knktc's Notes

If a Hadoop Streaming Python job cannot import a third-party library, pass PYTHONPATH through -cmdenv.

A tiny shared library that crashes on purpose, useful for testing how Python behaves when a ctypes-loaded C library segfaults.

A modified version of pssh that supports storing a different password for each host in the host list file.

When GPG works in a shell but fails in cron, adding --no-tty and --homedir usually fixes it.

Hive does not handle IN and NOT IN the same way as MySQL or PostgreSQL, so these patterns can be rewritten with joins.

A small shell script that estimates inbound traffic on a Linux network interface over a configurable time window.

A quick checklist for troubleshooting broken crontab jobs, including syntax issues, service status, file format, and permissions.

A short note about moving the blog and rebuilding it with GitHub Pages and Hexo.

The default first post generated by Hexo.