redis中Could not get a resource from the pool異常及解決方案

描述

這個錯誤產生的前提是這樣的,將數據存入redis(新安裝的)中,在通過連接池獲取jedis實例時,產生如下錯誤( Could not get a resource from the pool)。

分析

由於是新安裝的redis,配置文件沒有更改,低級的錯誤浪費不少時間,寫一篇文章,讓同樣犯這種錯誤的朋友別再浪費時間。

解決

更改配置文件 redis.conf 中兩處

1.將 bind 127.0.0.1 註釋掉

2.將 protected-mode 改為 no

bind 127.0.0.1 protected-mode
默認情況bind=127.0.0.1隻能接受本機的訪問請求不寫的情況下,無限制接受任何ip地址的訪問 如果開啟瞭protected-mode,那麼在沒有設定bind ip且沒有設密碼的情況下,Redis隻允許接受本機的相應

運行代碼

//創建jedis配置文件對象
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)
//創建連接池對象
var jedisPool:JedisPool = new JedisPool(jedisPoolConfig,"linux1",6379)
//獲取實例
jedisPool.getResource

報錯內容

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.最大鏈接數量超標,資源未回收jedis.close();//釋放資源

2.壓根redis服務沒有起 (很多人是這種)

3.可能是linux防火墻問題造成的 檢查網絡是否暢通

4.檢查IP地址或端口是否錯誤

總結

以上為個人經驗,希望能給大傢一個參考,也希望大傢多多支持WalkonNet。

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