http://git-wip-us.apache.org/repos/asf/hbase-site/blob/abb69192/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html index b9ac0db..eb74b5b 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html @@ -6,302 +6,303 @@ </head> <body> <div class="sourceContainer"> -<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> -<span class="sourceLineNo">002</span> * Copyright The Apache Software Foundation<a name="line.2"></a> -<span class="sourceLineNo">003</span> *<a name="line.3"></a> -<span class="sourceLineNo">004</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.4"></a> -<span class="sourceLineNo">005</span> * contributor license agreements. See the NOTICE file distributed with this<a name="line.5"></a> -<span class="sourceLineNo">006</span> * work for additional information regarding copyright ownership. The ASF<a name="line.6"></a> -<span class="sourceLineNo">007</span> * licenses this file to you under the Apache License, Version 2.0 (the<a name="line.7"></a> -<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance with the License.<a name="line.8"></a> -<span class="sourceLineNo">009</span> * You may obtain a copy of the License at<a name="line.9"></a> -<span class="sourceLineNo">010</span> *<a name="line.10"></a> -<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> -<span class="sourceLineNo">012</span> *<a name="line.12"></a> -<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> -<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT<a name="line.14"></a> -<span class="sourceLineNo">015</span> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the<a name="line.15"></a> -<span class="sourceLineNo">016</span> * License for the specific language governing permissions and limitations<a name="line.16"></a> -<span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a> -<span class="sourceLineNo">018</span> */<a name="line.18"></a> -<span class="sourceLineNo">019</span><a name="line.19"></a> -<span class="sourceLineNo">020</span>package org.apache.hadoop.hbase.io.hfile;<a name="line.20"></a> -<span class="sourceLineNo">021</span><a name="line.21"></a> -<span class="sourceLineNo">022</span>import net.spy.memcached.CachedData;<a name="line.22"></a> -<span class="sourceLineNo">023</span>import net.spy.memcached.ConnectionFactoryBuilder;<a name="line.23"></a> -<span class="sourceLineNo">024</span>import net.spy.memcached.FailureMode;<a name="line.24"></a> -<span class="sourceLineNo">025</span>import net.spy.memcached.MemcachedClient;<a name="line.25"></a> -<span class="sourceLineNo">026</span>import net.spy.memcached.transcoders.Transcoder;<a name="line.26"></a> -<span class="sourceLineNo">027</span>import org.apache.commons.logging.Log;<a name="line.27"></a> -<span class="sourceLineNo">028</span>import org.apache.commons.logging.LogFactory;<a name="line.28"></a> -<span class="sourceLineNo">029</span>import org.apache.hadoop.conf.Configuration;<a name="line.29"></a> -<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.HConstants;<a name="line.30"></a> -<span class="sourceLineNo">031</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.31"></a> -<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.32"></a> -<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.33"></a> -<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.34"></a> -<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.util.Addressing;<a name="line.35"></a> -<span class="sourceLineNo">036</span>import org.apache.htrace.Trace;<a name="line.36"></a> -<span class="sourceLineNo">037</span>import org.apache.htrace.TraceScope;<a name="line.37"></a> -<span class="sourceLineNo">038</span><a name="line.38"></a> -<span class="sourceLineNo">039</span><a name="line.39"></a> -<span class="sourceLineNo">040</span>import java.io.IOException;<a name="line.40"></a> -<span class="sourceLineNo">041</span>import java.net.InetSocketAddress;<a name="line.41"></a> -<span class="sourceLineNo">042</span>import java.nio.ByteBuffer;<a name="line.42"></a> -<span class="sourceLineNo">043</span>import java.util.ArrayList;<a name="line.43"></a> -<span class="sourceLineNo">044</span>import java.util.Iterator;<a name="line.44"></a> -<span class="sourceLineNo">045</span>import java.util.List;<a name="line.45"></a> -<span class="sourceLineNo">046</span>import java.util.NoSuchElementException;<a name="line.46"></a> -<span class="sourceLineNo">047</span>import java.util.concurrent.ExecutionException;<a name="line.47"></a> -<span class="sourceLineNo">048</span><a name="line.48"></a> -<span class="sourceLineNo">049</span>/**<a name="line.49"></a> -<span class="sourceLineNo">050</span> * Class to store blocks into memcached.<a name="line.50"></a> -<span class="sourceLineNo">051</span> * This should only be used on a cluster of Memcached daemons that are tuned well and have a<a name="line.51"></a> -<span class="sourceLineNo">052</span> * good network connection to the HBase regionservers. Any other use will likely slow down HBase<a name="line.52"></a> -<span class="sourceLineNo">053</span> * greatly.