http://git-wip-us.apache.org/repos/asf/hbase-site/blob/a8725a46/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.Cluster.SwapRegionsAction.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.Cluster.SwapRegionsAction.html b/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.Cluster.SwapRegionsAction.html index 8fc3dbd..efdc708 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.Cluster.SwapRegionsAction.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.Cluster.SwapRegionsAction.html @@ -824,743 +824,747 @@ <span class="sourceLineNo">816</span> i++;<a name="line.816"></a> <span class="sourceLineNo">817</span> lowestLocalityServerIndex = serverIndicesSortedByLocality[i];<a name="line.817"></a> <span class="sourceLineNo">818</span> }<a name="line.818"></a> -<span class="sourceLineNo">819</span> LOG.debug("Lowest locality region server with non zero regions is "<a name="line.819"></a> -<span class="sourceLineNo">820</span> + servers[lowestLocalityServerIndex].getHostname() + " with locality "<a name="line.820"></a> -<span class="sourceLineNo">821</span> + localityPerServer[lowestLocalityServerIndex]);<a name="line.821"></a> -<span class="sourceLineNo">822</span> return lowestLocalityServerIndex;<a name="line.822"></a> -<span class="sourceLineNo">823</span> }<a name="line.823"></a> -<span class="sourceLineNo">824</span> }<a name="line.824"></a> -<span class="sourceLineNo">825</span><a name="line.825"></a> -<span class="sourceLineNo">826</span> int getLowestLocalityRegionOnServer(int serverIndex) {<a name="line.826"></a> -<span class="sourceLineNo">827</span> if (regionFinder != null) {<a name="line.827"></a> -<span class="sourceLineNo">828</span> float lowestLocality = 1.0f;<a name="line.828"></a> -<span 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distribution.getBlockLocalityIndex(servers[serverIndex].getHostname());<a name="line.838"></a> -<span class="sourceLineNo">839</span> if (locality < lowestLocality) {<a name="line.839"></a> -<span class="sourceLineNo">840</span> lowestLocality = locality;<a name="line.840"></a> -<span class="sourceLineNo">841</span> lowestLocalityRegionIndex = j;<a name="line.841"></a> -<span class="sourceLineNo">842</span> }<a name="line.842"></a> -<span class="sourceLineNo">843</span> }<a name="line.843"></a> -<span class="sourceLineNo">844</span> LOG.debug(" Lowest locality region index is " + lowestLocalityRegionIndex<a name="line.844"></a> -<span class="sourceLineNo">845</span> + " and its region server contains " + regionsPerServer[serverIndex].length<a name="line.845"></a> -<span class="sourceLineNo">846</span> + " regions");<a name="line.846"></a> -<span class="sourceLineNo">847</span> return regionsPerServer[serverIndex][lowestLocalityRegionIndex];<a name="line.847"></a> -<span class="sourceLineNo">848</span> } else {<a name="line.848"></a> -<span class="sourceLineNo">849</span> return -1;<a name="line.849"></a> -<span class="sourceLineNo">850</span> }<a name="line.850"></a> -<span class="sourceLineNo">851</span> }<a name="line.851"></a> -<span class="sourceLineNo">852</span><a name="line.852"></a> -<span class="sourceLineNo">853</span> float getLocalityOfRegion(int region, int server) {<a name="line.853"></a> -<span class="sourceLineNo">854</span> if (regionFinder != null) {<a name="line.854"></a> -<span class="sourceLineNo">855</span> HDFSBlocksDistribution distribution = regionFinder.getBlockDistribution(regions[region]);<a name="line.855"></a> -<span class="sourceLineNo">856</span> return distribution.getBlockLocalityIndex(servers[server].getHostname());<a name="line.856"></a> -<span class="sourceLineNo">857</span> } else {<a name="line.857"></a> -<span