March 2019
Intermediate to advanced
636 pages
27h 50m
English
book
Blockchain Development with Hyperledger
by Salman A. Baset, Luc Desrosiers, Nitin Gaur, Petr Novotny
Content preview from Blockchain Development with Hyperledger
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ReadSet and WriteSet
On receipt of a transaction invocation message from a client, the endorsing peer executes a transaction. The execution invokes the chaincode in the context of the peer's Worldstate and records all reads and writes of its data on the ledger into a ReadSet and WriteSet.
The transaction's WriteSet contains a list of key and value pairs that were modified during the execution by the chaincode. When the value of a key is modified (that is, a new key and value are recorded or an existing key is updated with a new value), the WriteSet will contain the updated key and value pair.
When a key is deleted, the WriteSet will contain the key with an attribute marking the key as deleted. If a single key is modified multiple times during ...
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