<a name="line.53"></a> -<span class="sourceLineNo">054</span> */<a name="line.54"></a> -<span class="sourceLineNo">055</span>@InterfaceAudience.Private<a name="line.55"></a> -<span class="sourceLineNo">056</span>public class MemcachedBlockCache implements BlockCache {<a name="line.56"></a> -<span class="sourceLineNo">057</span> private static final Log LOG = LogFactory.getLog(MemcachedBlockCache.class.getName());<a name="line.57"></a> -<span class="sourceLineNo">058</span><a name="line.58"></a> -<span class="sourceLineNo">059</span> // Some memcache versions won't take more than 1024 * 1024. So set the limit below<a name="line.59"></a> -<span class="sourceLineNo">060</span> // that just in case this client is used with those versions.<a name="line.60"></a> -<span class="sourceLineNo">061</span> public static final int MAX_SIZE = 1020 * 1024;<a name="line.61"></a> -<span class="sourceLineNo">062</span><a name="line.62"></a> -<span class="sourceLineNo">063</span> // Config key for what memcached servers to use.<a name="line.63"></a> -<span class="sourceLineNo">064</span> // They should be specified in a comma sperated list with ports.<a name="line.64"></a> -<span class="sourceLineNo">065</span> // like:<a name="line.65"></a> -<span class="sourceLineNo">066</span> //<a name="line.66"></a> -<span class="sourceLineNo">067</span> // host1:11211,host3:8080,host4:11211<a name="line.67"></a> -<span class="sourceLineNo">068</span> public static final String MEMCACHED_CONFIG_KEY = "hbase.cache.memcached.servers";<a name="line.68"></a> -<span class="sourceLineNo">069</span> public static final String MEMCACHED_TIMEOUT_KEY = "hbase.cache.memcached.timeout";<a name="line.69"></a> -<span class="sourceLineNo">070</span> public static final String MEMCACHED_OPTIMEOUT_KEY = "hbase.cache.memcached.optimeout";<a name="line.70"></a> -<span class="sourceLineNo">071</span> public static final String MEMCACHED_OPTIMIZE_KEY = "hbase.cache.memcached.spy.optimze";<a name="line.71"></a> -<span class="sourceLineNo">072</span> public static final long MEMCACHED_DEFAULT_TIMEOUT = 500;<a name="line.72"></a> -<span class="sourceLineNo">073</span> public static final boolean MEMCACHED_OPTIMIZE_DEFAULT = false;<a name="line.73"></a> -<span class="sourceLineNo">074</span><a name="line.74"></a> -<span class="sourceLineNo">075</span> private final MemcachedClient client;<a name="line.75"></a> -<span class="sourceLineNo">076</span> private final HFileBlockTranscoder tc = new HFileBlockTranscoder();<a name="line.76"></a> -<span class="sourceLineNo">077</span> private final CacheStats cacheStats = new CacheStats("MemcachedBlockCache");<a name="line.77"></a> -<span class="sourceLineNo">078</span><a name="line.78"></a> -<span class="sourceLineNo">079</span> public MemcachedBlockCache(Configuration c) throws IOException {<a name="line.79"></a> -<span class="sourceLineNo">080</span> LOG.info("Creating MemcachedBlockCache");<a name="line.80"></a> -<span class="sourceLineNo">081</span><a name="line.81"></a> -<span class="sourceLineNo">082</span> long opTimeout = c.getLong(MEMCACHED_OPTIMEOUT_KEY, MEMCACHED_DEFAULT_TIMEOUT);<a name="line.82"></a> -<span class="sourceLineNo">083</span> long queueTimeout = c.getLong(MEMCACHED_TIMEOUT_KEY, opTimeout + MEMCACHED_DEFAULT_TIMEOUT);<a name="line.83"></a> -<span class="sourceLineNo">084</span> boolean optimize = c.getBoolean(MEMCACHED_OPTIMIZE_KEY, MEMCACHED_OPTIMIZE_DEFAULT);<a name="line.84"></a> -<span class="sourceLineNo">085</span><a name="line.85"></a> -<span class="sourceLineNo">086</span> ConnectionFactoryBuilder builder = new ConnectionFactoryBuilder()<a name="line.86"></a> -<span class="sourceLineNo">087</span> .setOpTimeout(opTimeout)<a name="line.87"></a> -<span class="sourceLineNo">088</span> .setOpQueueMaxBlockTime(queueTimeout) // Cap the max time before anything times out<a name="line.88"></a> -<span class="sourceLineNo">089</span> .setFailureMode(FailureMode.Redistribute)<a name="line.89"></a> -<span class="sourceLineNo">090</span> .setShouldOptimize(optimize)<a name="line.90"></a> -<span class="sourceLineNo">091</span> .setDaemon(true) // Don't keep threads around past the end of days.<a name="line.91"></a> -<span class="sourceLineNo">092</span> .setUseNagleAlgorithm(false) // Ain't nobody got time for that<a name="line.92"></a> -<span class="sourceLineNo">093</span> .setReadBufferSize(HConstants.DEFAULT_BLOCKSIZE * 4 * 1024); // Much larger just in case<a name="line.93"></a> -<span class="sourceLineNo">094</span><a name="line.94"></a> -<span class="sourceLineNo">095</span> // Assume only the localhost is serving memecached.<a name="line.95"></a> -<span class="sourceLineNo">096</span> // A la mcrouter or co-locating memcached with split regionservers.