Grokking the Advanced System Design Interview
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Working with Tablets
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Locating Tablets

Since Tablets move around from server to server (due to load balancing, Tablet server failures, etc.), given a row, how do we find the correct Tablet server? To answer this, we need to find the Tablet whose row range covers the target row. BigTable maintains a 3-level hierarchy, analogous to that of a

B+ tree
, to store Tablet location information.

BigTable creates a special table, called Metadata table, to store Tablet locations

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