序
Spring-Boot-2.0.0-M1版本将默认的数据库连接池从tomcat jdbc pool改为了hikari，这里主要研究下hikari的默认配置
spring-configuration-metadata.json
spring-boot-autoconfigure-2.0.0.M7.jar!/META-INF/spring-configuration-metadata.json
{
"sourceType": "org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari",
"name": "spring.datasource.hikari",
"sourceMethod": "dataSource(org.springframework.boot.autoconfigure.jdbc.DataSourceProperties)",
"type": "com.zaxxer.hikari.HikariDataSource"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.allow-pool-suspension",
"type": "java.lang.Boolean"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.auto-commit",
"type": "java.lang.Boolean"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.catalog",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.connection-init-sql",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.connection-test-query",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.connection-timeout",
"type": "java.lang.Long"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.data-source-class-name",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.data-source-j-n-d-i",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.data-source-properties",
"type": "java.util.Properties"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.driver-class-name",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.health-check-properties",
"type": "java.util.Properties"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.health-check-registry",
"type": "java.lang.Object"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.idle-timeout",
"type": "java.lang.Long"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"deprecated": true,
"name": "spring.datasource.hikari.initialization-fail-fast", //initializationFailTimeout > 0
"type": "java.lang.Boolean",
"deprecation": {}
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.initialization-fail-timeout",
"type": "java.lang.Long"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.isolate-internal-queries",
"type": "java.lang.Boolean"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.jdbc-url",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"deprecated": true,
"name": "spring.datasource.hikari.jdbc4-connection-test", //废弃
"type": "java.lang.Boolean",
"deprecation": {}
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.leak-detection-threshold",
"type": "java.lang.Long"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.login-timeout", //在HikariDataSource及PoolBase中
"type": "java.lang.Integer"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.max-lifetime",
"type": "java.lang.Long"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.maximum-pool-size",
"type": "java.lang.Integer"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.metric-registry",
"type": "java.lang.Object"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.metrics-tracker-factory",
"type": "com.zaxxer.hikari.metrics.MetricsTrackerFactory"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.minimum-idle",
"type": "java.lang.Integer"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.password",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.pool-name",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.read-only",
"type": "java.lang.Boolean"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.register-mbeans",
"type": "java.lang.Boolean"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.scheduled-executor",
"type": "java.util.concurrent.ScheduledExecutorService"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"deprecated": true,
"name": "spring.datasource.hikari.scheduled-executor-service",
"type": "java.util.concurrent.ScheduledThreadPoolExecutor",
"deprecation": {}
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.schema",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.transaction-isolation", //transactionIsolationName
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.username",
"type": "java.lang.String"
},
{
"sourceType": "com.zaxxer.hikari.HikariDataSource",
"name": "spring.datasource.hikari.validation-timeout",
"type": "java.lang.Long"
},
复制代码HikariConfig
HikariCP-2.7.6-sources.jar!/com/zaxxer/hikari/HikariConfig.java
@SuppressWarnings({"SameParameterValue", "unused"})
public class HikariConfig implements HikariConfigMXBean
{
private static final Logger LOGGER = LoggerFactory.getLogger(HikariConfig.class);
private static final char[] ID_CHARACTERS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
private static final long CONNECTION_TIMEOUT = SECONDS.toMillis(30);
private static final long VALIDATION_TIMEOUT = SECONDS.toMillis(5);
private static final long IDLE_TIMEOUT = MINUTES.toMillis(10);
private static final long MAX_LIFETIME = MINUTES.toMillis(30);
private static final int DEFAULT_POOL_SIZE = 10;
//......