<a name="line.96"></a> -<span class="sourceLineNo">097</span> //<a name="line.97"></a> -<span class="sourceLineNo">098</span> // If this config is a pool of memecached servers they will all be used according to the<a name="line.98"></a> -<span class="sourceLineNo">099</span> // default hashing scheme defined by the memcache client. Spy Memecache client in this<a name="line.99"></a> -<span class="sourceLineNo">100</span> // case.<a name="line.100"></a> -<span class="sourceLineNo">101</span> String serverListString = c.get(MEMCACHED_CONFIG_KEY,"localhost:11211");<a name="line.101"></a> -<span class="sourceLineNo">102</span> String[] servers = serverListString.split(",");<a name="line.102"></a> -<span class="sourceLineNo">103</span> List<InetSocketAddress> serverAddresses = new ArrayList<>(servers.length);<a name="line.103"></a> -<span class="sourceLineNo">104</span> for (String s:servers) {<a name="line.104"></a> -<span class="sourceLineNo">105</span> serverAddresses.add(Addressing.createInetSocketAddressFromHostAndPortStr(s));<a name="line.105"></a> -<span class="sourceLineNo">106</span> }<a name="line.106"></a> -<span class="sourceLineNo">107</span><a name="line.107"></a> -<span class="sourceLineNo">108</span> client = new MemcachedClient(builder.build(), serverAddresses);<a name="line.108"></a> -<span class="sourceLineNo">109</span> }<a name="line.109"></a> -<span class="sourceLineNo">110</span><a name="line.110"></a> -<span class="sourceLineNo">111</span> @Override<a name="line.111"></a> -<span class="sourceLineNo">112</span> public void cacheBlock(BlockCacheKey cacheKey,<a name="line.112"></a> -<span class="sourceLineNo">113</span> Cacheable buf,<a name="line.113"></a> -<span class="sourceLineNo">114</span> boolean inMemory,<a name="line.114"></a> -<span class="sourceLineNo">115</span> boolean cacheDataInL1) {<a name="line.115"></a> -<span class="sourceLineNo">116</span> cacheBlock(cacheKey, buf);<a name="line.116"></a> -<span class="sourceLineNo">117</span> }<a name="line.117"></a> -<span class="sourceLineNo">118</span><a name="line.118"></a> -<span class="sourceLineNo">119</span> @Override<a name="line.119"></a> -<span class="sourceLineNo">120</span> public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf) {<a name="line.120"></a> -<span class="sourceLineNo">121</span> if (buf instanceof HFileBlock) {<a name="line.121"></a> -<span class="sourceLineNo">122</span> client.add(cacheKey.toString(), MAX_SIZE, (HFileBlock) buf, tc);<a name="line.122"></a> -<span class="sourceLineNo">123</span> } else {<a name="line.123"></a> -<span class="sourceLineNo">124</span> if (LOG.isDebugEnabled()) {<a name="line.124"></a> -<span class="sourceLineNo">125</span> LOG.debug("MemcachedBlockCache can not cache Cacheable's of type "<a name="line.125"></a> -<span class="sourceLineNo">126</span> + buf.getClass().toString());<a name="line.126"></a> -<span class="sourceLineNo">127</span> }<a name="line.127"></a> -<span class="sourceLineNo">128</span> }<a name="line.128"></a> -<span class="sourceLineNo">129</span> }<a name="line.129"></a> -<span class="sourceLineNo">130</span><a name="line.130"></a> -<span class="sourceLineNo">131</span> @Override<a name="line.131"></a> -<span class="sourceLineNo">132</span> public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching,<a name="line.132"></a> -<span class="sourceLineNo">133</span> boolean repeat, boolean updateCacheMetrics) {<a name="line.133"></a> -<span class="sourceLineNo">134</span> // Assume that nothing is the block cache<a name="line.134"></a> -<span class="sourceLineNo">135</span> HFileBlock result = null;<a name="line.135"></a> -<span class="sourceLineNo">136</span><a name="line.136"></a> -<span class="sourceLineNo">137</span> try (TraceScope traceScope = Trace.startSpan("MemcachedBlockCache.getBlock")) {<a name="line.137"></a> -<span class="sourceLineNo">138</span> result = client.get(cacheKey.toString(), tc);<a name="line.138"></a> -<span class="sourceLineNo">139</span> } catch (Exception e) {<a name="line.139"></a> -<span class="sourceLineNo">140</span> // Catch a pretty broad set of exceptions to limit any changes in the memecache client<a name="line.140"></a> -<span class="sourceLineNo">141</span> // and how it handles failures from leaking into the read path.