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

Interface HdfsServerConstants

@Private
public interface HdfsServerConstants

Some handy internal HDFS constants

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	HdfsServerConstants.BlockUCState	States, which a block can go through while it is under construction.
static class	HdfsServerConstants.NamenodeRole	Defines the NameNode role.
static class	HdfsServerConstants.NodeType	Type of the node
static class	HdfsServerConstants.ReplicaState	Block replica states, which it can go through while being constructed.
static class	HdfsServerConstants.RollingUpgradeStartupOption	Startup options for rolling upgrade.
static class	HdfsServerConstants.StartupOption	Startup options

Field Summary

Fields

Modifier and Type	Field	Description
static long	BLOCK_GROUP_INDEX_MASK
static java.lang.String	CRYPTO_XATTR_ENCRYPTION_ZONE
static java.lang.String	CRYPTO_XATTR_FILE_ENCRYPTION_INFO
static byte[]	DOT_SNAPSHOT_DIR_BYTES
static long	INVALID_TXID
static long	LEASE_RECOVER_PERIOD
static long	MAX_BANDWIDTH_PER_DATANODE
static byte	MAX_BLOCKS_IN_GROUP
static int	MAX_PATH_DEPTH
static int	MAX_PATH_LENGTH
static int	MIN_BLOCKS_FOR_WRITE
static int	MINIMUM_COMPATIBLE_NAMENODE_LAYOUT_VERSION	Current minimum compatible version for NameNode Please see NameNodeLayoutVersion.Feature on adding new layout version.
static org.apache.hadoop.fs.Path	MOVER_ID_PATH
static int	NAMENODE_LAYOUT_VERSION	Current layout version for NameNode.
static java.lang.String	NAMENODE_LEASE_HOLDER
static long	RESERVED_LEGACY_GENERATION_STAMPS
static java.lang.String[]	RESERVED_PATH_COMPONENTS	Path components that are reserved in HDFS.
static java.lang.String	SECURITY_XATTR_UNREADABLE_BY_SUPERUSER
static java.lang.String	XATTR_ERASURECODING_POLICY
static java.lang.String	XATTR_SATISFY_STORAGE_POLICY
static java.lang.String	XATTR_SNAPSHOT_DELETED

Field Detail

MIN_BLOCKS_FOR_WRITE

static final int MIN_BLOCKS_FOR_WRITE

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Constant Field Values

LEASE_RECOVER_PERIOD

static final long LEASE_RECOVER_PERIOD

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MAX_PATH_LENGTH

static final int MAX_PATH_LENGTH

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MAX_PATH_DEPTH

static final int MAX_PATH_DEPTH

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INVALID_TXID

static final long INVALID_TXID

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Constant Field Values

RESERVED_LEGACY_GENERATION_STAMPS

static final long RESERVED_LEGACY_GENERATION_STAMPS

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Constant Field Values

NAMENODE_LAYOUT_VERSION

static final int NAMENODE_LAYOUT_VERSION

Current layout version for NameNode. Please see NameNodeLayoutVersion.Feature on adding new layout version.

MINIMUM_COMPATIBLE_NAMENODE_LAYOUT_VERSION

static final int MINIMUM_COMPATIBLE_NAMENODE_LAYOUT_VERSION

Current minimum compatible version for NameNode Please see NameNodeLayoutVersion.Feature on adding new layout version.

RESERVED_PATH_COMPONENTS

static final java.lang.String[] RESERVED_PATH_COMPONENTS

Path components that are reserved in HDFS.

.reserved is only reserved under root ("/").

DOT_SNAPSHOT_DIR_BYTES

static final byte[] DOT_SNAPSHOT_DIR_BYTES

NAMENODE_LEASE_HOLDER

static final java.lang.String NAMENODE_LEASE_HOLDER

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Constant Field Values

CRYPTO_XATTR_ENCRYPTION_ZONE

static final java.lang.String CRYPTO_XATTR_ENCRYPTION_ZONE

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CRYPTO_XATTR_FILE_ENCRYPTION_INFO

static final java.lang.String CRYPTO_XATTR_FILE_ENCRYPTION_INFO

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SECURITY_XATTR_UNREADABLE_BY_SUPERUSER

static final java.lang.String SECURITY_XATTR_UNREADABLE_BY_SUPERUSER

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XATTR_ERASURECODING_POLICY

static final java.lang.String XATTR_ERASURECODING_POLICY

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XATTR_SNAPSHOT_DELETED

static final java.lang.String XATTR_SNAPSHOT_DELETED

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XATTR_SATISFY_STORAGE_POLICY

static final java.lang.String XATTR_SATISFY_STORAGE_POLICY

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MOVER_ID_PATH

static final org.apache.hadoop.fs.Path MOVER_ID_PATH

BLOCK_GROUP_INDEX_MASK

static final long BLOCK_GROUP_INDEX_MASK

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MAX_BLOCKS_IN_GROUP

static final byte MAX_BLOCKS_IN_GROUP

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MAX_BANDWIDTH_PER_DATANODE

static final long MAX_BANDWIDTH_PER_DATANODE

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Constant Field Values