class="sourceLineNo">858</span> return 0f;<a name="line.858"></a> -<span 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class="sourceLineNo">826</span> }<a name="line.826"></a> +<span class="sourceLineNo">827</span><a name="line.827"></a> +<span class="sourceLineNo">828</span> int getLowestLocalityRegionOnServer(int serverIndex) {<a name="line.828"></a> +<span class="sourceLineNo">829</span> if (regionFinder != null) {<a name="line.829"></a> +<span class="sourceLineNo">830</span> float lowestLocality = 1.0f;<a name="line.830"></a> +<span class="sourceLineNo">831</span> int lowestLocalityRegionIndex = 0;<a name="line.831"></a> +<span class="sourceLineNo">832</span> if (regionsPerServer[serverIndex].length == 0) {<a name="line.832"></a> +<span class="sourceLineNo">833</span> // No regions on that region server<a name="line.833"></a> +<span class="sourceLineNo">834</span> return -1;<a name="line.834"></a> +<span class="sourceLineNo">835</span> }<a name="line.835"></a> +<span class="sourceLineNo">836</span> for (int j = 0; j < regionsPerServer[serverIndex].length; j++) {<a name="line.836"></a> +<span 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class="sourceLineNo">901</span> }<a name="line.901"></a> -<span class="sourceLineNo">902</span> localityPerServer[i] = distribution.getBlockLocalityIndex(servers[i].getHostname());<a name="line.902"></a> -<span class="sourceLineNo">903</span> }<a name="line.903"></a> -<span class="sourceLineNo">904</span> }<a name="line.904"></a> -<span class="sourceLineNo">905</span><a name="line.905"></a> -<span class="sourceLineNo">906</span> @VisibleForTesting<a name="line.906"></a> -<span class="sourceLineNo">907</span> protected void setNumRegions(int numRegions) {<a name="line.907"></a> -<span class="sourceLineNo">908</span> this.numRegions = numRegions;<a name="line.908"></a> -<span class="sourceLineNo">909</span> }<a name="line.909"></a> -<span class="sourceLineNo">910</span><a name="line.910"></a> -<span class="sourceLineNo">911</span> @VisibleForTesting<a name="line.911"></a> -<span class="sourceLineNo">912</span> protected void setNumMovedRegions(int numMovedRegions) {<a 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class="sourceLineNo">935</span> Arrays.toString(numMaxRegionsPerTable) +<a name="line.935"></a> -<span class="sourceLineNo">936</span> ", numRegions=" +<a name="line.936"></a> -<span class="sourceLineNo">937</span> numRegions +<a name="line.937"></a> -<span class="sourceLineNo">938</span> ", numServers=" +<a name="line.938"></a> -<span class="sourceLineNo">939</span> numServers +<a name="line.939"></a> -<span class="sourceLineNo">940</span> ", numTables=" +<a name="line.940"></a> -<span class="sourceLineNo">941</span> numTables +<a name="line.941"></a> -<span class="sourceLineNo">942</span> ", numMovedRegions=" +<a name="line.942"></a> -<span class="sourceLineNo">943</span> numMovedRegions +<a name="line.943"></a> -<span class="sourceLineNo">944</span> '}';<a name="line.944"></a> -<span class="sourceLineNo">945</span> return desc;<a name="line.945"></a> -<span class="sourceLineNo">946</span> }<a name="line.946"></a> -<span class="sourceLineNo">947</span> }<a name="line.947"></a> -<span 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name="line.967"></a> -<span class="sourceLineNo">968</span> protected ServerName masterServerName;<a name="line.968"></a> -<span class="sourceLineNo">969</span> protected MasterServices services;<a name="line.969"></a> -<span class="sourceLineNo">970</span><a name="line.970"></a> -<span class="sourceLineNo">971</span> /**<a name="line.971"></a> -<span class="sourceLineNo">972</span> * By default, regions of some small system tables such as meta,<a name="line.972"></a> -<span class="sourceLineNo">973</span> * namespace, and acl are assigned to the active master. 