<a name="line.141"></a> -<span class="sourceLineNo">142</span> if (LOG.isDebugEnabled()) {<a name="line.142"></a> -<span class="sourceLineNo">143</span> LOG.debug("Exception pulling from memcached [ "<a name="line.143"></a> -<span class="sourceLineNo">144</span> + cacheKey.toString()<a name="line.144"></a> -<span class="sourceLineNo">145</span> + " ]. Treating as a miss.", e);<a name="line.145"></a> -<span class="sourceLineNo">146</span> }<a name="line.146"></a> -<span class="sourceLineNo">147</span> result = null;<a name="line.147"></a> -<span class="sourceLineNo">148</span> } finally {<a name="line.148"></a> -<span class="sourceLineNo">149</span> // Update stats if this request doesn't have it turned off 100% of the time<a name="line.149"></a> -<span class="sourceLineNo">150</span> if (updateCacheMetrics) {<a name="line.150"></a> -<span class="sourceLineNo">151</span> if (result == null) {<a name="line.151"></a> -<span class="sourceLineNo">152</span> cacheStats.miss(caching, cacheKey.isPrimary(), cacheKey.getBlockType());<a name="line.152"></a> -<span class="sourceLineNo">153</span> } else {<a name="line.153"></a> -<span class="sourceLineNo">154</span> cacheStats.hit(caching, cacheKey.isPrimary(), cacheKey.getBlockType());<a name="line.154"></a> -<span class="sourceLineNo">155</span> }<a name="line.155"></a> -<span class="sourceLineNo">156</span> }<a name="line.156"></a> -<span class="sourceLineNo">157</span> }<a name="line.157"></a> -<span class="sourceLineNo">158</span><a name="line.158"></a> -<span class="sourceLineNo">159</span> return result;<a name="line.159"></a> -<span class="sourceLineNo">160</span> }<a name="line.160"></a> -<span class="sourceLineNo">161</span><a name="line.161"></a> -<span class="sourceLineNo">162</span> @Override<a name="line.162"></a> -<span class="sourceLineNo">163</span> public boolean evictBlock(BlockCacheKey cacheKey) {<a name="line.163"></a> -<span class="sourceLineNo">164</span> try {<a name="line.164"></a> -<span class="sourceLineNo">165</span> cacheStats.evict();<a name="line.165"></a> -<span class="sourceLineNo">166</span> return client.delete(cacheKey.toString()).get();<a name="line.166"></a> -<span class="sourceLineNo">167</span> } catch (InterruptedException e) {<a name="line.167"></a> -<span class="sourceLineNo">168</span> LOG.warn("Error deleting " + cacheKey.toString(), e);<a name="line.168"></a> -<span class="sourceLineNo">169</span> Thread.currentThread().interrupt();<a name="line.169"></a> -<span class="sourceLineNo">170</span> } catch (ExecutionException e) {<a name="line.170"></a> -<span class="sourceLineNo">171</span> if (LOG.isDebugEnabled()) {<a name="line.171"></a> -<span class="sourceLineNo">172</span> LOG.debug("Error deleting " + cacheKey.toString(), e);<a name="line.172"></a> -<span class="sourceLineNo">173</span> }<a name="line.173"></a> -<span class="sourceLineNo">174</span> }<a name="line.174"></a> -<span class="sourceLineNo">175</span> return false;<a name="line.175"></a> -<span class="sourceLineNo">176</span> }<a name="line.176"></a> -<span class="sourceLineNo">177</span><a name="line.177"></a> -<span class="sourceLineNo">178</span> /**<a name="line.178"></a> -<span class="sourceLineNo">179</span> * This method does nothing so that memcached can handle all evictions.<a name="line.179"></a> -<span 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{<a name="line.233"></a> -<span class="sourceLineNo">234</span> @Override<a name="line.234"></a> -<span class="sourceLineNo">235</span> public boolean hasNext() {<a name="line.235"></a> -<span class="sourceLineNo">236</span> return false;<a name="line.236"></a> -<span class="sourceLineNo">237</span> }<a name="line.237"></a> -<span class="sourceLineNo">238</span><a name="line.238"></a> -<span class="sourceLineNo">239</span> @Override<a name="line.239"></a> -<span class="sourceLineNo">240</span> public CachedBlock next() {<a name="line.240"></a> -<span class="sourceLineNo">241</span> throw new NoSuchElementException("MemcachedBlockCache can't iterate over blocks.");<a name="line.241"></a> -<span class="sourceLineNo">242</span> }<a name="line.242"></a> -<span class="sourceLineNo">243</span><a name="line.243"></a> -<span class="sourceLineNo">244</span> @Override<a name="line.244"></a> -<span class="sourceLineNo">245</span> public void remove() {<a name="line.245"></a> -<span 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class="sourceLineNo">259</span> private static class HFileBlockTranscoder implements Transcoder<HFileBlock> {<a name="line.259"></a> -<span class="sourceLineNo">260</span><a name="line.260"></a> -<span class="sourceLineNo">261</span> @Override<a name="line.261"></a> -<span class="sourceLineNo">262</span> public boolean asyncDecode(CachedData d) {<a name="line.262"></a> -<span class="sourceLineNo">263</span> return false;<a name="line.263"></a> -<span class="sourceLineNo">264</span> }<a name="line.264"></a> -<span class="sourceLineNo">265</span><a name="line.265"></a> -<span class="sourceLineNo">266</span> @Override<a name="line.266"></a> -<span class="sourceLineNo">267</span> public CachedData encode(HFileBlock block) {<a name="line.267"></a> -<span class="sourceLineNo">268</span> ByteBuffer bb = ByteBuffer.allocate(block.getSerializedLength());<a name="line.268"></a> -<span class="sourceLineNo">269</span> block.serialize(bb);<a name="line.269"></a> -<span class="sourceLineNo">270</span> return new CachedData(0, bb.array(), CachedData.MAX_SIZE);<a name="line.270"></a> -<span class="sourceLineNo">271</span> }<a name="line.271"></a> -<span class="sourceLineNo">272</span><a