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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.quotas;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.util.Arrays;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.List;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.hadoop.conf.Configuration;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.hbase.client.Mutation;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.client.Result;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.ipc.RpcCall;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.ipc.RpcServer;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.yetus.audience.InterfaceStability;</span> |
| <span class="source-line-no">029</span><span id="line-29"></span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos;</span> |
| <span class="source-line-no">031</span><span id="line-31"></span> |
| <span class="source-line-no">032</span><span id="line-32">@InterfaceAudience.Private</span> |
| <span class="source-line-no">033</span><span id="line-33">@InterfaceStability.Evolving</span> |
| <span class="source-line-no">034</span><span id="line-34">public class DefaultOperationQuota implements OperationQuota {</span> |
| <span class="source-line-no">035</span><span id="line-35"></span> |
| <span class="source-line-no">036</span><span id="line-36"> // a single scan estimate can consume no more than this proportion of the limiter's limit</span> |
| <span class="source-line-no">037</span><span id="line-37"> // this prevents a long-running scan from being estimated at, say, 100MB of IO against</span> |
| <span class="source-line-no">038</span><span id="line-38"> // a <100MB/IO throttle (because this would never succeed)</span> |
| <span class="source-line-no">039</span><span id="line-39"> private static final double MAX_SCAN_ESTIMATE_PROPORTIONAL_LIMIT_CONSUMPTION = 0.9;</span> |
| <span class="source-line-no">040</span><span id="line-40"></span> |
| <span class="source-line-no">041</span><span id="line-41"> protected final List<QuotaLimiter> limiters;</span> |
| <span class="source-line-no">042</span><span id="line-42"> private final long writeCapacityUnit;</span> |
| <span class="source-line-no">043</span><span id="line-43"> private final long readCapacityUnit;</span> |
| <span class="source-line-no">044</span><span id="line-44"></span> |
| <span class="source-line-no">045</span><span id="line-45"> // the available read/write quota size in bytes</span> |
| <span class="source-line-no">046</span><span id="line-46"> protected long readAvailable = 0;</span> |
| <span class="source-line-no">047</span><span id="line-47"> // estimated quota</span> |
| <span class="source-line-no">048</span><span id="line-48"> protected long writeConsumed = 0;</span> |
| <span class="source-line-no">049</span><span id="line-49"> protected long readConsumed = 0;</span> |
| <span class="source-line-no">050</span><span id="line-50"> protected long writeCapacityUnitConsumed = 0;</span> |
| <span class="source-line-no">051</span><span id="line-51"> protected long readCapacityUnitConsumed = 0;</span> |
| <span class="source-line-no">052</span><span id="line-52"> // real consumed quota</span> |
| <span class="source-line-no">053</span><span id="line-53"> private final long[] operationSize;</span> |
| <span class="source-line-no">054</span><span id="line-54"> // difference between estimated quota and real consumed quota used in close method</span> |
| <span class="source-line-no">055</span><span id="line-55"> // to adjust quota amount. Also used by ExceedOperationQuota which is a subclass</span> |
| <span class="source-line-no">056</span><span id="line-56"> // of DefaultOperationQuota</span> |
| <span class="source-line-no">057</span><span id="line-57"> protected long writeDiff = 0;</span> |
| <span class="source-line-no">058</span><span id="line-58"> protected long readDiff = 0;</span> |
