Package org.apache.hadoop.hdfs.server.common

Class StorageInfo

java.lang.Object

org.apache.hadoop.hdfs.server.common.StorageInfo

Direct Known Subclasses:

CheckpointSignature, NamenodeRegistration, NamespaceInfo, Storage

@Private
public class StorageInfo
extends Object

Common class for storage information. TODO namespaceID should be long and computed as hash(address + port)

Field Summary

Fields

Modifier and Type	Field	Description
String	clusterID
long	cTime
int	layoutVersion
int	namespaceID
protected static final String	STORAGE_FILE_VERSION
protected final HdfsServerConstants.NodeType	storageType

Constructor Summary

Constructors

Constructor	Description
StorageInfo(int layoutV, int nsID, String cid, long cT, HdfsServerConstants.NodeType type)
StorageInfo(HdfsServerConstants.NodeType type)
StorageInfo(StorageInfo from)

Method Summary

Modifier and Type	Method	Description
protected void	checkStorageType(Properties props, Storage.StorageDirectory sd)	Validate and set storage type from Properties
String	getClusterID()	cluster id of the file system.
static String	getClusterIdFromColonSeparatedString(String in)
long	getCTime()	Creation time of the file system state.
int	getLayoutVersion()	Layout version of the storage data.
int	getNamespaceID()	Namespace id of the file system.
static int	getNsIdFromColonSeparatedString(String in)
protected static String	getProperty(Properties props, Storage.StorageDirectory sd, String name)
Map<Integer,SortedSet<LayoutVersion.LayoutFeature>>	getServiceLayoutFeatureMap()
int	getServiceLayoutVersion()
void	readPreviousVersionProperties(Storage.StorageDirectory sd)	Read properties from the the previous/VERSION file in the given storage directory.
void	readProperties(Storage.StorageDirectory sd)	Read properties from the VERSION file in the given storage directory.
static Properties	readPropertiesFile(File from)
protected void	setClusterId(Properties props, int layoutVersion, Storage.StorageDirectory sd)	Validate and set clusterId from Properties
protected void	setcTime(Properties props, Storage.StorageDirectory sd)	Validate and set ctime from Properties
protected void	setFieldsFromProperties(Properties props, Storage.StorageDirectory sd)	Get common storage fields.
protected void	setLayoutVersion(Properties props, Storage.StorageDirectory sd)	Validate and set layout version from Properties
protected void	setNamespaceID(Properties props, Storage.StorageDirectory sd)	Validate and set namespaceID version from Properties
void	setServiceLayoutVersion(int lv)
void	setStorageInfo(StorageInfo from)
String	toColonSeparatedString()
String	toMapString()	Returns string representation of Storage info attributes stored in Map.
String	toString()
boolean	versionSupportsFederation(Map<Integer,SortedSet<LayoutVersion.LayoutFeature>> map)

Methods inherited from class java.lang.Object

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

Field Details

layoutVersion

public int layoutVersion

namespaceID

public int namespaceID

clusterID

public String clusterID

cTime

public long cTime

storageType

protected final HdfsServerConstants.NodeType storageType

STORAGE_FILE_VERSION

protected static final String STORAGE_FILE_VERSION

See Also:

• Constant Field Values

Constructor Details

StorageInfo

public StorageInfo(HdfsServerConstants.NodeType type)

StorageInfo

public StorageInfo(int layoutV,
 int nsID,
 String cid,
 long cT,
 HdfsServerConstants.NodeType type)

StorageInfo

public StorageInfo(StorageInfo from)

Method Details

getLayoutVersion

public int getLayoutVersion()

Layout version of the storage data.

getNamespaceID

public int getNamespaceID()

Namespace id of the file system.

Assigned to the file system at formatting and never changes after that. Shared by all file system components.

getClusterID

public String getClusterID()

cluster id of the file system.

getCTime

public long getCTime()

Creation time of the file system state.

Modified during upgrades.

setStorageInfo

public void setStorageInfo(StorageInfo from)

versionSupportsFederation

public boolean versionSupportsFederation(Map<Integer,SortedSet<LayoutVersion.LayoutFeature>> map)

toString

public String toString()

Overrides:

toString in class Object

toMapString

public String toMapString()

Returns string representation of Storage info attributes stored in Map.

Returns:

string representation of storage info attributes.

toColonSeparatedString

public String toColonSeparatedString()

getNsIdFromColonSeparatedString

public static int getNsIdFromColonSeparatedString(String in)

getClusterIdFromColonSeparatedString

public static String getClusterIdFromColonSeparatedString(String in)

readProperties

public void readProperties(Storage.StorageDirectory sd)
                    throws IOException

Read properties from the VERSION file in the given storage directory.

Throws:

IOException

readPreviousVersionProperties

public void readPreviousVersionProperties(Storage.StorageDirectory sd)
                                   throws IOException

Read properties from the the previous/VERSION file in the given storage directory.

Throws:

IOException

setFieldsFromProperties

protected void setFieldsFromProperties(Properties props,
 Storage.StorageDirectory sd)
                                throws IOException

Get common storage fields. Should be overloaded if additional fields need to be get.

Parameters:

props - properties

Throws:

IOException - on error

checkStorageType

protected void checkStorageType(Properties props,
 Storage.StorageDirectory sd)
                         throws InconsistentFSStateException

Validate and set storage type from Properties

Throws:

InconsistentFSStateException

setcTime

protected void setcTime(Properties props,
 Storage.StorageDirectory sd)
                 throws InconsistentFSStateException

Validate and set ctime from Properties

Throws:

InconsistentFSStateException

setClusterId

protected void setClusterId(Properties props,
 int layoutVersion,
 Storage.StorageDirectory sd)
                     throws InconsistentFSStateException

Validate and set clusterId from Properties

Throws:

InconsistentFSStateException

setLayoutVersion

protected void setLayoutVersion(Properties props,
 Storage.StorageDirectory sd)
                         throws IncorrectVersionException,
InconsistentFSStateException

Validate and set layout version from Properties

Throws:

IncorrectVersionException

InconsistentFSStateException

setNamespaceID

protected void setNamespaceID(Properties props,
 Storage.StorageDirectory sd)
                       throws InconsistentFSStateException

Validate and set namespaceID version from Properties

Throws:

InconsistentFSStateException

setServiceLayoutVersion

public void setServiceLayoutVersion(int lv)

getServiceLayoutVersion

public int getServiceLayoutVersion()

getServiceLayoutFeatureMap

public Map<Integer,SortedSet<LayoutVersion.LayoutFeature>> getServiceLayoutFeatureMap()

getProperty

protected static String getProperty(Properties props,
 Storage.StorageDirectory sd,
 String name)
                             throws InconsistentFSStateException

Throws:

InconsistentFSStateException

readPropertiesFile

public static Properties readPropertiesFile(File from)
                                     throws IOException

Throws:

IOException