What does cassandra do during compaction?

I know that cassandra merges sstables, row-keys,remove tombstone and all. But i am really interested to know how it performs compaction ?

efficient way to convert scatter indices into gather indices?

I\'m trying to write a stream compaction (take an array and get rid of empty elements) with SIMD intrinsics. Each iteration of the loop processes 8 elements at a time (SIMD width).

Thrust: Removing duplicates in key-value arrays

I have a pair of arrays of equal size, I will call them开发者_JAVA技巧 keys and values. For example:

有趣的快餐店店名？