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// for logging<a name="line.1134"></a> +<span class="sourceLineNo">1135</span> int floor = (int) Math.floor(average * (1 - slop));<a name="line.1135"></a> +<span class="sourceLineNo">1136</span> int ceiling = (int) Math.ceil(average * (1 + slop));<a name="line.1136"></a> +<span class="sourceLineNo">1137</span> if (!(cs.getMaxLoad() > ceiling || cs.getMinLoad() < floor)) {<a name="line.1137"></a> +<span class="sourceLineNo">1138</span> NavigableMap<ServerAndLoad, List<HRegionInfo>> serversByLoad = cs.getServersByLoad();<a name="line.1138"></a> +<span class="sourceLineNo">1139</span> if (LOG.isTraceEnabled()) {<a name="line.1139"></a> +<span class="sourceLineNo">1140</span> // If nothing to balance, then don't say anything unless trace-level logging.<a name="line.1140"></a> +<span class="sourceLineNo">1141</span> LOG.trace("Skipping load balancing because balanced cluster; " +<a name="line.1141"></a> +<span class="sourceLineNo">1142</span> "servers=" + cs.getNumServers() +<a name="line.1142"></a> +<span class="sourceLineNo">1143</span> " regions=" + cs.getNumRegions() + " average=" + average +<a name="line.1143"></a> +<span class="sourceLineNo">1144</span> " mostloaded=" + serversByLoad.lastKey().getLoad() +<a name="line.1144"></a> +<span class="sourceLineNo">1145</span> " leastloaded=" + serversByLoad.firstKey().getLoad());<a name="line.1145"></a> +<span class="sourceLineNo">1146</span> }<a name="line.1146"></a> +<span class="sourceLineNo">1147</span> return false;<a name="line.1147"></a> +<span class="sourceLineNo">1148</span> }<a name="line.1148"></a> +<span class="sourceLineNo">1149</span> return true;<a name="line.1149"></a> +<span class="sourceLineNo">1150</span> }<a name="line.1150"></a> +<span class="sourceLineNo">1151</span><a name="line.1151"></a> +<span class="sourceLineNo">1152</span> /**<a name="line.1152"></a> +<span class="sourceLineNo">1153</span> * Subclasses should implement this to return true if the cluster has nodes that hosts<a name="line.1153"></a> +<span class="sourceLineNo">1154</span> * multiple replicas for the same region, or, if there are multiple racks and the same<a name="line.1154"></a> +<span class="sourceLineNo">1155</span> * rack hosts replicas of the same region<a name="line.1155"></a> +<span class="sourceLineNo">1156</span> * @param c Cluster information<a name="line.1156"></a> +<span class="sourceLineNo">1157</span> * @return whether region replicas are currently co-located<a name="line.1157"></a> +<span class="sourceLineNo">1158</span> */<a name="line.1158"></a> +<span class="sourceLineNo">1159</span> protected boolean areSomeRegionReplicasColocated(Cluster c) {<a name="line.1159"></a> +<span class="sourceLineNo">1160</span> return false;<a name="line.1160"></a> +<span class="sourceLineNo">1161</span> }<a name="line.1161"></a> +<span class="sourceLineNo">1162</span><a name="line.1162"></a> +<span class="sourceLineNo">1163</span> /**<a name="line.1163"></a> +<span class="sourceLineNo">1164</span> * Generates a bulk assignment plan to be used on cluster startup using a<a name="line.1164"></a> +<span class="sourceLineNo">1165</span> * simple round-robin assignment.<a name="line.1165"></a> +<span class="sourceLineNo">1166</span> * <p><a name="line.1166"></a> +<span class="sourceLineNo">1167</span> * Takes a list of all the regions and all the servers in the cluster and<a name="line.1167"></a> +<span class="sourceLineNo">1168</span> * returns a map of each server to the regions that it should be assigned.