name="line.272"></a> -<span class="sourceLineNo">273</span> @Override<a name="line.273"></a> -<span class="sourceLineNo">274</span> public HFileBlock decode(CachedData d) {<a name="line.274"></a> -<span class="sourceLineNo">275</span> try {<a name="line.275"></a> -<span class="sourceLineNo">276</span> ByteBuff buf = new SingleByteBuff(ByteBuffer.wrap(d.getData()));<a name="line.276"></a> -<span class="sourceLineNo">277</span> return (HFileBlock) HFileBlock.BLOCK_DESERIALIZER.deserialize(buf, true,<a name="line.277"></a> -<span class="sourceLineNo">278</span> MemoryType.EXCLUSIVE);<a name="line.278"></a> -<span class="sourceLineNo">279</span> } catch (IOException e) {<a name="line.279"></a> -<span class="sourceLineNo">280</span> LOG.warn("Error deserializing data from memcached",e);<a name="line.280"></a> -<span class="sourceLineNo">281</span> }<a name="line.281"></a> -<span class="sourceLineNo">282</span> return null;<a name="line.282"></a> -<span class="sourceLineNo">283</span> }<a name="line.283"></a> -<span class="sourceLineNo">284</span><a name="line.284"></a> -<span class="sourceLineNo">285</span> @Override<a name="line.285"></a> -<span class="sourceLineNo">286</span> public int getMaxSize() {<a name="line.286"></a> -<span class="sourceLineNo">287</span> return MAX_SIZE;<a name="line.287"></a> -<span class="sourceLineNo">288</span> }<a name="line.288"></a> -<span class="sourceLineNo">289</span> }<a name="line.289"></a> -<span class="sourceLineNo">290</span><a name="line.290"></a> -<span class="sourceLineNo">291</span> @Override<a name="line.291"></a> -<span class="sourceLineNo">292</span> public void returnBlock(BlockCacheKey cacheKey, Cacheable block) {<a name="line.292"></a> -<span class="sourceLineNo">293</span> // Not doing reference counting. All blocks here are EXCLUSIVE<a name="line.293"></a> -<span class="sourceLineNo">294</span> }<a name="line.294"></a> -<span class="sourceLineNo">295</span><a name="line.295"></a> -<span class="sourceLineNo">296</span>}<a name="line.296"></a> +<pre><span class="sourceLineNo">001</span><a name="line.1"></a> +<span class="sourceLineNo">002</span>/**<a name="line.2"></a> +<span class="sourceLineNo">003</span> * Copyright The Apache Software Foundation<a name="line.3"></a> +<span class="sourceLineNo">004</span> *<a name="line.4"></a> +<span class="sourceLineNo">005</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.5"></a> +<span class="sourceLineNo">006</span> * contributor license agreements. See the NOTICE file distributed with this<a name="line.6"></a> +<span class="sourceLineNo">007</span> * work for additional information regarding copyright ownership. The ASF<a name="line.7"></a> +<span class="sourceLineNo">008</span> * licenses this file to you under the Apache License, Version 2.0 (the<a name="line.8"></a> +<span class="sourceLineNo">009</span> * "License"); you may not use this file except in compliance with the License.<a name="line.9"></a> +<span class="sourceLineNo">010</span> * You may obtain a copy of the License at<a name="line.10"></a> +<span class="sourceLineNo">011</span> *<a name="line.11"></a> +<span class="sourceLineNo">012</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.12"></a> +<span class="sourceLineNo">013</span> *<a name="line.13"></a> +<span class="sourceLineNo">014</span> * Unless required by applicable law or agreed to in writing, software<a name="line.14"></a> +<span class="sourceLineNo">015</span> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT<a name="line.15"></a> +<span class="sourceLineNo">016</span> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the<a name="line.16"></a> +<span class="sourceLineNo">017</span> * License for the specific language governing permissions and limitations<a name="line.17"></a> +<span class="sourceLineNo">018</span> * under the License.<a name="line.18"></a> +<span class="sourceLineNo">019</span> */<a name="line.19"></a> +<span class="sourceLineNo">020</span><a name="line.20"></a> +<span class="sourceLineNo">021</span>package org.apache.hadoop.hbase.io.hfile;<a name="line.21"></a> +<span class="sourceLineNo">022</span><a name="line.22"></a> +<span class="sourceLineNo">023</span>import java.io.IOException;<a name="line.23"></a> +<span class="sourceLineNo">024</span>import java.net.InetSocketAddress;<a name="line.24"></a> +<span class="sourceLineNo">025</span>import java.nio.ByteBuffer;<a name="line.25"></a> +<span class="sourceLineNo">026</span>import java.util.ArrayList;<a name="line.26"></a> +<span class="sourceLineNo">027</span>import java.util.Iterator;<a name="line.27"></a> +<span class="sourceLineNo">028</span>import java.util.List;<a name="line.28"></a> +<span class="sourceLineNo">029</span>import java.util.NoSuchElementException;<a name="line.29"></a> +<span class="sourceLineNo">030</span>import java.util.concurrent.ExecutionException;<a name="line.30"></a> +<span class="sourceLineNo">031</span><a