HBase table is empty, but regions are increased

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I created a table below, I have wrote some data to this table.

**Namespace   Table Name       Online Regions          Description**
default user_recommend_stories  17  'user_recommend_stories', {NAME => 'a', TTL => '259200 SECONDS (3 DAYS)'}, {NAME => 'c', TTL => '259200 SECONDS (3 DAYS)'}

The table was empty when I scan it after 3 days. But the number of online regions is still 17. How to release the space of these regions?

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Sergei Rodionov On

HBase doesn't support region deletes (or merges), neither manually nor as a result of compaction.