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                觸發 Compaction(合并) 的時機有以下幾種: ? 通過 CompactionChecker 線程來定時檢查是否需要執行 compaction(RegionServer 啟動時在 initializeThreads() 中初始化),每隔 10000 秒(可配置)檢查一次。 ? 每當 RegionServer 發生一次 Memstore flush 操作之后也會進行檢查是否需要進行 Compaction 操作。 ? 手動觸發,執行命令 `major_compact` 、 `compact`。 ```sql hbase(main):002:0> major_compact Examples: Compact all regions in a table: hbase> major_compact 't1' hbase> major_compact 'ns1:t1' Compact an entire region: hbase> major_compact 'r1' Compact a single column family within a region: hbase> major_compact 'r1', 'c1' Compact a single column family within a table: hbase> major_compact 't1', 'c1' hbase(main):003:0> compact Examples: Compact all regions in a table: hbase> compact 'ns1:t1' hbase> compact 't1' Compact an entire region: hbase> compact 'r1' Compact only a column family within a region: hbase> compact 'r1', 'c1' Compact a column family within a table: hbase> compact 't1', 'c1' ```
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