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Main functionality for HBase
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.regionserver;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.ipc.PriorityFunction;
import org.apache.hadoop.hbase.ipc.QosPriority;
import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.CloseRegionRequest;
import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.CompactRegionRequest;
import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.FlushRegionRequest;
import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.GetRegionInfoRequest;
import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.GetStoreFileRequest;
import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.SplitRegionRequest;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.GetRequest;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.MutateRequest;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.ScanRequest;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionSpecifier;
import org.apache.hadoop.hbase.protobuf.generated.RPCProtos.RequestHeader;
import com.google.common.annotations.VisibleForTesting;
import com.google.protobuf.Message;
import com.google.protobuf.TextFormat;
import org.apache.hadoop.hbase.security.User;
/**
* Reads special method annotations and table names to figure a priority for use by QoS facility in
* ipc; e.g: rpcs to hbase:meta get priority.
*/
// TODO: Remove. This is doing way too much work just to figure a priority. Do as Elliott
// suggests and just have the client specify a priority.
//The logic for figuring out high priority RPCs is as follows:
//1. if the method is annotated with a QosPriority of QOS_HIGH,
// that is honored
//2. parse out the protobuf message and see if the request is for meta
// region, and if so, treat it as a high priority RPC
//Some optimizations for (2) are done here -
//Clients send the argument classname as part of making the RPC. The server
//decides whether to deserialize the proto argument message based on the
//pre-established set of argument classes (knownArgumentClasses below).
//This prevents the server from having to deserialize all proto argument
//messages prematurely.
//All the argument classes declare a 'getRegion' method that returns a
//RegionSpecifier object. Methods can be invoked on the returned object
//to figure out whether it is a meta region or not.
@InterfaceAudience.Private
public class AnnotationReadingPriorityFunction implements PriorityFunction {
private static final Log LOG =
LogFactory.getLog(AnnotationReadingPriorityFunction.class.getName());
/** Used to control the scan delay, currently sqrt(numNextCall * weight) */
public static final String SCAN_VTIME_WEIGHT_CONF_KEY = "hbase.ipc.server.scan.vtime.weight";
protected final Map annotatedQos;
//We need to mock the regionserver instance for some unit tests (set via
//setRegionServer method.
private RSRpcServices rpcServices;
@SuppressWarnings("unchecked")
private final Class[] knownArgumentClasses = new Class[]{
GetRegionInfoRequest.class,
GetStoreFileRequest.class,
CloseRegionRequest.class,
FlushRegionRequest.class,
SplitRegionRequest.class,
CompactRegionRequest.class,
GetRequest.class,
MutateRequest.class,
ScanRequest.class
};
// Some caches for helping performance
private final Map> argumentToClassMap =
new HashMap>();
private final Map, Method>> methodMap =
new HashMap, Method>>();
private final float scanVirtualTimeWeight;
/**
* Calls {@link #AnnotationReadingPriorityFunction(RSRpcServices, Class)} using the result of
* {@code rpcServices#getClass()}
*
* @param rpcServices
* The RPC server implementation
*/
public AnnotationReadingPriorityFunction(final RSRpcServices rpcServices) {
this(rpcServices, rpcServices.getClass());
}
/**
* Constructs the priority function given the RPC server implementation and the annotations on the
* methods in the provided {@code clz}.
*
* @param rpcServices
* The RPC server implementation
* @param clz
* The concrete RPC server implementation's class
*/
public AnnotationReadingPriorityFunction(final RSRpcServices rpcServices,
Class clz) {
Map qosMap = new HashMap();
for (Method m : clz.getMethods()) {
QosPriority p = m.getAnnotation(QosPriority.class);
if (p != null) {
// Since we protobuf'd, and then subsequently, when we went with pb style, method names
// are capitalized. This meant that this brittle compare of method names gotten by
// reflection no longer matched the method names coming in over pb. TODO: Get rid of this
// check. For now, workaround is to capitalize the names we got from reflection so they
// have chance of matching the pb ones.
String capitalizedMethodName = capitalize(m.getName());
qosMap.put(capitalizedMethodName, p.priority());
}
}
this.rpcServices = rpcServices;
this.annotatedQos = qosMap;
if (methodMap.get("getRegion") == null) {
methodMap.put("hasRegion", new HashMap, Method>());
methodMap.put("getRegion", new HashMap, Method>());
}
for (Class cls : knownArgumentClasses) {
argumentToClassMap.put(cls.getName(), cls);
try {
methodMap.get("hasRegion").put(cls, cls.getDeclaredMethod("hasRegion"));
methodMap.get("getRegion").put(cls, cls.getDeclaredMethod("getRegion"));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
Configuration conf = rpcServices.getConfiguration();
scanVirtualTimeWeight = conf.getFloat(SCAN_VTIME_WEIGHT_CONF_KEY, 1.0f);
}
private String capitalize(final String s) {
StringBuilder strBuilder = new StringBuilder(s);
strBuilder.setCharAt(0, Character.toUpperCase(strBuilder.charAt(0)));
return strBuilder.toString();
}
/**
* 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).
