.META. 's Region Server will be well known by ZooKeeper,
So Master Node can know where to read it by talking to ZooKeeper.
Once .META. is cached, Master can find any data lives in HBase
HBase VS Other NoSQL
- Great large Scalibility
- Strict Consistency
- Availability not perfect, but can be managed
- Integrates with Hadoop
Very efficient bulk loads and MapReduce analysis - Ordered range partitions(not Hash)
- Automatically shards/scales(just add more servers)
- Sparse storage(for each row)
Compare to RDBMS
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