使用hikari连接池时如何解决"Socket read timed out"

Question

我正在开发一个应用程序，使用 play 框架（2.8.0 版），java（1.8 版）和 oracle 数据库（12C 版）。

一天内只有零次或一次访问数据库，我遇到以下错误。

java.sql.SQLRecoverableException: IO Error: Socket read timed out
    at oracle.jdbc.driver.T4CConnection.logoff(T4CConnection.java:919)
    at oracle.jdbc.driver.PhysicalConnection.close(PhysicalConnection.java:2005)
    at com.zaxxer.hikari.pool.PoolBase.quietlyCloseConnection(PoolBase.java:138)
    at com.zaxxer.hikari.pool.HikariPool.lambda$closeConnection(HikariPool.java:447)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.SocketTimeoutException: Socket read timed out
    at oracle.net.nt.TimeoutSocketChannel.read(TimeoutSocketChannel.java:174)
    at oracle.net.ns.NIOHeader.readHeaderBuffer(NIOHeader.java:82)
    at oracle.net.ns.NIOPacket.readFromSocketChannel(NIOPacket.java:139)
    at oracle.net.ns.NIOPacket.readFromSocketChannel(NIOPacket.java:101)
    at oracle.net.ns.NIONSDataChannel.readDataFromSocketChannel(NIONSDataChannel.java:80)
    at oracle.jdbc.driver.T4CMAREngineNIO.prepareForReading(T4CMAREngineNIO.java:98)
    at oracle.jdbc.driver.T4CMAREngineNIO.unmarshalUB1(T4CMAREngineNIO.java:534)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:485)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:252)
    at oracle.jdbc.driver.T4C7Ocommoncall.doOLOGOFF(T4C7Ocommoncall.java:62)
    at oracle.jdbc.driver.T4CConnection.logoff(T4CConnection.java:908)
    ... 6 common frames omitted

db {
default {
driver=oracle.jdbc.OracleDriver
url="jdbc:oracle:thin:@XXX.XXX.XXX.XX:XXXX/XXXXXXX"
username="XXXXXXXXX"
password="XXXXXXXXX"
hikaricp {
  dataSource {
    cachePrepStmts = true
    prepStmtCacheSize = 250
    prepStmtCacheSqlLimit = 2048
      }
     }
  }
}

这似乎是由于数据库连接不活动造成的，我该如何解决？如果需要任何其他信息，请告诉我？

Answer 1

您可以为 JDBC 启用 TCP keepalive - 可以通过设置指令或在连接字符串中添加“ENABLE=BROKEN”来实现。

通常 Cisco/Juniper 当 TCP 连接处于非活动状态的时间超过一个小时时会切断它。
虽然 Linux 内核在两小时后开始发送保活探测 (tcp_keepalive_time)。因此，如果您决定打开 tcp keepalive，您还需要 root 权限，才能将此内核可调参数更改为较低的值（10-15 分钟）
此外，HikariCP 不应保持打开任何连接超过 30 分钟 - 默认情况下。

所以如果你的FW、Linux内核和HikariCP都使用默认设置，那么你的系统应该不会出现这个错误。

参见 HikariCP official documentation

maxLifetime: This property controls the maximum lifetime of a connection in the pool. An in-use connection will never be retired, only when it is closed will it then be removed. On a connection-by-connection basis, minor negative attenuation is applied to avoid mass-extinction in the pool. We strongly recommend setting this value, and it should be several seconds shorter than any database or infrastructure imposed connection time limit. A value of 0 indicates no maximum lifetime (infinite lifetime), subject of course to the idleTimeout setting. The minimum allowed value is 30000ms (30 seconds). Default: 1800000 (30 minutes)

Answer 2

我在配置文件中为 hickaricp 添加了以下配置，它是工作正常。

## Database Connection Pool

play.db.pool = hikaricp
play.db.prototype.hikaricp.connectionTimeout=120000
play.db.prototype.hikaricp.idleTimeout=15000
play.db.prototype.hikaricp.leakDetectionThreshold=120000
play.db.prototype.hikaricp.validationTimeout=10000
play.db.prototype.hikaricp.maxLifetime=120000

使用hikari连接池时如何解决"Socket read timed out"

How to solve "Socket read timed out" when using hikari connection pool

java

database

playframework

oracle12c

socket-timeout-exception