name="line.31"></a> +<span class="sourceLineNo">032</span>import org.apache.commons.logging.Log;<a name="line.32"></a> +<span class="sourceLineNo">033</span>import org.apache.commons.logging.LogFactory;<a name="line.33"></a> +<span class="sourceLineNo">034</span>import org.apache.hadoop.conf.Configuration;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.HConstants;<a name="line.35"></a> +<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.36"></a> +<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.37"></a> +<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.38"></a> +<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.39"></a> +<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.util.Addressing;<a name="line.40"></a> +<span class="sourceLineNo">041</span>import org.apache.htrace.core.TraceScope;<a name="line.41"></a> +<span class="sourceLineNo">042</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.42"></a> +<span class="sourceLineNo">043</span><a name="line.43"></a> +<span class="sourceLineNo">044</span>import net.spy.memcached.CachedData;<a name="line.44"></a> +<span class="sourceLineNo">045</span>import net.spy.memcached.ConnectionFactoryBuilder;<a name="line.45"></a> +<span class="sourceLineNo">046</span>import net.spy.memcached.FailureMode;<a name="line.46"></a> +<span class="sourceLineNo">047</span>import net.spy.memcached.MemcachedClient;<a name="line.47"></a> +<span class="sourceLineNo">048</span>import net.spy.memcached.transcoders.Transcoder;<a name="line.48"></a> +<span class="sourceLineNo">049</span><a name="line.49"></a> +<span class="sourceLineNo">050</span>/**<a name="line.50"></a> +<span class="sourceLineNo">051</span> * Class to store blocks into memcached.<a name="line.51"></a> +<span class="sourceLineNo">052</span> * This should only be used on a cluster of Memcached daemons that are tuned well and have a<a name="line.52"></a> +<span class="sourceLineNo">053</span> * good network connection to the HBase regionservers. Any other use will likely slow down HBase<a name="line.53"></a> +<span class="sourceLineNo">054</span> * greatly.<a name="line.54"></a> +<span class="sourceLineNo">055</span> */<a name="line.55"></a> +<span class="sourceLineNo">056</span>@InterfaceAudience.Private<a name="line.56"></a> +<span class="sourceLineNo">057</span>public class MemcachedBlockCache implements BlockCache {<a name="line.57"></a> +<span class="sourceLineNo">058</span> private static final Log LOG = LogFactory.getLog(MemcachedBlockCache.class.getName());<a name="line.58"></a> +<span class="sourceLineNo">059</span><a name="line.59"></a> +<span class="sourceLineNo">060</span> // Some memcache versions won't take more than 1024 * 1024. So set the limit below<a name="line.60"></a> +<span class="sourceLineNo">061</span> // that just in case this client is used with those versions.<a name="line.61"></a> +<span class="sourceLineNo">062</span> public static final int MAX_SIZE = 1020 * 1024;<a name="line.62"></a> +<span class="sourceLineNo">063</span><a name="line.63"></a> +<span class="sourceLineNo">064</span> // Config key for what memcached servers to use.<a name="line.64"></a> +<span class="sourceLineNo">065</span> // They should be specified in a comma sperated list with ports.<a name="line.65"></a> +<span class="sourceLineNo">066</span> // like:<a name="line.66"></a> +<span class="sourceLineNo">067</span> //<a name="line.67"></a> +<span class="sourceLineNo">068</span> // host1:11211,host3:8080,host4:11211<a name="line.68"></a> +<span class="sourceLineNo">069</span> public static final String MEMCACHED_CONFIG_KEY = "hbase.cache.memcached.servers";<a name="line.69"></a> +<span class="sourceLineNo">070</span> public static final String MEMCACHED_TIMEOUT_KEY = "hbase.cache.memcached.timeout";<a name="line.70"></a> +<span class="sourceLineNo">071</span> public static final String MEMCACHED_OPTIMEOUT_KEY = "hbase.cache.memcached.optimeout";<a name="line.71"></a> +<span class="sourceLineNo">072</span> public static final String MEMCACHED_OPTIMIZE_KEY = "hbase.cache.memcached.spy.optimze";<a name="line.72"></a> +<span class="sourceLineNo">073</span> public static final long MEMCACHED_DEFAULT_TIMEOUT = 500;<a name="line.73"></a> +<span class="sourceLineNo">074</span> public static final boolean MEMCACHED_OPTIMIZE_DEFAULT = false;<a name="line.74"></a> +<span class="sourceLineNo">075</span><a name="line.75"></a> +<span class="sourceLineNo">076</span> private final MemcachedClient client;<a name="line.76"></a> +<span class="sourceLineNo">077</span> private final HFileBlockTranscoder tc = new HFileBlockTranscoder();<a name="line.77"></a> +<span class="sourceLineNo">078</span> private final CacheStats cacheStats = new CacheStats("MemcachedBlockCache");<a name="line.78"></a> +<span class="sourceLineNo">079</span><a name="line.79"></a> +<span class="sourceLineNo">080</span> public MemcachedBlockCache(Configuration c) throws IOException {<a name="line.80"></a> +<span class="sourceLineNo">081</span> LOG.info("Creating MemcachedBlockCache");<a name="line.81"></a> +<span class="sourceLineNo">082</span><a name="line.82"></a> +<span class="sourceLineNo">083</span> long opTimeout = c.getLong(MEMCACHED_OPTIMEOUT_KEY, MEMCACHED_DEFAULT_TIMEOUT);<a name="line.83"></a> +<span class="sourceLineNo">084</span> long queueTimeout = c.getLong(MEMCACHED_TIMEOUT_KEY, opTimeout + MEMCACHED_DEFAULT_TIMEOUT);<a name="line.84"></a> +<span class="sourceLineNo">085</span> boolean optimize = c.getBoolean(MEMCACHED_OPTIMIZE_KEY, MEMCACHED_OPTIMIZE_DEFAULT);<a name="line.85"></a> +<span class="sourceLineNo">086</span><a name="line.86"></a> +<span class="sourceLineNo">087</span> ConnectionFactoryBuilder builder = new ConnectionFactoryBuilder()<a name="line.87"></a> +<span class="sourceLineNo">088</span> .setOpTimeout(opTimeout)<a name="line.88"></a> +<span class="sourceLineNo">089</span> .setOpQueueMaxBlockTime(queueTimeout) // Cap the max time before anything times out<a name="line.89"></a> +<span class="sourceLineNo">090</span> .setFailureMode(FailureMode.Redistribute)<a name="line.90"></a> +<span class="sourceLineNo">091</span> .setShouldOptimize(optimize)<a name="line.91"></a> +<span class="sourceLineNo">092</span> .setDaemon(true) // Don't keep threads around past the end of days.<a name="line.92"></a> +<span class="sourceLineNo">093</span> .setUseNagleAlgorithm(false) // Ain't nobody got time for that<a name="line.93"></a> +<span class="sourceLineNo">094</span> .setReadBufferSize(HConstants.DEFAULT_BLOCKSIZE * 4 * 1024); // Much larger just in case<a name="line.94"></a> +<span class="sourceLineNo">095</span><a name="line.95"></a> +<span class="sourceLineNo">096</span> // Assume only the localhost is serving memecached.<a name="line.96"></a> +<span class="sourceLineNo">097</span> // A la mcrouter or co-locating memcached with split regionservers.<a name="line.97"></a> +<span class="sourceLineNo">098</span> //<a name="line.98"></a> +<span class="sourceLineNo">099</span> // If this config is a pool of memecached servers they will all be used according to the<a name="line.99"></a> +<span class="sourceLineNo">100</span> // default hashing scheme defined by the memcache client. Spy Memecache client in this<a name="line.100"></a> +<span class="sourceLineNo">101</span> // case.<a name="line.101"></a> +<span class="sourceLineNo">102</span> String serverListString = c.get(MEMCACHED_CONFIG_KEY,"localhost:11211");<a name="line.102"></a> +<span class="sourceLineNo">103</span> String[] servers = serverListString.split(",");<a name="line.103"></a> +<span class="sourceLineNo">104</span> List<InetSocketAddress> serverAddresses = new ArrayList<>(servers.length);<a name="line.104"></a> +<span class="sourceLineNo">105</span> for (String s:servers) {<a name="line.105"></a> +<span class="sourceLineNo">106</span> serverAddresses.add(Addressing.createInetSocketAddressFromHostAndPortStr(s));<a name="line.106"></a> +<span class="sourceLineNo">107</span> }<a name="line.107"></a> +<span class="sourceLineNo">108</span><a name="line.108"></a> +<span class="sourceLineNo">109</span> client = new MemcachedClient(builder.build(), serverAddresses);<a name="line.109"></a> +<span class="sourceLineNo">110</span> }<a name="line.110"></a> +<span class="sourceLineNo">111</span><a name="line.111"></a> +<span class="sourceLineNo">112</span> @Override<a name="line.112"></a> +<span class="sourceLineNo">113</span> public void cacheBlock(BlockCacheKey cacheKey,<a name="line.113"></a> +<span class="sourceLineNo">114</span> Cacheable buf,<a name="line.114"></a> +<span class="sourceLineNo">115</span> boolean inMemory,<a name="line.115"></a> +<span class="sourceLineNo">116</span> boolean cacheDataInL1) {<a name="line.116"></a> +<span class="sourceLineNo">117</span> cacheBlock(cacheKey, buf);<a name="line.117"></a> +<span class="sourceLineNo">118</span> }<a name="line.118"></a> +<span class="sourceLineNo">119</span><a name="line.119"></a> +<span class="sourceLineNo">120</span> @Override<a name="line.120"></a> +<span class="sourceLineNo">121</span> public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf) {<a name="line.121"></a> +<span class="sourceLineNo">122</span> if (buf instanceof HFileBlock) {<a name="line.122"></a> +<span class="sourceLineNo">123</span> client.add(cacheKey.toString(), MAX_SIZE, (HFileBlock) buf, tc);<a name="line.123"></a> +<span class="sourceLineNo">124</span> } else {<a name="line.124"></a> +<span class="sourceLineNo">125</span> if (LOG.isDebugEnabled()) {<a name="line.125"></a> +<span class="sourceLineNo">126</span> LOG.debug("MemcachedBlockCache can not cache Cacheable's of type "<a name="line.126"></a> +<span class="sourceLineNo">127</span> + buf.getClass().toString());<a name="line.127"></a> +<span class="sourceLineNo">128</span> }<a name="line.128"></a> +<span class="sourceLineNo">129</span> }<a