| <span class="source-line-no">059</span><span id="line-59"> protected long writeCapacityUnitDiff = 0;</span> |
| <span class="source-line-no">060</span><span id="line-60"> protected long readCapacityUnitDiff = 0;</span> |
| <span class="source-line-no">061</span><span id="line-61"> private boolean useResultSizeBytes;</span> |
| <span class="source-line-no">062</span><span id="line-62"> private long blockSizeBytes;</span> |
| <span class="source-line-no">063</span><span id="line-63"> private long maxScanEstimate;</span> |
| <span class="source-line-no">064</span><span id="line-64"></span> |
| <span class="source-line-no">065</span><span id="line-65"> public DefaultOperationQuota(final Configuration conf, final int blockSizeBytes,</span> |
| <span class="source-line-no">066</span><span id="line-66"> final QuotaLimiter... limiters) {</span> |
| <span class="source-line-no">067</span><span id="line-67"> this(conf, Arrays.asList(limiters));</span> |
| <span class="source-line-no">068</span><span id="line-68"> this.useResultSizeBytes =</span> |
| <span class="source-line-no">069</span><span id="line-69"> conf.getBoolean(OperationQuota.USE_RESULT_SIZE_BYTES, USE_RESULT_SIZE_BYTES_DEFAULT);</span> |
| <span class="source-line-no">070</span><span id="line-70"> this.blockSizeBytes = blockSizeBytes;</span> |
| <span class="source-line-no">071</span><span id="line-71"> long readSizeLimit =</span> |
| <span class="source-line-no">072</span><span id="line-72"> Arrays.stream(limiters).mapToLong(QuotaLimiter::getReadLimit).min().orElse(Long.MAX_VALUE);</span> |
| <span class="source-line-no">073</span><span id="line-73"> maxScanEstimate = Math.round(MAX_SCAN_ESTIMATE_PROPORTIONAL_LIMIT_CONSUMPTION * readSizeLimit);</span> |
| <span class="source-line-no">074</span><span id="line-74"> }</span> |
| <span class="source-line-no">075</span><span id="line-75"></span> |
| <span class="source-line-no">076</span><span id="line-76"> /**</span> |
| <span class="source-line-no">077</span><span id="line-77"> * NOTE: The order matters. It should be something like [user, table, namespace, global]</span> |
| <span class="source-line-no">078</span><span id="line-78"> */</span> |
| <span class="source-line-no">079</span><span id="line-79"> public DefaultOperationQuota(final Configuration conf, final List<QuotaLimiter> limiters) {</span> |
| <span class="source-line-no">080</span><span id="line-80"> this.writeCapacityUnit =</span> |
| <span class="source-line-no">081</span><span id="line-81"> conf.getLong(QuotaUtil.WRITE_CAPACITY_UNIT_CONF_KEY, QuotaUtil.DEFAULT_WRITE_CAPACITY_UNIT);</span> |
| <span class="source-line-no">082</span><span id="line-82"> this.readCapacityUnit =</span> |
| <span class="source-line-no">083</span><span id="line-83"> conf.getLong(QuotaUtil.READ_CAPACITY_UNIT_CONF_KEY, QuotaUtil.DEFAULT_READ_CAPACITY_UNIT);</span> |
| <span class="source-line-no">084</span><span id="line-84"> this.limiters = limiters;</span> |
| <span class="source-line-no">085</span><span id="line-85"> int size = OperationType.values().length;</span> |
| <span class="source-line-no">086</span><span id="line-86"> operationSize = new long[size];</span> |
| <span class="source-line-no">087</span><span id="line-87"></span> |
| <span class="source-line-no">088</span><span id="line-88"> for (int i = 0; i < size; ++i) {</span> |
| <span class="source-line-no">089</span><span id="line-89"> operationSize[i] = 0;</span> |
| <span class="source-line-no">090</span><span id="line-90"> }</span> |
| <span class="source-line-no">091</span><span id="line-91"> }</span> |
| <span class="source-line-no">092</span><span id="line-92"></span> |
| <span class="source-line-no">093</span><span id="line-93"> @Override</span> |
| <span class="source-line-no">094</span><span id="line-94"> public void checkBatchQuota(int numWrites, int numReads) throws RpcThrottlingException {</span> |
| <span class="source-line-no">095</span><span id="line-95"> updateEstimateConsumeBatchQuota(numWrites, numReads);</span> |
