企业网站宣传,网站需求分析的重要,长沙房地产交易中心,wordpress账号密码在哪个文件下一、普通同步方式二、事务方式(Transactions)三、管道(Pipelining)四、管道中调用事务五、分布式直连同步调用六、分布式直连异步调用七、分布式连接池同步调用八、分布式连接池异步调用九、需要注意的地方十、测试十一、完整的测试代码jedis是一个著名的key-value存储系统而作为其官方推荐的java版客户端jedis也非常强大和稳定支持事务、管道及有jedis自身实现的分布式。 在这里对jedis关于事务、管道和分布式的调用方式做一个简单的介绍和对比 一、普通同步方式 最简单和基础的调用方式 ? 1 2 3 4 5 6 7 8 9 10 11 Test public void test1Normal() { Jedis jedis new Jedis(localhost); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { String result jedis.set(n i, n i); } long end System.currentTimeMillis(); System.out.println(Simple SET: ((end - start)/1000.0) seconds); jedis.disconnect(); } 很简单吧每次set之后都可以返回结果标记是否成功。 二、事务方式(Transactions) redis的事务很简单他主要目的是保障一个client发起的事务中的命令可以连续的执行而中间不会插入其他client的命令。 看下面例子 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 Test public void test2Trans() { Jedis jedis new Jedis(localhost); long start System.currentTimeMillis(); Transaction tx jedis.multi(); for (int i 0; i 100000; i) { tx.set(t i, t i); } ListObject results tx.exec(); long end System.currentTimeMillis(); System.out.println(Transaction SET: ((end - start)/1000.0) seconds); jedis.disconnect(); } 我们调用jedis.watch(…)方法来监控key如果调用后key值发生变化则整个事务会执行失败。另外事务中某个操作失败并不会回滚其他操作。这一点需要注意。还有我们可以使用discard()方法来取消事务。 三、管道(Pipelining) 有时我们需要采用异步方式一次发送多个指令不同步等待其返回结果。这样可以取得非常好的执行效率。这就是管道调用方法如下 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 Test public void test3Pipelined() { Jedis jedis new Jedis(localhost); Pipeline pipeline jedis.pipelined(); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { pipeline.set(p i, p i); } ListObject results pipeline.syncAndReturnAll(); long end System.currentTimeMillis(); System.out.println(Pipelined SET: ((end - start)/1000.0) seconds); jedis.disconnect(); } 四、管道中调用事务 就Jedis提供的方法而言是可以做到在管道中使用事务其代码如下 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Test public void test4combPipelineTrans() { jedis new Jedis(localhost); long start System.currentTimeMillis(); Pipeline pipeline jedis.pipelined(); pipeline.multi(); for (int i 0; i 100000; i) { pipeline.set( i, i); } pipeline.exec(); ListObject results pipeline.syncAndReturnAll(); long end System.currentTimeMillis(); System.out.println(Pipelined transaction: ((end - start)/1000.0) seconds); jedis.disconnect(); } 但是经测试见本文后续部分发现其效率和单独使用事务差不多甚至还略微差点。 五、分布式直连同步调用 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Test public void test5shardNormal() { ListJedisShardInfo shards Arrays.asList( new JedisShardInfo(localhost,6379), new JedisShardInfo(localhost,6380)); ShardedJedis sharding new ShardedJedis(shards); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { String result sharding.set(sn i, n i); } long end System.currentTimeMillis(); System.out.println(SimpleSharing SET: ((end - start)/1000.0) seconds); sharding.disconnect(); } 这个是分布式直接连接并且是同步调用每步执行都返回执行结果。类似地还有异步管道调用。 六、分布式直连异步调用 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Test public void test6shardpipelined() { ListJedisShardInfo shards Arrays.asList( new JedisShardInfo(localhost,6379), new JedisShardInfo(localhost,6380)); ShardedJedis sharding new ShardedJedis(shards); ShardedJedisPipeline pipeline sharding.pipelined(); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { pipeline.set(sp i, p i); } ListObject results pipeline.syncAndReturnAll(); long end System.currentTimeMillis(); System.out.println(PipelinedSharing SET: ((end - start)/1000.0) seconds); sharding.disconnect(); } 七、分布式连接池同步调用 如果你的分布式调用代码是运行在线程中那么上面两个直连调用方式就不合适了因为直连方式是非线程安全的这个时候你就必须选择连接池调用。 