Module org.elasticsearch.server

Package org.elasticsearch.env

Class NodeMetadata

java.lang.Object

org.elasticsearch.env.NodeMetadata

public final class NodeMetadata
extends Object

Metadata associated with this node: its persistent node ID and its version. The metadata is persisted in the data folder of this node and is reused across restarts.

Field Summary

Fields

Modifier and Type	Field	Description
static final MetadataStateFormat<NodeMetadata>	FORMAT

Constructor Summary

Constructors

Constructor	Description
NodeMetadata(String nodeId, Version nodeVersion, Version oldestIndexVersion)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
int	hashCode()
String	nodeId()
Version	nodeVersion()
Version	oldestIndexVersion()
Version	previousNodeVersion()	When a node starts we read the existing node metadata from disk (see NodeEnvironment@loadNodeMetadata), store a reference to the node version that we read from there in previousNodeVersion and then proceed to upgrade the version to the current version of the node (upgradeToCurrentVersion() before storing the node metadata again on disk.
String	toString()
NodeMetadata	upgradeToCurrentVersion()
void	verifyUpgradeToCurrentVersion()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

FORMAT

public static final MetadataStateFormat<NodeMetadata> FORMAT

Constructor Details

NodeMetadata

public NodeMetadata(String nodeId,
 Version nodeVersion,
 Version oldestIndexVersion)

Method Details

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

nodeId

public String nodeId()

nodeVersion

public Version nodeVersion()

previousNodeVersion

public Version previousNodeVersion()

When a node starts we read the existing node metadata from disk (see NodeEnvironment@loadNodeMetadata), store a reference to the node version that we read from there in previousNodeVersion and then proceed to upgrade the version to the current version of the node (upgradeToCurrentVersion() before storing the node metadata again on disk. In doing so, previousNodeVersion refers to the previously last known version that this node was started on.

oldestIndexVersion

public Version oldestIndexVersion()

verifyUpgradeToCurrentVersion

public void verifyUpgradeToCurrentVersion()

upgradeToCurrentVersion

public NodeMetadata upgradeToCurrentVersion()