name="line.129"></a> +<span class="sourceLineNo">130</span> }<a name="line.130"></a> +<span class="sourceLineNo">131</span><a name="line.131"></a> +<span class="sourceLineNo">132</span> @Override<a name="line.132"></a> +<span class="sourceLineNo">133</span> public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching,<a name="line.133"></a> +<span class="sourceLineNo">134</span> boolean repeat, boolean updateCacheMetrics) {<a name="line.134"></a> +<span class="sourceLineNo">135</span> // Assume that nothing is the block cache<a name="line.135"></a> +<span class="sourceLineNo">136</span> HFileBlock result = null;<a name="line.136"></a> +<span class="sourceLineNo">137</span><a name="line.137"></a> +<span class="sourceLineNo">138</span> try (TraceScope traceScope = TraceUtil.createTrace("MemcachedBlockCache.getBlock")) {<a name="line.138"></a> +<span class="sourceLineNo">139</span> result = client.get(cacheKey.toString(), tc);<a name="line.139"></a> +<span class="sourceLineNo">140</span> } catch (Exception e) {<a name="line.140"></a> +<span class="sourceLineNo">141</span> // Catch a pretty broad set of exceptions to limit any changes in the memecache client<a name="line.141"></a> +<span class="sourceLineNo">142</span> // and how it handles failures from leaking into the read path.<a name="line.142"></a> +<span class="sourceLineNo">143</span> if (LOG.isDebugEnabled()) {<a name="line.143"></a> +<span class="sourceLineNo">144</span> LOG.debug("Exception pulling from memcached [ "<a name="line.144"></a> +<span class="sourceLineNo">145</span> + cacheKey.toString()<a name="line.145"></a> +<span class="sourceLineNo">146</span> + " ]. Treating as a miss.", e);<a name="line.146"></a> +<span class="sourceLineNo">147</span> }<a name="line.147"></a> +<span class="sourceLineNo">148</span> result = null;<a name="line.148"></a> +<span class="sourceLineNo">149</span> } finally {<a name="line.149"></a> +<span class="sourceLineNo">150</span> // Update stats if this request doesn't have it turned off 100% of the time<a name="line.150"></a> +<span class="sourceLineNo">151</span> if (updateCacheMetrics) {<a name="line.151"></a> +<span class="sourceLineNo">152</span> if (result == null) {<a name="line.152"></a> +<span class="sourceLineNo">153</span> cacheStats.miss(caching, cacheKey.isPrimary(), cacheKey.getBlockType());<a name="line.153"></a> +<span class="sourceLineNo">154</span> } else {<a name="line.154"></a> +<span class="sourceLineNo">155</span> cacheStats.hit(caching, cacheKey.isPrimary(), cacheKey.getBlockType());<a name="line.155"></a> +<span class="sourceLineNo">156</span> }<a name="line.156"></a> +<span class="sourceLineNo">157</span> }<a name="line.157"></a> +<span class="sourceLineNo">158</span> }<a name="line.158"></a> +<span class="sourceLineNo">159</span><a name="line.159"></a> +<span class="sourceLineNo">160</span> return result;<a name="line.160"></a> +<span class="sourceLineNo">161</span> }<a name="line.161"></a> +<span class="sourceLineNo">162</span><a name="line.162"></a> +<span class="sourceLineNo">163</span> @Override<a name="line.163"></a> +<span class="sourceLineNo">164</span> public boolean evictBlock(BlockCacheKey cacheKey) {<a name="line.164"></a> +<span class="sourceLineNo">165</span> try {<a name="line.165"></a> +<span class="sourceLineNo">166</span> cacheStats.evict();<a name="line.166"></a> +<span class="sourceLineNo">167</span> return client.delete(cacheKey.toString()).get();<a name="line.167"></a> +<span class="sourceLineNo">168</span> } catch (InterruptedException e) {<a name="line.168"></a> +<span class="sourceLineNo">169</span> LOG.warn("Error deleting " + cacheKey.toString(), e);<a name="line.169"></a> +<span class="sourceLineNo">170</span> Thread.currentThread().interrupt();<a name="line.170"></a> +<span class="sourceLineNo">171</span> } catch (ExecutionException e) {<a name="line.171"></a> +<span class="sourceLineNo">172</span> if (LOG.isDebugEnabled()) {<a name="line.172"></a> +<span class="sourceLineNo">173</span> LOG.debug("Error deleting " + cacheKey.toString(), e);<a name="line.173"></a> +<span class="sourceLineNo">174</span> }<a name="line.174"></a> +<span class="sourceLineNo">175</span> }<a name="line.175"></a> +<span class="sourceLineNo">176</span> return false;<a name="line.176"></a> +<span class="sourceLineNo">177</span> }<a name="line.177"></a> +<span class="sourceLineNo">178</span><a name="line.178"></a> +<span class="sourceLineNo">179</span> /**<a name="line.179"></a> +<span class="sourceLineNo">180</span> * This method does nothing so that memcached can handle all evictions.<a name="line.180"></a> +<span 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counting. All blocks here are EXCLUSIVE<a name="line.294"></a> +<span class="sourceLineNo">295</span> }<a name="line.295"></a> +<span class="sourceLineNo">296</span><a name="line.296"></a> +<span class="sourceLineNo">297</span>}<a name="line.297"></a>
