Package org.apache.hadoop.hdfs.protocol

Class HdfsConstants

java.lang.Object

org.apache.hadoop.hdfs.protocol.HdfsConstants

@Private
public final class HdfsConstants
extends java.lang.Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	HdfsConstants.DatanodeReportType
static class	HdfsConstants.ReencryptAction	Re-encrypt encryption zone actions.
static class	HdfsConstants.RollingUpgradeAction
static class	HdfsConstants.SafeModeAction
static class	HdfsConstants.StoragePolicy	This enum wraps above Storage Policy ID and name.
static class	HdfsConstants.StoragePolicySatisfierMode	Storage policy satisfier service modes.
static class	HdfsConstants.UpgradeAction	Upgrade actions.

Field Summary

Fields

Modifier and Type	Field	Description
static byte	ALLNVDIMM_STORAGE_POLICY_ID
static java.lang.String	ALLNVDIMM_STORAGE_POLICY_NAME
static byte	ALLSSD_STORAGE_POLICY_ID
static java.lang.String	ALLSSD_STORAGE_POLICY_NAME
static byte	BLOCK_STORAGE_POLICY_ID_UNSPECIFIED
static int	BYTES_IN_INTEGER
static java.lang.String	CLIENT_NAMENODE_PROTOCOL_NAME	HDFS Protocol Names:
static byte	COLD_STORAGE_POLICY_ID
static java.lang.String	COLD_STORAGE_POLICY_NAME
static int	DEFAULT_DATA_SOCKET_SIZE
static java.lang.String	DOT_INODES_STRING
static java.lang.String	DOT_RESERVED_PATH_PREFIX
static java.lang.String	DOT_RESERVED_STRING
static java.lang.String	DOT_SNAPSHOT_DIR	A special path component contained in the path for a snapshot file/dir
static java.lang.String	DOT_SNAPSHOT_DIR_SEPARATOR
static long	GRANDFATHER_GENERATION_STAMP	Generation stamp of blocks that pre-date the introduction of a generation stamp.
static long	GRANDFATHER_INODE_ID	The inode id validation of lease check will be skipped when the request uses GRANDFATHER_INODE_ID for backward compatibility.
static java.lang.String	HA_DT_SERVICE_PREFIX	A prefix put before the namenode URI inside the "service" field of a delgation token, indicating that the URI is a logical (HA) URI.
static java.lang.String	HDFS_URI_SCHEME	URI Scheme for hdfs://namenode/ URIs.
static byte	HOT_STORAGE_POLICY_ID
static java.lang.String	HOT_STORAGE_POLICY_NAME
static long	LEASE_SOFTLIMIT_PERIOD	For a HDFS client to write to a file, a lease is granted; During the lease period, no other client can write to the file.
static byte	MEMORY_STORAGE_POLICY_ID
static java.lang.String	MEMORY_STORAGE_POLICY_NAME
static byte	ONESSD_STORAGE_POLICY_ID
static java.lang.String	ONESSD_STORAGE_POLICY_NAME
static byte	PROVIDED_STORAGE_POLICY_ID
static java.lang.String	PROVIDED_STORAGE_POLICY_NAME
static long	QUOTA_DONT_SET
static long	QUOTA_RESET
static int	READ_TIMEOUT
static int	READ_TIMEOUT_EXTENSION
static java.lang.String	ROUTER_ADMIN_PROTOCOL_NAME	Router admin Protocol Names.
static java.lang.String	SAFEMODE_EXCEPTION_CLASS_NAME
static java.lang.String	SEPARATOR_DOT_SNAPSHOT_DIR
static java.lang.String	SEPARATOR_DOT_SNAPSHOT_DIR_SEPARATOR
static byte	WARM_STORAGE_POLICY_ID
static java.lang.String	WARM_STORAGE_POLICY_NAME
static int	WRITE_TIMEOUT
static int	WRITE_TIMEOUT_EXTENSION

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	HdfsConstants()

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

QUOTA_DONT_SET

public static final long QUOTA_DONT_SET

See Also:

Constant Field Values

QUOTA_RESET

public static final long QUOTA_RESET

See Also:

Constant Field Values

BYTES_IN_INTEGER

public static final int BYTES_IN_INTEGER

See Also:

Constant Field Values

HDFS_URI_SCHEME

public static final java.lang.String HDFS_URI_SCHEME

URI Scheme for hdfs://namenode/ URIs.

See Also:

Constant Field Values

MEMORY_STORAGE_POLICY_ID

public static final byte MEMORY_STORAGE_POLICY_ID

See Also:

Constant Field Values

MEMORY_STORAGE_POLICY_NAME

public static final java.lang.String MEMORY_STORAGE_POLICY_NAME

See Also:

Constant Field Values

ALLNVDIMM_STORAGE_POLICY_ID

public static final byte ALLNVDIMM_STORAGE_POLICY_ID

See Also:

Constant Field Values

ALLNVDIMM_STORAGE_POLICY_NAME

public static final java.lang.String ALLNVDIMM_STORAGE_POLICY_NAME

See Also:

Constant Field Values

ALLSSD_STORAGE_POLICY_ID

public static final byte ALLSSD_STORAGE_POLICY_ID

See Also:

Constant Field Values

ALLSSD_STORAGE_POLICY_NAME

public static final java.lang.String ALLSSD_STORAGE_POLICY_NAME

See Also:

