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18 package org.apache.hadoop.hbase.regionserver;
19
20 import java.lang.reflect.Method;
21 import java.util.HashMap;
22 import java.util.Map;
23
24 import org.apache.commons.logging.Log;
25 import org.apache.commons.logging.LogFactory;
26 import org.apache.hadoop.hbase.HConstants;
27 import org.apache.hadoop.hbase.NotServingRegionException;
28 import org.apache.hadoop.hbase.ipc.PriorityFunction;
29 import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.CloseRegionRequest;
30 import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.CompactRegionRequest;
31 import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.FlushRegionRequest;
32 import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.GetRegionInfoRequest;
33 import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.GetStoreFileRequest;
34 import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.SplitRegionRequest;
35 import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.GetRequest;
36 import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.MultiRequest;
37 import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.MutateRequest;
38 import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.ScanRequest;
39 import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionSpecifier;
40 import org.apache.hadoop.hbase.protobuf.generated.RPCProtos.RequestHeader;
41 import org.apache.hadoop.hbase.regionserver.HRegionServer.QosPriority;
42
43 import com.google.common.annotations.VisibleForTesting;
44 import com.google.protobuf.Message;
45 import com.google.protobuf.TextFormat;
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69 class AnnotationReadingPriorityFunction implements PriorityFunction {
70 public static final Log LOG =
71 LogFactory.getLog(AnnotationReadingPriorityFunction.class.getName());
72 private final Map<String, Integer> annotatedQos;
73
74
75 private HRegionServer hRegionServer;
76 @SuppressWarnings("unchecked")
77 private final Class<? extends Message>[] knownArgumentClasses = new Class[]{
78 GetRegionInfoRequest.class,
79 GetStoreFileRequest.class,
80 CloseRegionRequest.class,
81 FlushRegionRequest.class,
82 SplitRegionRequest.class,
83 CompactRegionRequest.class,
84 GetRequest.class,
85 MutateRequest.class,
86 ScanRequest.class
87 };
88
89
90 private final Map<String, Class<? extends Message>> argumentToClassMap =
91 new HashMap<String, Class<? extends Message>>();
92 private final Map<String, Map<Class<? extends Message>, Method>> methodMap =
93 new HashMap<String, Map<Class<? extends Message>, Method>>();
94
95 AnnotationReadingPriorityFunction(final HRegionServer hrs) {
96 this.hRegionServer = hrs;
97 Map<String, Integer> qosMap = new HashMap<String, Integer>();
98 for (Method m : HRegionServer.class.getMethods()) {
99 QosPriority p = m.getAnnotation(QosPriority.class);
100 if (p != null) {
101
102
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104
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106 String capitalizedMethodName = capitalize(m.getName());
107 qosMap.put(capitalizedMethodName, p.priority());
108 }
109 }
110 this.annotatedQos = qosMap;
111 if (methodMap.get("getRegion") == null) {
112 methodMap.put("hasRegion", new HashMap<Class<? extends Message>, Method>());
113 methodMap.put("getRegion", new HashMap<Class<? extends Message>, Method>());
114 }
115 for (Class<? extends Message> cls : knownArgumentClasses) {
116 argumentToClassMap.put(cls.getName(), cls);
117 try {
118 methodMap.get("hasRegion").put(cls, cls.getDeclaredMethod("hasRegion"));
119 methodMap.get("getRegion").put(cls, cls.getDeclaredMethod("getRegion"));
120 } catch (Exception e) {
121 throw new RuntimeException(e);
122 }
123 }
124 }
125
126 private String capitalize(final String s) {
127 StringBuilder strBuilder = new StringBuilder(s);
128 strBuilder.setCharAt(0, Character.toUpperCase(strBuilder.charAt(0)));
129 return strBuilder.toString();
130 }
131
132 public boolean isMetaRegion(byte[] regionName) {
133 HRegion region;
134 try {
135 region = hRegionServer.getRegion(regionName);
136 } catch (NotServingRegionException ignored) {
137 return false;
138 }
139 return region.getRegionInfo().isMetaTable();
140 }
141
142 @Override
143 public int getPriority(RequestHeader header, Message param) {
144 String methodName = header.getMethodName();
145 Integer priorityByAnnotation = annotatedQos.get(methodName);
146 if (priorityByAnnotation != null) {
147 return priorityByAnnotation;
148 }
149 if (param == null) {
150 return HConstants.NORMAL_QOS;
151 }
152 if (methodName.equalsIgnoreCase("multi") && param instanceof MultiRequest) {
153
154
155 return header.hasPriority()? header.getPriority(): HConstants.NORMAL_QOS;
156 }
157 String cls = param.getClass().getName();
158 Class<? extends Message> rpcArgClass = argumentToClassMap.get(cls);
159 RegionSpecifier regionSpecifier = null;
160
161 try {
162
163
164
165
166 Method hasRegion = methodMap.get("hasRegion").get(rpcArgClass);
167 if (hasRegion != null && (Boolean)hasRegion.invoke(param, (Object[])null)) {
168 Method getRegion = methodMap.get("getRegion").get(rpcArgClass);
169 regionSpecifier = (RegionSpecifier)getRegion.invoke(param, (Object[])null);
170 HRegion region = hRegionServer.getRegion(regionSpecifier);
171 if (region.getRegionInfo().isMetaTable()) {
172 if (LOG.isTraceEnabled()) {
173 LOG.trace("High priority because region=" + region.getRegionNameAsString());
174 }
175 return HConstants.HIGH_QOS;
176 }
177 }
178 } catch (Exception ex) {
179
180
181 if (LOG.isTraceEnabled()) LOG.trace("Marking normal priority after getting exception=" + ex);
182 return HConstants.NORMAL_QOS;
183 }
184
185 if (methodName.equalsIgnoreCase("scan")) {
186 ScanRequest request = (ScanRequest)param;
187 if (!request.hasScannerId()) {
188 return HConstants.NORMAL_QOS;
189 }
190 RegionScanner scanner = hRegionServer.getScanner(request.getScannerId());
191 if (scanner != null && scanner.getRegionInfo().isMetaRegion()) {
192 if (LOG.isTraceEnabled()) {
193
194 LOG.trace("High priority scanner request " + TextFormat.shortDebugString(request));
195 }
196 return HConstants.HIGH_QOS;
197 }
198 }
199 return HConstants.NORMAL_QOS;
200 }
201
202 @VisibleForTesting
203 void setRegionServer(final HRegionServer hrs) {
204 this.hRegionServer = hrs;
205 }
206 }