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                [TOC] # 服役 當啟動regionserver時,regionserver會向HMaster注冊并開始接收本地數據. 開始的時候,新加入的節點不會有任何數據,平衡器開啟的情況下,將會有新的region移動到開啟的RegionServer上.如果啟動和停止進程是使用ssh和HBase腳本,那么會將新添加節點的主機名加入到`conf/regionservers`文件中 # 退役 ## 方案一 1. 停止負載平衡器 ~~~ hbase> balance_switch false ~~~ 2. 在退役節點上停止RegionServer ~~~ hbase> hbase-daemon.sh stop regionserver ~~~ 3. RegionServer一旦停止,會關閉維護的所有region 4. zookeeper上的該RegionServer節點消失 5. master節點檢測到該RegionServer下線,開啟平衡器 6. RegionServer的region服務得到重新分配 ## 方案二 1. RegionServer先卸載所管理的region ~~~ graceful_stop.sh <RegionServer-hostname> ~~~ 2. 自動平衡數據 3. 和之前的2~6步是一樣的
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