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HBase >> mail # user >> difference between major and minor compactions?

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difference between major and minor compactions?
Hi, All

I am asking the different practices of major and minor compaction... My
current understanding is that minor compaction, triggered automatically,
usually run along with online query serving (but in background), so that it
is important to make it as lightweight as possible... to minimise downtime
(pause time) of online query.

In contrast, the major compaction is invoked in  offpeak time and usually
can be assume to have resource exclusively. It may have a different
performance optimization goal...

Correct me if wrong, but let me know if HBase does design different
compaction mechanism this way..?