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Test public void test7shardSimplePool() { ListJedisShardInfo shards Arrays.asList( new JedisShardInfo(localhost,6379), new JedisShardInfo(localhost,6380)); ShardedJedisPool pool new ShardedJedisPool(new JedisPoolConfig(), shards); ShardedJedis one pool.getResource(); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { String result one.set(spn i, n i); } long end System.currentTimeMillis(); pool.returnResource(one); System.out.println(SimplePool SET: ((end - start)/1000.0) seconds); pool.destroy(); } 上面是同步方式当然还有异步方式。 八、分布式连接池异步调用 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Test public void test8shardPipelinedPool() { ListJedisShardInfo shards Arrays.asList( new JedisShardInfo(localhost,6379), new JedisShardInfo(localhost,6380)); ShardedJedisPool pool new ShardedJedisPool(new JedisPoolConfig(), shards); ShardedJedis one pool.getResource(); ShardedJedisPipeline pipeline one.pipelined(); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { pipeline.set(sppn i, n i); } ListObject results pipeline.syncAndReturnAll(); long end System.currentTimeMillis(); pool.returnResource(one); System.out.println(PipelinedPool SET: ((end - start)/1000.0) seconds); pool.destroy(); } 九、需要注意的地方 事务和管道都是异步模式。在事务和管道中不能同步查询结果。比如下面两个调用都是不允许的 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Transaction tx jedis.multi(); for (int i 0; i 100000; i) { tx.set(t i, t i); } System.out.println(tx.get(t1000).get()); //不允许 ListObject results tx.exec(); … … Pipeline pipeline jedis.pipelined(); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { pipeline.set(p i, p i); } System.out.println(pipeline.get(p1000).get()); //不允许 ListObject results pipeline.syncAndReturnAll(); 事务和管道都是异步的个人感觉在管道中再进行事务调用没有必要不如直接进行事务模式。 分布式中连接池的性能比直连的性能略好(见后续测试部分)。 分布式调用中不支持事务。 因为事务是在服务器端实现而在分布式中每批次的调用对象都可能访问不同的机器所以没法进行事务。 十、测试 运行上面的代码进行测试其结果如下 ? 1 2 3 4 5 6 7 8 9 10 11 Simple SET: 5.227 seconds Transaction SET: 0.5 seconds Pipelined SET: 0.353 seconds Pipelined transaction: 0.509 seconds SimpleSharing SET: 5.289 seconds PipelinedSharing SET: 0.348 seconds SimplePool SET: 5.039 seconds PipelinedPool SET: 0.401 seconds 另外经测试分布式中用到的机器越多调用会越慢。上面是2片下面是5片 ? 1 2 3 4 SimpleSharing SET: 5.494 seconds PipelinedSharing SET: 0.51 seconds SimplePool SET: 5.223 seconds PipelinedPool SET: 0.518 seconds 下面是10片 ? 1 2 3 4 SimpleSharing SET: 5.9 seconds PipelinedSharing SET: 0.794 seconds SimplePool SET: 5.624 seconds PipelinedPool SET: 0.762 seconds 下面是100片 ? 1 2 3 4 SimpleSharing SET: 14.055 seconds PipelinedSharing SET: 8.185 seconds SimplePool SET: 13.29 seconds PipelinedPool SET: 7.767 seconds 分布式中连接池方式调用不但线程安全外根据上面的测试数据也可以看出连接池比直连的效率更好。 十一、完整的测试代码 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 package com.example.nosqlclient; import java.util.Arrays; import java.util.List; import org.junit.AfterClass; import org.junit.BeforeClass; import org.junit.Test; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPoolConfig; import redis.clients.jedis.JedisShardInfo; import redis.clients.jedis.Pipeline; import redis.clients.jedis.ShardedJedis; import redis.clients.jedis.ShardedJedisPipeline; import redis.clients.jedis.ShardedJedisPool; import redis.clients.jedis.Transaction; import org.junit.FixMethodOrder; import