I always look for content delivered in visual medium whenever I try to learn new things. After watching videos, going through lengthy articles and ending up writing one such article myself, I found a very interesting comic to learn about HDFS protocols and internals.

Very well done Maneesh, you just saved some time for me. Hope to see more such comics in future.

##Reference
http://www.mail-archive.com/common-user@hadoop.apache.org/msg15171.html