后通过某种方式修改其数据流。

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实现一个 Reader 类型，它产生一个 ASCII 字符 ‘A’ 的无限流。

When I learning the golang tour and do the Stringer practice, I want to join the []byte element to a string. Here are the examples.