December 2012
Intermediate to advanced
572 pages
13h 8m
Chinese
Content preview from HBASE技術手冊
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架構
|
365
此設計中所使用的複製格式，在概念上類似於 MySQL 的敘述基礎複製（statement-based
replication）
8
。並不是使用 SQL 描述語言，而是會複製整個
WALEdits
來保持其單純性，
包含來自於客戶端的
Put
和
Delete
的多儲存單元（multiple cell）的插入動作。
每個 region 伺服器的
HLogs
是 HBase 複製的基礎，同時只要這些日誌需要被複製到
其他的 slave 叢集上時，它們就必須要保存在 HDFS 上。每個 region 伺服器會從它們
所需要複製的最舊的日誌開始讀取，同時為簡化錯誤復原，會將當前讀取位置保存到
ZooKeeper 上。對於每一個 slave 叢集來說，該位置可能是不同的，如同
HLogs
佇列的
處理方式。
參與複製的各叢集大小可能不是對稱的，同時 master 叢集會依賴隨機化，來
盡量確保
（
best effort
）在 slave 叢集上的複製工作流的平衡。
日誌更新的生命週期
在下面的幾 節，將說明從一個客戶端與 master 叢集溝通的所有方式，一直到單一 slave
叢集，在單一異動更新的生命週期。
正常處理
客戶端會使用 HBase API 將
Put
、
Delete
，或
Increment
發送給 region 伺服器。key/
value 會被 region 伺服器轉換為一個
WALEdit
，而且
WALEdit
會被複製程式碼來檢查；對
於每一個複製範圍內的 family，會加入到異動的範圍中。異動會被加入到目前的 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.