Constant Field Values

ONESSD_STORAGE_POLICY_ID

public static final byte ONESSD_STORAGE_POLICY_ID

See Also:

Constant Field Values

ONESSD_STORAGE_POLICY_NAME

public static final java.lang.String ONESSD_STORAGE_POLICY_NAME

See Also:

Constant Field Values

HOT_STORAGE_POLICY_ID

public static final byte HOT_STORAGE_POLICY_ID

See Also:

Constant Field Values

HOT_STORAGE_POLICY_NAME

public static final java.lang.String HOT_STORAGE_POLICY_NAME

See Also:

Constant Field Values

WARM_STORAGE_POLICY_ID

public static final byte WARM_STORAGE_POLICY_ID

See Also:

Constant Field Values

WARM_STORAGE_POLICY_NAME

public static final java.lang.String WARM_STORAGE_POLICY_NAME

See Also:

Constant Field Values

COLD_STORAGE_POLICY_ID

public static final byte COLD_STORAGE_POLICY_ID

See Also:

Constant Field Values

COLD_STORAGE_POLICY_NAME

public static final java.lang.String COLD_STORAGE_POLICY_NAME

See Also:

Constant Field Values

PROVIDED_STORAGE_POLICY_ID

public static final byte PROVIDED_STORAGE_POLICY_ID

See Also:

Constant Field Values

PROVIDED_STORAGE_POLICY_NAME

public static final java.lang.String PROVIDED_STORAGE_POLICY_NAME

See Also:

Constant Field Values

DEFAULT_DATA_SOCKET_SIZE

public static final int DEFAULT_DATA_SOCKET_SIZE

See Also:

Constant Field Values

DOT_SNAPSHOT_DIR

public static final java.lang.String DOT_SNAPSHOT_DIR

A special path component contained in the path for a snapshot file/dir

See Also:

Constant Field Values

SEPARATOR_DOT_SNAPSHOT_DIR

public static final java.lang.String SEPARATOR_DOT_SNAPSHOT_DIR

See Also:

Constant Field Values

DOT_SNAPSHOT_DIR_SEPARATOR

public static final java.lang.String DOT_SNAPSHOT_DIR_SEPARATOR

See Also:

Constant Field Values

SEPARATOR_DOT_SNAPSHOT_DIR_SEPARATOR

public static final java.lang.String SEPARATOR_DOT_SNAPSHOT_DIR_SEPARATOR

See Also:

Constant Field Values

DOT_RESERVED_STRING

public static final java.lang.String DOT_RESERVED_STRING

See Also:

Constant Field Values

DOT_RESERVED_PATH_PREFIX

public static final java.lang.String DOT_RESERVED_PATH_PREFIX

See Also:

Constant Field Values

DOT_INODES_STRING

public static final java.lang.String DOT_INODES_STRING

See Also:

Constant Field Values

GRANDFATHER_GENERATION_STAMP

public static final long GRANDFATHER_GENERATION_STAMP

Generation stamp of blocks that pre-date the introduction of a generation stamp.

See Also:

Constant Field Values

GRANDFATHER_INODE_ID

public static final long GRANDFATHER_INODE_ID

The inode id validation of lease check will be skipped when the request uses GRANDFATHER_INODE_ID for backward compatibility.

See Also:

Constant Field Values

BLOCK_STORAGE_POLICY_ID_UNSPECIFIED

public static final byte BLOCK_STORAGE_POLICY_ID_UNSPECIFIED

See Also:

Constant Field Values

HA_DT_SERVICE_PREFIX

public static final java.lang.String HA_DT_SERVICE_PREFIX

A prefix put before the namenode URI inside the "service" field of a delgation token, indicating that the URI is a logical (HA) URI.

See Also:

Constant Field Values

SAFEMODE_EXCEPTION_CLASS_NAME

public static final java.lang.String SAFEMODE_EXCEPTION_CLASS_NAME

See Also:

Constant Field Values

CLIENT_NAMENODE_PROTOCOL_NAME

public static final java.lang.String CLIENT_NAMENODE_PROTOCOL_NAME

HDFS Protocol Names:

See Also:

Constant Field Values

ROUTER_ADMIN_PROTOCOL_NAME

public static final java.lang.String ROUTER_ADMIN_PROTOCOL_NAME

Router admin Protocol Names.

See Also:

Constant Field Values

READ_TIMEOUT

public static final int READ_TIMEOUT

See Also:

Constant Field Values

READ_TIMEOUT_EXTENSION

public static final int READ_TIMEOUT_EXTENSION

See Also:

Constant Field Values

WRITE_TIMEOUT

public static final int WRITE_TIMEOUT

See Also:

Constant Field Values

WRITE_TIMEOUT_EXTENSION

public static final int WRITE_TIMEOUT_EXTENSION

See Also:

Constant Field Values

LEASE_SOFTLIMIT_PERIOD

public static final long LEASE_SOFTLIMIT_PERIOD

For a HDFS client to write to a file, a lease is granted; During the lease period, no other client can write to the file. The writing client can periodically renew the lease. When the file is closed, the lease is revoked. The lease duration is bound by this soft limit and a HdfsClientConfigKeys.DFS_LEASE_HARDLIMIT_KEY. Until the soft limit expires, the writer has sole write access to the file. If the soft limit expires and the client fails to close the file or renew the lease, another client can preempt the lease.

See Also:

Constant Field Values

Constructor Detail

HdfsConstants

protected HdfsConstants()