/**
* Default constructor
*/
public HikariConfig()
{
dataSourceProperties = new Properties();
healthCheckProperties = new Properties();
minIdle = -1;
maxPoolSize = -1;
maxLifetime = MAX_LIFETIME;
connectionTimeout = CONNECTION_TIMEOUT;
validationTimeout = VALIDATION_TIMEOUT;
idleTimeout = IDLE_TIMEOUT;
initializationFailTimeout = 1;
isAutoCommit = true;
String systemProp = System.getProperty("hikaricp.configurationFile");
if (systemProp != null) {
loadProperties(systemProp);
}
}
@Override
public void setConnectionTimeout(long connectionTimeoutMs)
{
if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started. Use HikariConfigMXBean for runtime changes.");
if (connectionTimeoutMs == 0) {
this.connectionTimeout = Integer.MAX_VALUE;
}
else if (connectionTimeoutMs < 250) {
throw new IllegalArgumentException("connectionTimeout cannot be less than 250ms");
}
else {
this.connectionTimeout = connectionTimeoutMs;
}
}
@Override
public void setIdleTimeout(long idleTimeoutMs)
{
if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started. Use HikariConfigMXBean for runtime changes.");
if (idleTimeoutMs < 0) {
throw new IllegalArgumentException("idleTimeout cannot be negative");
}
this.idleTimeout = idleTimeoutMs;
}
@Override
public void setMaximumPoolSize(int maxPoolSize)
{
if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started. Use HikariConfigMXBean for runtime changes.");
if (maxPoolSize < 1) {
throw new IllegalArgumentException("maxPoolSize cannot be less than 1");
}
this.maxPoolSize = maxPoolSize;
}
@Override
public void setMinimumIdle(int minIdle)
{
if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started. Use HikariConfigMXBean for runtime changes.");
if (minIdle < 0) {
throw new IllegalArgumentException("minimumIdle cannot be negative");
}
this.minIdle = minIdle;
}
@Override
public void setValidationTimeout(long validationTimeoutMs)
{
if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started. Use HikariConfigMXBean for runtime changes.");
if (validationTimeoutMs < 250) {
throw new IllegalArgumentException("validationTimeout cannot be less than 250ms");
}
this.validationTimeout = validationTimeoutMs;
}
public void validate()
{
if (poolName == null) {
poolName = generatePoolName();
}
else if (isRegisterMbeans && poolName.contains(":")) {
throw new IllegalArgumentException("poolName cannot contain ':' when used with JMX");
}
// treat empty property as null
catalog = getNullIfEmpty(catalog);
connectionInitSql = getNullIfEmpty(connectionInitSql);
connectionTestQuery = getNullIfEmpty(connectionTestQuery);
transactionIsolationName = getNullIfEmpty(transactionIsolationName);
dataSourceClassName = getNullIfEmpty(dataSourceClassName);
dataSourceJndiName = getNullIfEmpty(dataSourceJndiName);
driverClassName = getNullIfEmpty(driverClassName);
jdbcUrl = getNullIfEmpty(jdbcUrl);
// Check Data Source Options
if (dataSource != null) {
if (dataSourceClassName != null) {
LOGGER.warn("{} - using dataSource and ignoring dataSourceClassName.", poolName);
}
}
else if (dataSourceClassName != null) {
if (driverClassName != null) {
LOGGER.error("{} - cannot use driverClassName and dataSourceClassName together.", poolName);
// NOTE: This exception text is referenced by a Spring Boot FailureAnalyzer, it should not be
// changed without first notifying the Spring Boot developers.
throw new IllegalStateException("cannot use driverClassName and dataSourceClassName together.");
}
else if (jdbcUrl != null) {
LOGGER.warn("{} - using dataSourceClassName and ignoring jdbcUrl.", poolName);
}
}
else if (jdbcUrl != null || dataSourceJndiName != null) {
// ok
}
else if (driverClassName != null) {
LOGGER.error("{} - jdbcUrl is required with driverClassName.", poolName);
throw new IllegalArgumentException("jdbcUrl is required with driverClassName.");
}
else {
LOGGER.error("{} - dataSource or dataSourceClassName or jdbcUrl is required.", poolName);
throw new IllegalArgumentException("dataSource or dataSourceClassName or jdbcUrl is required.");
}
validateNumerics();
if (LOGGER.isDebugEnabled() || unitTest) {
logConfiguration();
}
}
private void validateNumerics()
{
if (maxLifetime != 0 && maxLifetime < SECONDS.toMillis(30)) {
LOGGER.warn("{} - maxLifetime is less than 30000ms, setting to default {}ms.", poolName, MAX_LIFETIME);
maxLifetime = MAX_LIFETIME;
}
if (idleTimeout + SECONDS.toMillis(1) > maxLifetime && maxLifetime > 0) {
LOGGER.warn("{} - idleTimeout is close to or more than maxLifetime, disabling it.", poolName);
idleTimeout = 0;
}
if (idleTimeout != 0 && idleTimeout < SECONDS.toMillis(10)) {
LOGGER.warn("{} - idleTimeout is less than 10000ms, setting to default {}ms.", poolName, IDLE_TIMEOUT);
idleTimeout = IDLE_TIMEOUT;
