redis中Could not get a resource from the pool异常及解决方案

描述

这个错误产生的前提是这样的，将数据存入redis（新安装的）中，在通过连接池获取jedis实例时，产生如下错误（ Could not get a resource from the pool）。

分析

由于是新安装的redis，配置文件没有更改，低级的错误浪费不少时间，写一篇文章，让同样犯这种错误的朋友别再浪费时间。

解决

更改配置文件 redis.conf 中两处

1.将 bind 127.0.0.1 注释掉

2.将 protected-mode 改为 no

运行代码

//创建jedis配置文件对象
val jedisPoolConfig = new JedisPoolConfig()
//添加配置信息
jedisPoolConfig.setMaxTotal(100)
jedisPoolConfig.setMaxIdle(20)
jedisPoolConfig.setMinIdle(0)
jedisPoolConfig.setBlockWhenExhausted(true)
jedisPoolConfig.setMaxWaitMillis(500)
jedisPoolConfig.setTestOnBorrow(true)
//创建连接池对象
var jedisPool：JedisPool = new JedisPool(jedisPoolConfig,"linux1",6379)
//获取实例
jedisPool.getResource

报错内容

ERROR --- [           Executor task launch worker for task 15]  org.apache.spark.executor.Executor                                              (line:   91)  :  Exception in task 7.0 in stage 2.0 (TID 15)
redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
    at redis.clients.util.Pool.getResource(Pool.java:53)
    at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226)
    at com.atguigu.bigdata.sparkmall.common.RedisUtil$.getJedisClient(RedisUtil.scala:26)
    at com.atguigu.bigdata.sparkmall.realtime.Req7TimeAdvertClickTrendApplication$$anonfun$main$1$$anonfun$apply$2.apply(Req7TimeAdvertClickTrendApplication.scala:54)
    at com.atguigu.bigdata.sparkmall.realtime.Req7TimeAdvertClickTrendApplication$$anonfun$main$1$$anonfun$apply$2.apply(Req7TimeAdvertClickTrendApplication.scala:53)
    at org.apache.spark.rdd.RDD$$anonfun$foreachPartition$1$$anonfun$apply$29.apply(RDD.scala:926)
    at org.apache.spark.rdd.RDD$$anonfun$foreachPartition$1$$anonfun$apply$29.apply(RDD.scala:926)
    at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1951)
    at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1951)
    at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
    at org.apache.spark.scheduler.Task.run(Task.scala:99)
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:322)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused: connect
    at redis.clients.jedis.Connection.connect(Connection.java:207)
    at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
    at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767)
    at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106)
    at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
    at redis.clients.util.Pool.getResource(Pool.java:49)
    ... 14 more
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at redis.clients.jedis.Connection.connect(Connection.java:184)
    ... 21 more

其他原因

1.最大链接数量超标，资源未回收jedis.close();//释放资源

2.压根redis服务没有起 （很多人是这种）

3.可能是linux防火墙问题造成的 检查网络是否畅通

4.检查IP地址或端口是否错误

总结

以上为个人经验，希望能给大家一个参考，也希望大家多多支持。