Package com.yahoo.vespa.model.content.engines

Interface PersistenceEngine.PersistenceFactory

All Known Implementing Classes:

DummyPersistence.Factory, ProtonEngine.Factory

Enclosing class:

PersistenceEngine

public static interface PersistenceEngine.PersistenceFactory

Creates a config producer for the engines provider at a given node.

Method Summary

Modifier and Type	Method	Description
PersistenceEngine	create(DeployState deployState, StorageNode storageNode, StorageGroup parentGroup, ModelElement storageNodeElement)
boolean	enableMultiLevelSplitting()	Multi level splitting can increase split performance a lot where documents have been co-localized, for backends where retrieving document identifiers contained in bucket is cheap.
ContentCluster.DistributionMode	getDefaultDistributionMode()
boolean	supportRevert()	If a write request succeeds on some nodes and fails on others, causing request to fail to client, the content layer will revert the operation where it succeeded if reverts are supported.

Method Detail

create

PersistenceEngine create(DeployState deployState,
                         StorageNode storageNode,
                         StorageGroup parentGroup,
                         ModelElement storageNodeElement)

supportRevert

boolean supportRevert()

If a write request succeeds on some nodes and fails on others, causing request to fail to client, the content layer will revert the operation where it succeeded if reverts are supported. (Typically require backend to keep multiple entries of the same document identifier persisted at the same time)

enableMultiLevelSplitting

boolean enableMultiLevelSplitting()

Multi level splitting can increase split performance a lot where documents have been co-localized, for backends where retrieving document identifiers contained in bucket is cheap. Backends where split is cheaper than fetching document identifiers will not want to enable multi level splitting.

getDefaultDistributionMode

ContentCluster.DistributionMode getDefaultDistributionMode()