<a name="line.1168"></a> +<span class="sourceLineNo">1169</span> * <p><a name="line.1169"></a> +<span class="sourceLineNo">1170</span> * Currently implemented as a round-robin assignment. Same invariant as load<a name="line.1170"></a> +<span class="sourceLineNo">1171</span> * balancing, all servers holding floor(avg) or ceiling(avg).<a name="line.1171"></a> +<span class="sourceLineNo">1172</span> *<a name="line.1172"></a> +<span class="sourceLineNo">1173</span> * TODO: Use block locations from HDFS to place regions with their blocks<a name="line.1173"></a> +<span class="sourceLineNo">1174</span> *<a name="line.1174"></a> +<span class="sourceLineNo">1175</span> * @param regions all regions<a name="line.1175"></a> +<span class="sourceLineNo">1176</span> * @param servers all servers<a name="line.1176"></a> +<span class="sourceLineNo">1177</span> * @return map of server to the regions it should take, or null if no<a name="line.1177"></a> +<span class="sourceLineNo">1178</span> * assignment is possible (ie. no regions or no servers)<a name="line.1178"></a> +<span class="sourceLineNo">1179</span> */<a name="line.1179"></a> +<span class="sourceLineNo">1180</span> @Override<a name="line.1180"></a> +<span class="sourceLineNo">1181</span> public Map<ServerName, List<HRegionInfo>> roundRobinAssignment(List<HRegionInfo> regions,<a name="line.1181"></a> +<span class="sourceLineNo">1182</span> List<ServerName> servers) {<a name="line.1182"></a> +<span class="sourceLineNo">1183</span> metricsBalancer.incrMiscInvocations();<a name="line.1183"></a> +<span class="sourceLineNo">1184</span> Map<ServerName, List<HRegionInfo>> assignments = assignMasterRegions(regions, servers);<a name="line.1184"></a> +<span class="sourceLineNo">1185</span> if (assignments != null && !assignments.isEmpty()) {<a name="line.1185"></a> +<span class="sourceLineNo">1186</span> servers = new ArrayList<ServerName>(servers);<a name="line.1186"></a> +<span class="sourceLineNo">1187</span> // Guarantee not to put other regions on master<a name="line.1187"></a> +<span class="sourceLineNo">1188</span> servers.remove(masterServerName);<a name="line.1188"></a> +<span class="sourceLineNo">1189</span> List<HRegionInfo> masterRegions = assignments.get(masterServerName);<a name="line.1189"></a> +<span class="sourceLineNo">1190</span> if (!masterRegions.isEmpty()) {<a name="line.1190"></a> +<span class="sourceLineNo">1191</span> regions = new ArrayList<HRegionInfo>(regions);<a name="line.1191"></a> +<span class="sourceLineNo">1192</span> for (HRegionInfo region: masterRegions) {<a name="line.1192"></a> +<span class="sourceLineNo">1193</span> regions.remove(region);<a name="line.1193"></a> +<span class="sourceLineNo">1194</span> }<a name="line.1194"></a> +<span class="sourceLineNo">1195</span> }<a name="line.1195"></a> +<span class="sourceLineNo">1196</span> }<a name="line.1196"></a> +<span class="sourceLineNo">1197</span> if (regions == null || regions.isEmpty()) {<a name="line.1197"></a> +<span class="sourceLineNo">1198</span> return assignments;<a name="line.1198"></a> +<span class="sourceLineNo">1199</span> }<a name="line.1199"></a> +<span class="sourceLineNo">1200</span><a name="line.1200"></a> +<span class="sourceLineNo">1201</span> int numServers = servers == null ? 0 : servers.size();<a name="line.1201"></a> +<span class="sourceLineNo">1202</span> if (numServers == 0) {<a name="line.1202"></a> +<span class="sourceLineNo">1203</span> LOG.warn("Wanted to do round robin assignment but no servers to assign to");<a name="line.1203"></a> +<span class="sourceLineNo">1204</span> return null;<a name="line.1204"></a> +<span class="sourceLineNo">1205</span> }<a name="line.1205"></a> +<span class="sourceLineNo">1206</span><a name="line.1206"></a> +<span class="sourceLineNo">1207</span> // TODO: instead of retainAssignment() and roundRobinAssignment(), we should just run the<a name="line.1207"></a> +<span class="sourceLineNo">1208</span> // normal LB.balancerCluster() with unassignedRegions. 