Package org.apache.accumulo.server

Class AccumuloDataVersion

java.lang.Object

org.apache.accumulo.server.AccumuloDataVersion

public class AccumuloDataVersion
extends Object

Class representing the version of data stored in Accumulo. This version is separate but related to the file specific version in RFile. A version change to RFile will reflect a version change to the AccumuloDataVersion. But a version change to the AccumuloDataVersion may not affect the version number in RFile. For example, changes made to other parts of Accumulo that affects how data is stored, like the metadata table, would change the AccumuloDataVersion number here but not in RFile. This number is stored in HDFS under Constants.VERSION_DIR. This class is used for checking the version during server startup and upgrades.

Field Summary

Fields

Modifier and Type	Field	Description
static final Set<Integer>	CAN_RUN
static final int	CRYPTO_CHANGES	version (9) reflects changes to crypto that resulted in RFiles and WALs being serialized differently in version 2.0.0.
static final int	ROOT_TABLET_META_CHANGES	version (10) reflects changes to how root tablet metadata is serialized in zookeeper starting with 2.1.
static final int	SHORTEN_RFILE_KEYS	version (8) reflects changes to RFile index (ACCUMULO-1124) AND the change to WAL tracking in ZK in version 1.8.0

Constructor Summary

Constructors

Constructor	Description
AccumuloDataVersion()

Method Summary

Modifier and Type	Method	Description
static int	get()	Get the current Accumulo Data Version.

Methods inherited from class java.lang.Object

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

Field Details

ROOT_TABLET_META_CHANGES

public static final int ROOT_TABLET_META_CHANGES

version (10) reflects changes to how root tablet metadata is serialized in zookeeper starting with 2.1. See RootTabletMetadata.

See Also:

• Constant Field Values

CRYPTO_CHANGES

public static final int CRYPTO_CHANGES

version (9) reflects changes to crypto that resulted in RFiles and WALs being serialized differently in version 2.0.0. Also RFiles in 2.0.0 may have summary data.

See Also:

• Constant Field Values

SHORTEN_RFILE_KEYS

public static final int SHORTEN_RFILE_KEYS

version (8) reflects changes to RFile index (ACCUMULO-1124) AND the change to WAL tracking in ZK in version 1.8.0

See Also:

• Constant Field Values

CAN_RUN

public static final Set<Integer> CAN_RUN

Constructor Details

AccumuloDataVersion

public AccumuloDataVersion()

Method Details

get

public static int get()

Get the current Accumulo Data Version. See Javadoc of static final integers for a detailed description of that version.

Returns:

integer representing the Accumulo Data Version