| <span class="source-line-no">096</span><span id="line-96"> checkQuota(numWrites, numReads);</span> |
| <span class="source-line-no">097</span><span id="line-97"> }</span> |
| <span class="source-line-no">098</span><span id="line-98"></span> |
| <span class="source-line-no">099</span><span id="line-99"> @Override</span> |
| <span class="source-line-no">100</span><span id="line-100"> public void checkScanQuota(ClientProtos.ScanRequest scanRequest, long maxScannerResultSize,</span> |
| <span class="source-line-no">101</span><span id="line-101"> long maxBlockBytesScanned, long prevBlockBytesScannedDifference) throws RpcThrottlingException {</span> |
| <span class="source-line-no">102</span><span id="line-102"> updateEstimateConsumeScanQuota(scanRequest, maxScannerResultSize, maxBlockBytesScanned,</span> |
| <span class="source-line-no">103</span><span id="line-103"> prevBlockBytesScannedDifference);</span> |
| <span class="source-line-no">104</span><span id="line-104"> checkQuota(0, 1);</span> |
| <span class="source-line-no">105</span><span id="line-105"> }</span> |
| <span class="source-line-no">106</span><span id="line-106"></span> |
| <span class="source-line-no">107</span><span id="line-107"> private void checkQuota(long numWrites, long numReads) throws RpcThrottlingException {</span> |
| <span class="source-line-no">108</span><span id="line-108"> readAvailable = Long.MAX_VALUE;</span> |
| <span class="source-line-no">109</span><span id="line-109"> for (final QuotaLimiter limiter : limiters) {</span> |
| <span class="source-line-no">110</span><span id="line-110"> if (limiter.isBypass()) {</span> |
| <span class="source-line-no">111</span><span id="line-111"> continue;</span> |
| <span class="source-line-no">112</span><span id="line-112"> }</span> |
| <span class="source-line-no">113</span><span id="line-113"></span> |
| <span class="source-line-no">114</span><span id="line-114"> long maxRequestsToEstimate = limiter.getRequestNumLimit();</span> |
| <span class="source-line-no">115</span><span id="line-115"> long maxReadsToEstimate = Math.min(maxRequestsToEstimate, limiter.getReadNumLimit());</span> |
| <span class="source-line-no">116</span><span id="line-116"> long maxWritesToEstimate = Math.min(maxRequestsToEstimate, limiter.getWriteNumLimit());</span> |
| <span class="source-line-no">117</span><span id="line-117"> long maxReadSizeToEstimate = Math.min(readConsumed, limiter.getReadLimit());</span> |
| <span class="source-line-no">118</span><span id="line-118"> long maxWriteSizeToEstimate = Math.min(writeConsumed, limiter.getWriteLimit());</span> |
| <span class="source-line-no">119</span><span id="line-119"></span> |
| <span class="source-line-no">120</span><span id="line-120"> limiter.checkQuota(Math.min(maxWritesToEstimate, numWrites),</span> |
| <span class="source-line-no">121</span><span id="line-121"> Math.min(maxWriteSizeToEstimate, writeConsumed), Math.min(maxReadsToEstimate, numReads),</span> |
| <span class="source-line-no">122</span><span id="line-122"> Math.min(maxReadSizeToEstimate, readConsumed), writeCapacityUnitConsumed,</span> |
| <span class="source-line-no">123</span><span id="line-123"> readCapacityUnitConsumed);</span> |
| <span class="source-line-no">124</span><span id="line-124"> readAvailable = Math.min(readAvailable, limiter.getReadAvailable());</span> |
| <span class="source-line-no">125</span><span id="line-125"> }</span> |
| <span class="source-line-no">126</span><span id="line-126"></span> |
| <span class="source-line-no">127</span><span id="line-127"> for (final QuotaLimiter limiter : limiters) {</span> |
| <span class="source-line-no">128</span><span id="line-128"> limiter.grabQuota(numWrites, writeConsumed, numReads, readConsumed, writeCapacityUnitConsumed,</span> |
| <span class="source-line-no">129</span><span id="line-129"> readCapacityUnitConsumed);</span> |
