ClusterRules (Apache Dubbo 2.7.18 API)

```
public interface ClusterRules
```
constant for Cluster fault-tolerant mode

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`AVAILABLE`
`static String`	`BROADCAST` Call all providers by broadcast, call them one by one, and report an error if any one reports an error
`static String`	`EMPTY`
`static String`	`FAIL_BACK` When fails, record failure requests and schedule for retry on a regular interval.
`static String`	`FAIL_FAST` Execute exactly once, which means this policy will throw an exception immediately in case of an invocation error.
`static String`	`FAIL_OVER` When invoke fails, log the initial error and retry other invokers (retry n times, which means at most n different invokers will be invoked)
`static String`	`FAIL_SAFE` When invoke fails, log the error message and ignore this error by returning an empty Result.
`static String`	`FORKING` Invoke a specific number of invokers concurrently, usually used for demanding real-time operations, but need to waste more service resources.
`static String`	`MERGEABLE`

- Field Detail
  - FAIL_OVER
```
static final String FAIL_OVER
```
    When invoke fails, log the initial error and retry other invokers (retry n times, which means at most n different invokers will be invoked)
    
    See Also:
    
    Constant Field Values
  - FAIL_FAST
```
static final String FAIL_FAST
```
    Execute exactly once, which means this policy will throw an exception immediately in case of an invocation error.
    
    See Also:
    
    Constant Field Values
  - FAIL_SAFE
```
static final String FAIL_SAFE
```
    When invoke fails, log the error message and ignore this error by returning an empty Result.
    
    See Also:
    
    Constant Field Values
  - FAIL_BACK
```
static final String FAIL_BACK
```
    When fails, record failure requests and schedule for retry on a regular interval.
    
    See Also:
    
    Constant Field Values
  - FORKING
```
static final String FORKING
```
    Invoke a specific number of invokers concurrently, usually used for demanding real-time operations, but need to waste more service resources.
    
    See Also:
    
    Constant Field Values
  - BROADCAST
```
static final String BROADCAST
```
    Call all providers by broadcast, call them one by one, and report an error if any one reports an error
    
    See Also:
    
    Constant Field Values
  - AVAILABLE
```
static final String AVAILABLE
```
    See Also:
    
    Constant Field Values
  - MERGEABLE
```
static final String MERGEABLE
```
    See Also:
    
    Constant Field Values
  - EMPTY
```
static final String EMPTY
```
    See Also:
    
    Constant Field Values

Interface ClusterRules

Field Summary

Field Detail

FAIL_OVER

FAIL_FAST

FAIL_SAFE

FAIL_BACK

FORKING

BROADCAST

AVAILABLE

MERGEABLE

EMPTY