AccumuloDataVersion (Apache Accumulo Server Base 3.0.0 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`	`REMOVE_DEPRECATIONS_FOR_VERSION_3`	version (11) reflects removal of replication starting with 3.0
`static int`	`ROOT_TABLET_META_CHANGES`	version (10) reflects changes to how root tablet metadata is serialized in zookeeper starting with 2.1.

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.
`static int`	`getCurrentVersion(ServerContext context)`	Get the stored, current working version.
`static String`	`oldestUpgradeableVersionName()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - REMOVE_DEPRECATIONS_FOR_VERSION_3
```
public static final int REMOVE_DEPRECATIONS_FOR_VERSION_3
```
    version (11) reflects removal of replication starting with 3.0
    
    See Also:
    
    Constant Field Values
  - 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
  - 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
  - getCurrentVersion
```
public static int getCurrentVersion(ServerContext context)
```
    Get the stored, current working version.
    
    Parameters:
    
    context - the server context
    
    Returns:
    
    the stored data version
  - oldestUpgradeableVersionName
```
public static String oldestUpgradeableVersionName()
```