MasterAnnotationReadingPriorityFunction (Apache HBase 1.2.12 API)

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java.lang.Object
- org.apache.hadoop.hbase.regionserver.AnnotationReadingPriorityFunction
- - org.apache.hadoop.hbase.master.MasterAnnotationReadingPriorityFunction

All Implemented Interfaces:

PriorityFunction
```
public class MasterAnnotationReadingPriorityFunction
extends AnnotationReadingPriorityFunction
```
Priority function specifically for the master. This doesn't make the super users always priority since that would make everything to the master into high priority. Specifically when reporting that a region is in transition master will try and edit the meta table. That edit will block the thread until successful. However if at the same time meta is also moving then we need to ensure that the regular region that's moving isn't blocking processing of the request to online meta. To accomplish this this priority function makes sure that all requests to transition meta are handled in different threads from other report region in transition calls.

Field Summary
- Fields inherited from class org.apache.hadoop.hbase.regionserver.AnnotationReadingPriorityFunction
  annotatedQos, SCAN_VTIME_WEIGHT_CONF_KEY

Constructor Summary

Constructors
Constructor and Description
`MasterAnnotationReadingPriorityFunction(RSRpcServices rpcServices)`
`MasterAnnotationReadingPriorityFunction(RSRpcServices rpcServices, Class<? extends RSRpcServices> clz)`

Method Summary

Methods
Modifier and Type	Method and Description
`int`	`getPriority(org.apache.hadoop.hbase.protobuf.generated.RPCProtos.RequestHeader header, com.google.protobuf.Message param, User user)` Returns a 'priority' based on the request type.

Methods inherited from class org.apache.hadoop.hbase.regionserver.AnnotationReadingPriorityFunction
getAnnotatedPriority, getBasePriority, getDeadline

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

- Constructor Detail
  - MasterAnnotationReadingPriorityFunction
```
public MasterAnnotationReadingPriorityFunction(RSRpcServices rpcServices)
```
  - MasterAnnotationReadingPriorityFunction
```
public MasterAnnotationReadingPriorityFunction(RSRpcServices rpcServices,
                                       Class<? extends RSRpcServices> clz)
```
- Method Detail
  - getPriority
```
public int getPriority(org.apache.hadoop.hbase.protobuf.generated.RPCProtos.RequestHeader header,
              com.google.protobuf.Message param,
              User user)
```
    Description copied from class: AnnotationReadingPriorityFunction
    
    Returns a 'priority' based on the request type. Currently the returned priority is used for queue selection. See the SimpleRpcScheduler as example. It maintains a queue per 'priory type' HIGH_QOS (meta requests), REPLICATION_QOS (replication requests), NORMAL_QOS (user requests).
    
    Specified by:
    
    getPriority in interface PriorityFunction
    
    Overrides:
    
    getPriority in class AnnotationReadingPriorityFunction
    
    Returns:
    Priority of this request.

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