MasterCallable (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.client.MasterCallable<V>

Type Parameters:
V - return type

All Implemented Interfaces:

Closeable, AutoCloseable, RetryingCallable<V>
```
abstract class MasterCallable<V>
extends Object
implements RetryingCallable<V>, Closeable
```
A RetryingCallable for master operations.

Field Summary

Fields
Modifier and Type Field and Description

protected HConnection connection

protected MasterKeepAliveConnection master

Fields
Modifier and Type	Field and Description
`protected HConnection`	`connection`
`protected MasterKeepAliveConnection`	`master`

Constructor Summary

Constructors
Constructor and Description

MasterCallable(HConnection connection)

Constructors
Constructor and Description
`MasterCallable(HConnection connection)`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`close()`
`String`	`getExceptionMessageAdditionalDetail()`
`void`	`prepare(boolean reload)` Prepare by setting up any connections to servers, etc., ahead of `RetryingCallable.call(int)` invocation.
`long`	`sleep(long pause, int tries)`
`void`	`throwable(Throwable t, boolean retrying)` Called when `RetryingCallable.call(int)` throws an exception and we are going to retry; take action to make it so we succeed on next call (clear caches, do relookup of locations, etc.).

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

Methods inherited from interface org.apache.hadoop.hbase.client.RetryingCallable
call

- Field Detail
  - connection
```
protected HConnection connection
```
  - master
```
protected MasterKeepAliveConnection master
```
- Constructor Detail
  - MasterCallable
```
public MasterCallable(HConnection connection)
```
- Method Detail
  - prepare
```
public void prepare(boolean reload)
             throws IOException
```
    Description copied from interface: RetryingCallable
    
    Prepare by setting up any connections to servers, etc., ahead of RetryingCallable.call(int) invocation.
    
    Specified by:
    
    prepare in interface RetryingCallable<V>
    
    Parameters:
    reload - Set this to true if need to requery locations
    
    Throws:
    
    IOException - e
  - close
```
public void close()
           throws IOException
```
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Throws:
    
    IOException
  - throwable
```
public void throwable(Throwable t,
             boolean retrying)
```
    Description copied from interface: RetryingCallable
    
    Called when RetryingCallable.call(int) throws an exception and we are going to retry; take action to make it so we succeed on next call (clear caches, do relookup of locations, etc.).
    
    Specified by:
    
    throwable in interface RetryingCallable<V>
    
    retrying - True if we are in retrying mode (we are not in retrying mode when max retries == 1; we ARE in retrying mode if retries > 1 even when we are the last attempt)
  - getExceptionMessageAdditionalDetail
```
public String getExceptionMessageAdditionalDetail()
```
    Specified by:
    
    getExceptionMessageAdditionalDetail in interface RetryingCallable<V>
    
    Returns:
    Some details from the implementation that we would like to add to a terminating exception; i.e. a fatal exception is being thrown ending retries and we might like to add more implementation-specific detail on to the exception being thrown.
  - sleep
```
public long sleep(long pause,
         int tries)
```
    Specified by:
    
    sleep in interface RetryingCallable<V>
    
    Returns:
    Suggestion on how much to sleep between retries

Class MasterCallable<V>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.apache.hadoop.hbase.client.RetryingCallable

Field Detail

connection

master

Constructor Detail

MasterCallable

Method Detail

prepare

close

throwable

getExceptionMessageAdditionalDetail

sleep