}
if (leakDetectionThreshold > 0 && !unitTest) {
if (leakDetectionThreshold < SECONDS.toMillis(2) || (leakDetectionThreshold > maxLifetime && maxLifetime > 0)) {
LOGGER.warn("{} - leakDetectionThreshold is less than 2000ms or more than maxLifetime, disabling it.", poolName);
leakDetectionThreshold = 0;
}
}
if (connectionTimeout < 250) {
LOGGER.warn("{} - connectionTimeout is less than 250ms, setting to {}ms.", poolName, CONNECTION_TIMEOUT);
connectionTimeout = CONNECTION_TIMEOUT;
}
if (validationTimeout < 250) {
LOGGER.warn("{} - validationTimeout is less than 250ms, setting to {}ms.", poolName, VALIDATION_TIMEOUT);
validationTimeout = VALIDATION_TIMEOUT;
}
if (maxPoolSize < 1) {
maxPoolSize = (minIdle <= 0) ? DEFAULT_POOL_SIZE : minIdle;
}
if (minIdle < 0 || minIdle > maxPoolSize) {
minIdle = maxPoolSize;
}
}
}
复制代码可以看到在set方法添加了参数校验，同时在configuration的构造器以及getConnection方法中也调用了validate方法
public HikariDataSource(HikariConfig configuration)
{
configuration.validate();
configuration.copyStateTo(this);
this.seal();
LOGGER.info("{} - Starting...", configuration.getPoolName());
pool = fastPathPool = new HikariPool(this);
LOGGER.info("{} - Start completed.", configuration.getPoolName());
}
/** {@inheritDoc} */
@Override
public Connection getConnection() throws SQLException
{
if (isClosed()) {
throw new SQLException("HikariDataSource " + this + " has been closed.");
}
if (fastPathPool != null) {
return fastPathPool.getConnection();
}
// See http://en.wikipedia.org/wiki/Double-checked_locking#Usage_in_Java
HikariPool result = pool;
if (result == null) {
synchronized (this) {
result = pool;
if (result == null) {
validate();
LOGGER.info("{} - Starting...", getPoolName());
try {
pool = result = new HikariPool(this);
this.seal();
}
catch (PoolInitializationException pie) {
if (pie.getCause() instanceof SQLException) {
throw (SQLException) pie.getCause();
}
else {
throw pie;
}
}
LOGGER.info("{} - Start completed.", getPoolName());
}
}
}
return result.getConnection();
}
复制代码springboot的autoconfig是采用BeanUtils的反射来初始化HikariDataSource，走的是默认构造器，因此校验就依赖set方法以及后续的getConnection方法。
PoolBase.setLoginTimeout
HikariCP-2.7.6-sources.jar!/com/zaxxer/hikari/pool/PoolBase.java
/**
* Set the loginTimeout on the specified DataSource.
*
* @param dataSource the DataSource
*/
private void setLoginTimeout(final DataSource dataSource)
{
if (connectionTimeout != Integer.MAX_VALUE) {
try {
dataSource.setLoginTimeout(Math.max(1, (int) MILLISECONDS.toSeconds(500L + connectionTimeout)));
}
catch (Throwable e) {
LOGGER.info("{} - Failed to set login timeout for data source. ({})", poolName, e.getMessage());
}
}
}
复制代码这个在初始化的时候设定了loginTimeout，初始值为Math.max(1, (int) MILLISECONDS.toSeconds(500L + connectionTimeout))
小结
springboot的HikariDataSource默认配置的默认值如下
| name | 构造器默认值 | 默认配置validate之后的值 | validate重置 |
|---|---|---|---|
| minIdle | -1 | 10 | minIdle<0或者minIdle>maxPoolSize,则被重置为maxPoolSize |
| maxPoolSize | -1 | 10 | 如果maxPoolSize小于1，则会被重置。当minIdle<=0被重置为DEFAULT_POOL_SIZE则为10;如果minIdle>0则重置为minIdle的值 |
| maxLifetime | MINUTES.toMillis(30) = 1800000 | 1800000 | 如果不等于0且小于30秒则会被重置回30分钟 |
| connectionTimeout | SECONDS.toMillis(30) = 30000 | 30000 | 如果小于250毫秒，则被重置回30秒 |
| validationTimeout | SECONDS.toMillis(5) = 5000 | 5000 | 如果小于250毫秒，则会被重置回5秒 |
| loginTimeout | 10 | 30 | Math.max(1, (int) MILLISECONDS.toSeconds(500L + connectionTimeout))，为connectionTimeout+500ms转为秒数取整 与 1 取最大者 |
| idleTimeout | MINUTES.toMillis(10) = 600000 | 600000 | 如果idleTimeout+1秒>maxLifetime 且 maxLifetime>0，则会被重置为0；如果idleTimeout!=0且小于10秒，则会被重置为10秒 |
| leakDetectionThreshold | 0 | 0 | 如果大于0且不是单元测试，则进一步判断：(leakDetectionThreshold < SECONDS.toMillis(2) or (leakDetectionThreshold > maxLifetime && maxLifetime > 0)，会被重置为0 . 即如果要生效则必须>0，而且不能小于2秒，而且当maxLifetime > 0时不能大于maxLifetime |
| initializationFailTimeout | 1 | 1 | - |
| isAutoCommit | true | true | - |
| isReadOnly | false | fasle | - |
| isAllowPoolSuspension | false | false | - |
| isIsolateInternalQueries | false | false | - |
| isRegisterMbeans | false | false | - |
| sealed | false | true | 运行启动后这个标志为true，表示不再运行修改 |
| poolName | null | HikariPool-1 | - |
| catalog | null | null | - |
| connectionInitSql | null | null | - |
| connectionTestQuery | null | null | - |
| dataSourceClassName | null | null | - |
| schema | null | null | - |
| transactionIsolationName | null | null | - |
| dataSource | null | null | - |
| dataSourceProperties | {} | {} | - |
| threadFactory | null | null | - |
| scheduledExecutor | null | null | - |
| metricsTrackerFactory | null | null | - |
| metricRegistry | null | null | - |
| healthCheckRegistry | null | null | - |
| healthCheckProperties | {} | {} | - |
doc
- Spring-Boot-2.0.0-M1-Release-Notes