Adam Clarke on Job 21:17

How oft is the candle of the wicked put out? - The candle or lamp is often used, both as the emblem of prosperity and of posterity. Oftentimes the rejoicing of the wicked is short; and, not unfrequently, his seed is cut off from the earth. The root is dried up, and the branch is withered.

God distributeth sorrows in his anger - He must be incensed against those who refuse to know, serve, and pray unto him. In his anger, therefore, he portions out to each his due share of misery, vexation, and wo.