*/
@Override
public int getPriority(RequestHeader header, Message param, User user) {
int priorityByAnnotation = getAnnotatedPriority(header);
if (priorityByAnnotation >= 0) {
return priorityByAnnotation;
}
return getBasePriority(header, param);
}
/**
* See if the method has an annotation.
* @param header
* @return Return the priority from the annotation. If there isn't
* an annotation, this returns something below zero.
*/
protected int getAnnotatedPriority(RequestHeader header) {
String methodName = header.getMethodName();
Integer priorityByAnnotation = annotatedQos.get(methodName);
if (priorityByAnnotation != null) {
return priorityByAnnotation;
}
return -1;
}
/**
* Get the priority for a given request from the header and the param
* This doesn't consider which user is sending the request at all.
* This doesn't consider annotations
*/
protected int getBasePriority(RequestHeader header, Message param) {
if (param == null) {
return HConstants.NORMAL_QOS;
}
// Trust the client-set priorities if set
if (header.hasPriority()) {
return header.getPriority();
}
String cls = param.getClass().getName();
Class rpcArgClass = argumentToClassMap.get(cls);
RegionSpecifier regionSpecifier = null;
//check whether the request has reference to meta region or now.
try {
// Check if the param has a region specifier; the pb methods are hasRegion and getRegion if
// hasRegion returns true. Not all listed methods have region specifier each time. For
// example, the ScanRequest has it on setup but thereafter relies on the scannerid rather than
// send the region over every time.
Method hasRegion = methodMap.get("hasRegion").get(rpcArgClass);
if (hasRegion != null && (Boolean)hasRegion.invoke(param, (Object[])null)) {
Method getRegion = methodMap.get("getRegion").get(rpcArgClass);
regionSpecifier = (RegionSpecifier)getRegion.invoke(param, (Object[])null);
Region region = rpcServices.getRegion(regionSpecifier);
if (region.getRegionInfo().isSystemTable()) {
if (LOG.isTraceEnabled()) {
LOG.trace("High priority because region=" +
region.getRegionInfo().getRegionNameAsString());
}
return HConstants.SYSTEMTABLE_QOS;
}
}
} catch (Exception ex) {
// Not good throwing an exception out of here, a runtime anyways. Let the query go into the
// server and have it throw the exception if still an issue. Just mark it normal priority.
if (LOG.isTraceEnabled()) LOG.trace("Marking normal priority after getting exception=" + ex);
return HConstants.NORMAL_QOS;
}
if (param instanceof ScanRequest) { // scanner methods...
ScanRequest request = (ScanRequest)param;
if (!request.hasScannerId()) {
return HConstants.NORMAL_QOS;
}
RegionScanner scanner = rpcServices.getScanner(request.getScannerId());
if (scanner != null && scanner.getRegionInfo().isSystemTable()) {
if (LOG.isTraceEnabled()) {
// Scanner requests are small in size so TextFormat version should not overwhelm log.
LOG.trace("High priority scanner request " + TextFormat.shortDebugString(request));
}
return HConstants.SYSTEMTABLE_QOS;
}
}
return HConstants.NORMAL_QOS;
}
/**
* Based on the request content, returns the deadline of the request.
*
* @param header
* @param param
* @return Deadline of this request. 0 now, otherwise msec of 'delay'
*/
@Override
public long getDeadline(RequestHeader header, Message param) {
if (param instanceof ScanRequest) {
ScanRequest request = (ScanRequest)param;
if (!request.hasScannerId()) {
return 0;
}
// get the 'virtual time' of the scanner, and applies sqrt() to get a
// nice curve for the delay. More a scanner is used the less priority it gets.
// The weight is used to have more control on the delay.
long vtime = rpcServices.getScannerVirtualTime(request.getScannerId());
return Math.round(Math.sqrt(vtime * scanVirtualTimeWeight));
}
return 0;
}
@VisibleForTesting
void setRegionServer(final HRegionServer hrs) {
this.rpcServices = hrs.getRSRpcServices();
}
}