ScanServerSelector (Apache Accumulo Core 2.1.2 API)

All Known Implementing Classes:

ConfigurableScanServerSelector
```
public interface ScanServerSelector
```
A client side plugin that determines what scan servers to use for eventually consistent scans. When a scanner sets ScannerBase.setConsistencyLevel(ScannerBase.ConsistencyLevel) to ScannerBase.ConsistencyLevel.EVENTUAL then this plugin is used to determine which scan servers to use for a given tablet. To configure a class to use for this plugin, set its name using the client config scan.server.selector.impl

Since:

2.1.0

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static interface`	`ScanServerSelector.InitParameters`	This interface exists so that is easier to evolve what is passed to `init(InitParameters)` without having to make breaking changes.
`static interface`	`ScanServerSelector.SelectorParameters`	This interface exists so that is easier to evolve what is passed to `selectServers(SelectorParameters)` without having to make breaking changes.

Field Summary

Fields
Modifier and Type Field Description

static String DEFAULT_SCAN_SERVER_GROUP_NAME
The scan server group name that will be used when one is not specified.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default void`	`init(ScanServerSelector.InitParameters params)`	This method is called once after a `ScanServerSelector` is instantiated.
`ScanServerSelections`	`selectServers(ScanServerSelector.SelectorParameters params)`	Uses the `ScanServerSelector.SelectorParameters` to determine which, if any, ScanServer should be used for scanning a tablet.

- Field Detail
  - DEFAULT_SCAN_SERVER_GROUP_NAME
```
static final String DEFAULT_SCAN_SERVER_GROUP_NAME
```
    The scan server group name that will be used when one is not specified.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - init
```
default void init(ScanServerSelector.InitParameters params)
```
    This method is called once after a ScanServerSelector is instantiated.
  - selectServers
```
ScanServerSelections selectServers(ScanServerSelector.SelectorParameters params)
```
    Uses the ScanServerSelector.SelectorParameters to determine which, if any, ScanServer should be used for scanning a tablet.
    
    Parameters:
    
    params - parameters for the calculation
    
    Returns:
    
    results