Package org.apache.hadoop.hbase.master

Class MasterAnnotationReadingPriorityFunction

java.lang.Object

org.apache.hadoop.hbase.regionserver.AnnotationReadingPriorityFunction

org.apache.hadoop.hbase.master.MasterAnnotationReadingPriorityFunction

All Implemented Interfaces:

PriorityFunction

@Private
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. After HBASE-21754, ReportRegionStateTransitionRequest for meta region will be assigned a META_QOS , a separate executor called metaTransitionExecutor will execute it. Other transition request will be executed in priorityExecutor to prevent being mixed with normal requests

Field Summary

Fields

Modifier and Type	Field	Description
static final int	META_TRANSITION_QOS

Fields inherited from class org.apache.hadoop.hbase.regionserver.AnnotationReadingPriorityFunction

annotatedQos, SCAN_VTIME_WEIGHT_CONF_KEY

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
int	getPriority(org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.RequestHeader header, org.apache.hbase.thirdparty.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

Field Details

META_TRANSITION_QOS

public static final int META_TRANSITION_QOS

See Also:

• Constant Field Values

Constructor Details

MasterAnnotationReadingPriorityFunction

public MasterAnnotationReadingPriorityFunction(RSRpcServices rpcServices)

MasterAnnotationReadingPriorityFunction

public MasterAnnotationReadingPriorityFunction(RSRpcServices rpcServices,
 Class<? extends RSRpcServices> clz)

Method Details

getPriority

public int getPriority(org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.RequestHeader header,
 org.apache.hbase.thirdparty.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.