| <span class="source-line-no">130</span><span id="line-130"> }</span> |
| <span class="source-line-no">131</span><span id="line-131"> }</span> |
| <span class="source-line-no">132</span><span id="line-132"></span> |
| <span class="source-line-no">133</span><span id="line-133"> @Override</span> |
| <span class="source-line-no">134</span><span id="line-134"> public void close() {</span> |
| <span class="source-line-no">135</span><span id="line-135"> // Adjust the quota consumed for the specified operation</span> |
| <span class="source-line-no">136</span><span id="line-136"> writeDiff = operationSize[OperationType.MUTATE.ordinal()] - writeConsumed;</span> |
| <span class="source-line-no">137</span><span id="line-137"></span> |
| <span class="source-line-no">138</span><span id="line-138"> long resultSize =</span> |
| <span class="source-line-no">139</span><span id="line-139"> operationSize[OperationType.GET.ordinal()] + operationSize[OperationType.SCAN.ordinal()];</span> |
| <span class="source-line-no">140</span><span id="line-140"> if (useResultSizeBytes) {</span> |
| <span class="source-line-no">141</span><span id="line-141"> readDiff = resultSize - readConsumed;</span> |
| <span class="source-line-no">142</span><span id="line-142"> } else {</span> |
| <span class="source-line-no">143</span><span id="line-143"> long blockBytesScanned =</span> |
| <span class="source-line-no">144</span><span id="line-144"> RpcServer.getCurrentCall().map(RpcCall::getBlockBytesScanned).orElse(0L);</span> |
| <span class="source-line-no">145</span><span id="line-145"> readDiff = Math.max(blockBytesScanned, resultSize) - readConsumed;</span> |
| <span class="source-line-no">146</span><span id="line-146"> }</span> |
| <span class="source-line-no">147</span><span id="line-147"></span> |
| <span class="source-line-no">148</span><span id="line-148"> writeCapacityUnitDiff =</span> |
| <span class="source-line-no">149</span><span id="line-149"> calculateWriteCapacityUnitDiff(operationSize[OperationType.MUTATE.ordinal()], writeConsumed);</span> |
| <span class="source-line-no">150</span><span id="line-150"> readCapacityUnitDiff = calculateReadCapacityUnitDiff(</span> |
| <span class="source-line-no">151</span><span id="line-151"> operationSize[OperationType.GET.ordinal()] + operationSize[OperationType.SCAN.ordinal()],</span> |
| <span class="source-line-no">152</span><span id="line-152"> readConsumed);</span> |
| <span class="source-line-no">153</span><span id="line-153"></span> |
| <span class="source-line-no">154</span><span id="line-154"> for (final QuotaLimiter limiter : limiters) {</span> |
| <span class="source-line-no">155</span><span id="line-155"> if (writeDiff != 0) {</span> |
| <span class="source-line-no">156</span><span id="line-156"> limiter.consumeWrite(writeDiff, writeCapacityUnitDiff);</span> |
| <span class="source-line-no">157</span><span id="line-157"> }</span> |
| <span class="source-line-no">158</span><span id="line-158"> if (readDiff != 0) {</span> |
| <span class="source-line-no">159</span><span id="line-159"> limiter.consumeRead(readDiff, readCapacityUnitDiff);</span> |
| <span class="source-line-no">160</span><span id="line-160"> }</span> |
| <span class="source-line-no">161</span><span id="line-161"> }</span> |
| <span class="source-line-no">162</span><span id="line-162"> }</span> |
| <span class="source-line-no">163</span><span id="line-163"></span> |
| <span class="source-line-no">164</span><span id="line-164"> @Override</span> |
| <span class="source-line-no">165</span><span id="line-165"> public long getReadAvailable() {</span> |
| <span class="source-line-no">166</span><span id="line-166"> return readAvailable;</span> |
| <span class="source-line-no">167</span><span id="line-167"> }</span> |
| <span class="source-line-no">168</span><span id="line-168"></span> |
| <span class="source-line-no">169</span><span id="line-169"> @Override</span> |
