Package com.bigdata.service

This package provides implementations of bigdata services (metadata service, data service, transaction manager service.

See: Description

Package com.bigdata.service Description

This package provides implementations of bigdata services (metadata service, data service, transaction manager service.

A bigdata federation is comprised of the following essential services:

metadata service
The metadata service manages scale-out indices and is used to locate index partitions.
data service
The data service supports reads and writes on index partitions.
Clients are responsible for discovering the metadata service. Clients then use the metadata service to manage scale-out indices and to locate and cache leases for data service instances having data for key range partitions that the client will read or write. If a client will use transactions (vs ACID batch operations), then the client must also locate the transaction manager service. Service location is performed using JINI, but other service locator protocols are possible.

bigdata provides the following optional services. These are not considered essential since (a) they are not required by clients that make direct use of bigdata as a distributed database; and (b) they are themselves applications of the services briefly described above.

transaction manager service
Clients use the transaction manager service to start new transactions and to coordinate the distributed commit protocol. The transaction manager also provides a centralized timestamp factory.
map and reduce service
Manages the distributed execution of a functional program.

deployment

In order to deploy a bigdata federation, the following preconditions must be met (a standalone deployment can be realized by meeting these preconditions on a single host). This will go more smoothly if JINI is running before you start the various bigdata services since they will then be able to register themselves immediately on startup. Service discovery by default uses the local network and the "public" group. If you want to run more than one bigdata federation on the same network, then you MUST edit the configuration file.

Hosts:

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