org.junit.runners.MethodSorters; FixMethodOrder(MethodSorters.NAME_ASCENDING) public class TestJedis { private static Jedis jedis; private static ShardedJedis sharding; private static ShardedJedisPool pool; BeforeClass public static void setUpBeforeClass() throws Exception { ListJedisShardInfo shards Arrays.asList( new JedisShardInfo(localhost,6379), new JedisShardInfo(localhost,6379)); //使用相同的ip:port,仅作测试 jedis new Jedis(localhost); sharding new ShardedJedis(shards); pool new ShardedJedisPool(new JedisPoolConfig(), shards); } AfterClass public static void tearDownAfterClass() throws Exception { jedis.disconnect(); sharding.disconnect(); pool.destroy(); } Test public void test1Normal() { long start System.currentTimeMillis(); for (int i 0; i 100000; i) { String result jedis.set(n i, n i); } long end System.currentTimeMillis(); System.out.println(Simple SET: ((end - start)/1000.0) seconds); } Test public void test2Trans() { long start System.currentTimeMillis(); Transaction tx jedis.multi(); for (int i 0; i 100000; i) { tx.set(t i, t i); } //System.out.println(tx.get(t1000).get()); ListObject results tx.exec(); long end System.currentTimeMillis(); System.out.println(Transaction SET: ((end - start)/1000.0) seconds); } Test public void test3Pipelined() { Pipeline pipeline jedis.pipelined(); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { pipeline.set(p i, p i); } //System.out.println(pipeline.get(p1000).get()); ListObject results pipeline.syncAndReturnAll(); long end System.currentTimeMillis(); System.out.println(Pipelined SET: ((end - start)/1000.0) seconds); } Test public void test4combPipelineTrans() { long start System.currentTimeMillis(); Pipeline pipeline jedis.pipelined(); pipeline.multi(); for (int i 0; i 100000; i) { pipeline.set( i, i); } pipeline.exec(); ListObject results pipeline.syncAndReturnAll(); long end System.currentTimeMillis(); System.out.println(Pipelined transaction: ((end - start)/1000.0) seconds); } Test public void test5shardNormal() { long start System.currentTimeMillis(); for (int i 0; i 100000; i) { String result sharding.set(sn i, n i); } long end System.currentTimeMillis(); System.out.println(SimpleSharing SET: ((end - start)/1000.0) seconds); } Test public void test6shardpipelined() { ShardedJedisPipeline pipeline sharding.pipelined(); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { pipeline.set(sp i, p i); } ListObject results pipeline.syncAndReturnAll(); long end System.currentTimeMillis(); System.out.println(PipelinedSharing SET: ((end - start)/1000.0) seconds); } Test public void test7shardSimplePool() { ShardedJedis one pool.getResource(); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { String result one.set(spn i, n i); } long end System.currentTimeMillis(); pool.returnResource(one); System.out.println(SimplePool SET: ((end - start)/1000.0) seconds); } Test public void test8shardPipelinedPool() { ShardedJedis one pool.getResource(); ShardedJedisPipeline pipeline one.pipelined(); long start System.currentTimeMillis(); for (int i 0; i 100000; i) { pipeline.set(sppn i, n i); } ListObject results pipeline.syncAndReturnAll(); long end System.currentTimeMillis(); pool.returnResource(one); System.out.println(PipelinedPool SET: ((end - start)/1000.0) seconds); } } 参考:http://www.open-open.com/lib/view/open1410485827242.html 转载于:https://www.cnblogs.com/songjinduo/p/5151139.html
