AccumuloDataVersion (Apache Accumulo Server Base 2.1.0 API)

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 Set<Integer>`	`CAN_RUN`
`static int`	`CRYPTO_CHANGES`	version (9) reflects changes to crypto that resulted in RFiles and WALs being serialized differently in version 2.0.0.
`static int`	`ROOT_TABLET_META_CHANGES`	version (10) reflects changes to how root tablet metadata is serialized in zookeeper starting with 2.1.
`static 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

All Methods Static Methods Concrete Methods
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 Detail
  - 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 Detail
  - AccumuloDataVersion
```
public AccumuloDataVersion()
```
- Method Detail
  - 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