Boardcast variable causes Spark driver OOM
Monitor broadcast variable’s size.
Fail to distinguish alarm emails due to similar subject
Make alarm email subject different at length.
rm -r ~/ deletes public key
It’s a very risky command.
Redis OOM due to big keys
Frequently get big key -> hit network limit -> message backlog in buffer -> OOM
MySQL connection pool size too small causes deadlock
A small-sized connection pool (such as 1, 2) may cause deadlock.
Why signal file is a bad idea
Replace it with direct API call
Yisheng's blog 