Package org.elasticsearch.gateway

Class MetaStateService

java.lang.Object

org.elasticsearch.gateway.MetaStateService

public class MetaStateService
extends Object

Handles writing and loading Manifest, Metadata and IndexMetadata as used for cluster state persistence in versions prior to Version.V_7_6_0, used to read this older format during an upgrade from these versions.

Field Summary

Fields

Modifier and Type	Field	Description
final org.elasticsearch.xcontent.NamedXContentRegistry	namedXContentRegistry
final NodeEnvironment	nodeEnv

Constructor Summary

Constructors

Constructor	Description
MetaStateService(NodeEnvironment nodeEnv, org.elasticsearch.xcontent.NamedXContentRegistry namedXContentRegistry)

Method Summary

Modifier and Type	Method	Description
void	deleteAll()	Removes manifest file, global metadata and all index metadata
org.elasticsearch.core.Tuple<Manifest,Metadata>	loadFullState()	Loads the full state, which includes both the global state and all the indices meta data.
IndexMetadata	loadIndexState(Index index)	Loads the index state for the provided index name, returning null if doesn't exists.
void	unreferenceAll()	Creates empty cluster state file on disk, deleting global metadata and unreferencing all index metadata (only used for dangling indices at that point).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

nodeEnv

public final NodeEnvironment nodeEnv

namedXContentRegistry

public final org.elasticsearch.xcontent.NamedXContentRegistry namedXContentRegistry

Constructor Details

MetaStateService

public MetaStateService(NodeEnvironment nodeEnv,
 org.elasticsearch.xcontent.NamedXContentRegistry namedXContentRegistry)

Method Details

loadFullState

public org.elasticsearch.core.Tuple<Manifest,Metadata> loadFullState()
                                                              throws IOException

Loads the full state, which includes both the global state and all the indices meta data.
When loading, manifest file is consulted (represented by Manifest class), to load proper generations.
If there is no manifest file on disk, this method fallbacks to BWC mode, where latest generation of global and indices metadata is loaded. Please note that currently there is no way to distinguish between manifest file being removed and manifest file was not yet created. It means that this method always fallbacks to BWC mode, if there is no manifest file.

Returns:

tuple of Manifest and Metadata with global metadata and indices metadata. If there is no state on disk, meta state with globalGeneration -1 and empty meta data is returned.

Throws:

IOException - if some IOException when loading files occurs or there is no metadata referenced by manifest file.

loadIndexState

@Nullable
public IndexMetadata loadIndexState(Index index)
                             throws IOException

Loads the index state for the provided index name, returning null if doesn't exists.

Throws:

IOException

unreferenceAll

public void unreferenceAll()
                    throws IOException

Creates empty cluster state file on disk, deleting global metadata and unreferencing all index metadata (only used for dangling indices at that point).

Throws:

IOException

deleteAll

public void deleteAll()
               throws IOException

Removes manifest file, global metadata and all index metadata

Throws:

IOException