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hbase major compaction for table taking so much of time

I have first reduced table versions from 20 to 3 , as number of regions allocated to the table were too high and i suspect as versions configured were 20 hence this much of data got stored in hbase , also table is frequently getting updated .

my approach to reduce regions is to alter version from 20 to 3 for all the column families for the table and then run major compaction for the table from hbase cli . But major compaction is taking so much of time what is the reason for this ?

Kind Regards

Anurag Mishra