| <span class="source-line-no">170</span><span id="line-170"> public long getReadConsumed() {</span> |
| <span class="source-line-no">171</span><span id="line-171"> return readConsumed;</span> |
| <span class="source-line-no">172</span><span id="line-172"> }</span> |
| <span class="source-line-no">173</span><span id="line-173"></span> |
| <span class="source-line-no">174</span><span id="line-174"> @Override</span> |
| <span class="source-line-no">175</span><span id="line-175"> public void addGetResult(final Result result) {</span> |
| <span class="source-line-no">176</span><span id="line-176"> operationSize[OperationType.GET.ordinal()] += QuotaUtil.calculateResultSize(result);</span> |
| <span class="source-line-no">177</span><span id="line-177"> }</span> |
| <span class="source-line-no">178</span><span id="line-178"></span> |
| <span class="source-line-no">179</span><span id="line-179"> @Override</span> |
| <span class="source-line-no">180</span><span id="line-180"> public void addScanResult(final List<Result> results) {</span> |
| <span class="source-line-no">181</span><span id="line-181"> operationSize[OperationType.SCAN.ordinal()] += QuotaUtil.calculateResultSize(results);</span> |
| <span class="source-line-no">182</span><span id="line-182"> }</span> |
| <span class="source-line-no">183</span><span id="line-183"></span> |
| <span class="source-line-no">184</span><span id="line-184"> @Override</span> |
| <span class="source-line-no">185</span><span id="line-185"> public void addMutation(final Mutation mutation) {</span> |
| <span class="source-line-no">186</span><span id="line-186"> operationSize[OperationType.MUTATE.ordinal()] += QuotaUtil.calculateMutationSize(mutation);</span> |
| <span class="source-line-no">187</span><span id="line-187"> }</span> |
| <span class="source-line-no">188</span><span id="line-188"></span> |
| <span class="source-line-no">189</span><span id="line-189"> /**</span> |
| <span class="source-line-no">190</span><span id="line-190"> * Update estimate quota(read/write size/capacityUnits) which will be consumed</span> |
| <span class="source-line-no">191</span><span id="line-191"> * @param numWrites the number of write requests</span> |
| <span class="source-line-no">192</span><span id="line-192"> * @param numReads the number of read requests</span> |
| <span class="source-line-no">193</span><span id="line-193"> */</span> |
| <span class="source-line-no">194</span><span id="line-194"> protected void updateEstimateConsumeBatchQuota(int numWrites, int numReads) {</span> |
| <span class="source-line-no">195</span><span id="line-195"> writeConsumed = estimateConsume(OperationType.MUTATE, numWrites, 100);</span> |
| <span class="source-line-no">196</span><span id="line-196"></span> |
| <span class="source-line-no">197</span><span id="line-197"> if (useResultSizeBytes) {</span> |
| <span class="source-line-no">198</span><span id="line-198"> readConsumed = estimateConsume(OperationType.GET, numReads, 100);</span> |
| <span class="source-line-no">199</span><span id="line-199"> } else {</span> |
| <span class="source-line-no">200</span><span id="line-200"> // assume 1 block required for reads. this is probably a low estimate, which is okay</span> |
| <span class="source-line-no">201</span><span id="line-201"> readConsumed = numReads > 0 ? blockSizeBytes : 0;</span> |
| <span class="source-line-no">202</span><span id="line-202"> }</span> |
| <span class="source-line-no">203</span><span id="line-203"></span> |
| <span class="source-line-no">204</span><span id="line-204"> writeCapacityUnitConsumed = calculateWriteCapacityUnit(writeConsumed);</span> |
| <span class="source-line-no">205</span><span id="line-205"> readCapacityUnitConsumed = calculateReadCapacityUnit(readConsumed);</span> |
| <span class="source-line-no">206</span><span id="line-206"> }</span> |
| <span class="source-line-no">207</span><span id="line-207"></span> |
| <span class="source-line-no">208</span><span id="line-208"> /**</span> |
