描述

這個(gè)錯(cuò)誤產(chǎn)生的前提是這樣的，將數(shù)據(jù)存入redis（新安裝的）中，在通過連接池獲取jedis實(shí)例時(shí)，產(chǎn)生如下錯(cuò)誤（ Could not get a resource from the pool）。

分析

由于是新安裝的redis，配置文件沒有更改，低級(jí)的錯(cuò)誤浪費(fèi)不少時(shí)間，寫一篇文章，讓同樣犯這種錯(cuò)誤的朋友別再浪費(fèi)時(shí)間。

解決

更改配置文件 redis.conf 中兩處

1.將 bind 127.0.0.1 注釋掉

2.將 protected-mode 改為 no

運(yùn)行代碼

//創(chuàng)建jedis配置文件對(duì)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)
//創(chuàng)建連接池對(duì)象
var jedisPool：JedisPool = new JedisPool(jedisPoolConfig,"linux1",6379)
//獲取實(shí)例
jedisPool.getResource

報(bào)錯(cuò)內(nèi)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.最大鏈接數(shù)量超標(biāo)，資源未回收jedis.close();//釋放資源

2.壓根redis服務(wù)沒有起 （很多人是這種）

3.可能是linux防火墻問題造成的 檢查網(wǎng)絡(luò)是否暢通

4.檢查IP地址或端口是否錯(cuò)誤

總結(jié)

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。