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This should also run fast with fewer number of iterations.<a name="line.1210"></a> +<span class="sourceLineNo">1211</span><a name="line.1211"></a> +<span class="sourceLineNo">1212</span> if (numServers == 1) { // Only one server, nothing fancy we can do here<a name="line.1212"></a> +<span class="sourceLineNo">1213</span> ServerName server = servers.get(0);<a name="line.1213"></a> +<span class="sourceLineNo">1214</span> assignments.put(server, new ArrayList<HRegionInfo>(regions));<a name="line.1214"></a> +<span class="sourceLineNo">1215</span> return assignments;<a name="line.1215"></a> +<span class="sourceLineNo">1216</span> }<a name="line.1216"></a> +<span class="sourceLineNo">1217</span><a name="line.1217"></a> +<span class="sourceLineNo">1218</span> Cluster cluster = createCluster(servers, regions);<a name="line.1218"></a> +<span class="sourceLineNo">1219</span> List<HRegionInfo> unassignedRegions = new ArrayList<HRegionInfo>();<a name="line.1219"></a> +<span class="sourceLineNo">1220</span><a name="line.1220"></a> +<span class="sourceLineNo">1221</span> roundRobinAssignment(cluster, regions, unassignedRegions,<a name="line.1221"></a> +<span class="sourceLineNo">1222</span> servers, assignments);<a name="line.1222"></a> +<span class="sourceLineNo">1223</span><a name="line.1223"></a> +<span class="sourceLineNo">1224</span> List<HRegionInfo> lastFewRegions = new ArrayList<HRegionInfo>();<a name="line.1224"></a> +<span class="sourceLineNo">1225</span> // assign the remaining by going through the list and try to assign to servers one-by-one<a name="line.1225"></a> +<span class="sourceLineNo">1226</span> int serverIdx = RANDOM.nextInt(numServers);<a name="line.1226"></a> +<span class="sourceLineNo">1227</span> for (HRegionInfo region : unassignedRegions) {<a name="line.1227"></a> +<span class="sourceLineNo">1228</span> boolean assigned = false;<a name="line.1228"></a> +<span class="sourceLineNo">1229</span> for (int j = 0; j < numServers; j++) { // try all servers one by one<a name="line.1229"></a> +<span class="sourceLineNo">1230</span> ServerName serverName = servers.get((j + serverIdx) % numServers);<a name="line.1230"></a> +<span class="sourceLineNo">1231</span> if (!cluster.wouldLowerAvailability(region, serverName)) {<a name="line.1231"></a> +<span class="sourceLineNo">1232</span> List<HRegionInfo> serverRegions = assignments.get(serverName);<a name="line.1232"></a> +<span class="sourceLineNo">1233</span> if (serverRegions == null) {<a name="line.1233"></a> +<span class="sourceLineNo">1234</span> serverRegions = new ArrayList<HRegionInfo>();<a name="line.1234"></a> +<span class="sourceLineNo">1235</span> assignments.put(serverName, serverRegions);<a name="line.1235"></a> +<span class="sourceLineNo">1236</span> }<a name="line.1236"></a> +<span class="sourceLineNo">1237</span> serverRegions.add(region);<a name="line.1237"></a> +<span class="sourceLineNo">1238</span> cluster.doAssignRegion(region, serverName);<a name="line.1238"></a> +<span class="sourceLineNo">1239</span> serverIdx = (j + serverIdx + 1) % numServers; //remain from next server<a name="line.1239"></a> +<span class="sourceLineNo">1240</span> assigned = true;<a name="line.1240"></a> +<span class="sourceLineNo">1241</span> break;<a name="line.
<TRUNCATED>