| <span class="source-line-no">209</span><span id="line-209"> * Update estimate quota(read/write size/capacityUnits) which will be consumed</span> |
| <span class="source-line-no">210</span><span id="line-210"> * @param scanRequest the scan to be executed</span> |
| <span class="source-line-no">211</span><span id="line-211"> * @param maxScannerResultSize the maximum bytes to be returned by the scanner</span> |
| <span class="source-line-no">212</span><span id="line-212"> * @param maxBlockBytesScanned the maximum bytes scanned in a single RPC call by the</span> |
| <span class="source-line-no">213</span><span id="line-213"> * scanner</span> |
| <span class="source-line-no">214</span><span id="line-214"> * @param prevBlockBytesScannedDifference the difference between BBS of the previous two next</span> |
| <span class="source-line-no">215</span><span id="line-215"> * calls</span> |
| <span class="source-line-no">216</span><span id="line-216"> */</span> |
| <span class="source-line-no">217</span><span id="line-217"> protected void updateEstimateConsumeScanQuota(ClientProtos.ScanRequest scanRequest,</span> |
| <span class="source-line-no">218</span><span id="line-218"> long maxScannerResultSize, long maxBlockBytesScanned, long prevBlockBytesScannedDifference) {</span> |
| <span class="source-line-no">219</span><span id="line-219"> if (useResultSizeBytes) {</span> |
| <span class="source-line-no">220</span><span id="line-220"> readConsumed = estimateConsume(OperationType.SCAN, 1, 1000);</span> |
| <span class="source-line-no">221</span><span id="line-221"> } else {</span> |
| <span class="source-line-no">222</span><span id="line-222"> long estimate = getScanReadConsumeEstimate(blockSizeBytes, scanRequest.getNextCallSeq(),</span> |
| <span class="source-line-no">223</span><span id="line-223"> maxScannerResultSize, maxBlockBytesScanned, prevBlockBytesScannedDifference);</span> |
| <span class="source-line-no">224</span><span id="line-224"> readConsumed = Math.min(maxScanEstimate, estimate);</span> |
| <span class="source-line-no">225</span><span id="line-225"> }</span> |
| <span class="source-line-no">226</span><span id="line-226"></span> |
| <span class="source-line-no">227</span><span id="line-227"> readCapacityUnitConsumed = calculateReadCapacityUnit(readConsumed);</span> |
| <span class="source-line-no">228</span><span id="line-228"> }</span> |
| <span class="source-line-no">229</span><span id="line-229"></span> |
| <span class="source-line-no">230</span><span id="line-230"> protected static long getScanReadConsumeEstimate(long blockSizeBytes, long nextCallSeq,</span> |
| <span class="source-line-no">231</span><span id="line-231"> long maxScannerResultSize, long maxBlockBytesScanned, long prevBlockBytesScannedDifference) {</span> |
| <span class="source-line-no">232</span><span id="line-232"> /*</span> |
| <span class="source-line-no">233</span><span id="line-233"> * Estimating scan workload is more complicated, and if we severely underestimate workloads then</span> |
| <span class="source-line-no">234</span><span id="line-234"> * throttled clients will exhaust retries too quickly, and could saturate the RPC layer</span> |
| <span class="source-line-no">235</span><span id="line-235"> */</span> |
| <span class="source-line-no">236</span><span id="line-236"> if (nextCallSeq == 0) {</span> |
| <span class="source-line-no">237</span><span id="line-237"> // start scanners with an optimistic 1 block IO estimate</span> |
| <span class="source-line-no">238</span><span id="line-238"> // it is better to underestimate a large scan in the beginning</span> |
| <span class="source-line-no">239</span><span id="line-239"> // than to overestimate, and block, a small scan</span> |
| <span class="source-line-no">240</span><span id="line-240"> return blockSizeBytes;</span> |
| <span class="source-line-no">241</span><span id="line-241"> }</span> |
| <span class="source-line-no">242</span><span id="line-242"></span> |
| <span class="source-line-no">243</span><span id="line-243"> boolean isWorkloadGrowing = prevBlockBytesScannedDifference > blockSizeBytes;</span> |
| <span class="source-line-no">244</span><span id="line-244"> if (isWorkloadGrowing) {</span> |
| <span class="source-line-no">245</span><span id="line-245"> // if nextCallSeq > 0 and the workload is growing then our estimate</span> |
| <span class="source-line-no">246</span><span id="line-246"> // should consider that the workload may continue to increase</span> |
| <span class="source-line-no">247</span><span id="line-247"> return Math.min(maxScannerResultSize, nextCallSeq * maxBlockBytesScanned);</span> |
| <span class="source-line-no">248</span><span id="line-248"> } else {</span> |
| <span class="source-line-no">249</span><span id="line-249"> // if nextCallSeq > 0 and the workload is shrinking or flat</span> |
| <span class="source-line-no">250</span><span id="line-250"> // then our workload has likely plateaued. We can just rely on the existing</span> |
| <span class="source-line-no">251</span><span id="line-251"> // maxBlockBytesScanned as our estimate in this case.</span> |
| <span class="source-line-no">252</span><span id="line-252"> return maxBlockBytesScanned;</span> |
| <span class="source-line-no">253</span><span id="line-253"> }</span> |
| <span class="source-line-no">254</span><span id="line-254"> }</span> |
| <span class="source-line-no">255</span><span id="line-255"></span> |
| <span class="source-line-no">256</span><span id="line-256"> private long estimateConsume(final OperationType type, int numReqs, long avgSize) {</span> |
| <span class="source-line-no">257</span><span id="line-257"> if (numReqs > 0) {</span> |
| <span class="source-line-no">258</span><span id="line-258"> return avgSize * numReqs;</span> |
| <span class="source-line-no">259</span><span id="line-259"> }</span> |
| <span class="source-line-no">260</span><span id="line-260"> return 0;</span> |
| <span class="source-line-no">261</span><span id="line-261"> }</span> |
| <span class="source-line-no">262</span><span id="line-262"></span> |
| <span class="source-line-no">263</span><span id="line-263"> private long calculateWriteCapacityUnit(final long size) {</span> |
| <span class="source-line-no">264</span><span id="line-264"> return (long) Math.ceil(size * 1.0 / this.writeCapacityUnit);</span> |
| <span class="source-line-no">265</span><span id="line-265"> }</span> |
| <span class="source-line-no">266</span><span id="line-266"></span> |
| <span class="source-line-no">267</span><span id="line-267"> private long calculateReadCapacityUnit(final long size) {</span> |
| <span class="source-line-no">268</span><span id="line-268"> return (long) Math.ceil(size * 1.0 / this.readCapacityUnit);</span> |
| <span class="source-line-no">269</span><span id="line-269"> }</span> |
| <span class="source-line-no">270</span><span id="line-270"></span> |
| <span class="source-line-no">271</span><span id="line-271"> private long calculateWriteCapacityUnitDiff(final long actualSize, final long estimateSize) {</span> |
| <span class="source-line-no">272</span><span id="line-272"> return calculateWriteCapacityUnit(actualSize) - calculateWriteCapacityUnit(estimateSize);</span> |
| <span class="source-line-no">273</span><span id="line-273"> }</span> |
| <span class="source-line-no">274</span><span id="line-274"></span> |
| <span class="source-line-no">275</span><span id="line-275"> private long calculateReadCapacityUnitDiff(final long actualSize, final long estimateSize) {</span> |
| <span class="source-line-no">276</span><span id="line-276"> return calculateReadCapacityUnit(actualSize) - calculateReadCapacityUnit(estimateSize);</span> |
| <span class="source-line-no">277</span><span id="line-277"> }</span> |
| <span class="source-line-no">278</span><span id="line-278">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |