聊聊druid连接池的参数配置

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    本文主要研究一下druid连接池的参数配置

    DruidDataSourceFactory

    druid-1.2.11-sources.jar!/com/alibaba/druid/pool/DruidDataSourceFactory.java

    public class DruidDataSourceFactory implements ObjectFactory {
    private static final Log LOG = LogFactory.getLog(DruidDataSourceFactory.class);

    static final int UNKNOWN_TRANSACTIONISOLATION = -1;

    public static final String PROP_DEFAULTAUTOCOMMIT = "defaultAutoCommit";
    public static final String PROP_DEFAULTREADONLY = "defaultReadOnly";
    public static final String PROP_DEFAULTTRANSACTIONISOLATION = "defaultTransactionIsolation";
    public static final String PROP_DEFAULTCATALOG = "defaultCatalog";
    public static final String PROP_DRIVERCLASSNAME = "driverClassName";
    public static final String PROP_MAXACTIVE = "maxActive";
    public static final String PROP_MAXIDLE = "maxIdle";
    public static final String PROP_MINIDLE = "minIdle";
    public static final String PROP_INITIALSIZE = "initialSize";
    public static final String PROP_MAXWAIT = "maxWait";
    public static final String PROP_TESTONBORROW = "testOnBorrow";
    public static final String PROP_TESTONRETURN = "testOnReturn";
    public static final String PROP_TIMEBETWEENEVICTIONRUNSMILLIS = "timeBetweenEvictionRunsMillis";
    public static final String PROP_NUMTESTSPEREVICTIONRUN = "numTestsPerEvictionRun";
    public static final String PROP_MINEVICTABLEIDLETIMEMILLIS = "minEvictableIdleTimeMillis";
    public static final String PROP_PHY_TIMEOUT_MILLIS = "phyTimeoutMillis";
    public static final String PROP_TESTWHILEIDLE = "testWhileIdle";
    public static final String PROP_PASSWORD = "password";
    public static final String PROP_URL = "url";
    public static final String PROP_USERNAME = "username";
    public static final String PROP_VALIDATIONQUERY = "validationQuery";
    public static final String PROP_VALIDATIONQUERY_TIMEOUT = "validationQueryTimeout";
    public static final String PROP_INITCONNECTIONSQLS = "initConnectionSqls";
    public static final String PROP_ACCESSTOUNDERLYINGCONNECTIONALLOWED = "accessToUnderlyingConnectionAllowed";
    public static final String PROP_REMOVEABANDONED = "removeAbandoned";
    public static final String PROP_REMOVEABANDONEDTIMEOUT = "removeAbandonedTimeout";
    public static final String PROP_LOGABANDONED = "logAbandoned";
    public static final String PROP_POOLPREPAREDSTATEMENTS = "poolPreparedStatements";
    public static final String PROP_MAXOPENPREPAREDSTATEMENTS = "maxOpenPreparedStatements";
    public static final String PROP_CONNECTIONPROPERTIES = "connectionProperties";
    public static final String PROP_FILTERS = "filters";
    public static final String PROP_EXCEPTION_SORTER = "exceptionSorter";
    public static final String PROP_EXCEPTION_SORTER_CLASS_NAME = "exception-sorter-class-name";
    public static final String PROP_NAME = "name";
    public static final String PROP_INIT = "init";

    private static final String[] ALL_PROPERTIES = {
            PROP_DEFAULTAUTOCOMMIT,
            PROP_DEFAULTREADONLY,
            PROP_DEFAULTTRANSACTIONISOLATION,
            PROP_DEFAULTCATALOG,
            PROP_DRIVERCLASSNAME,
            PROP_MAXACTIVE,
            PROP_MAXIDLE,
            PROP_MINIDLE,
            PROP_INITIALSIZE,
            PROP_MAXWAIT,
            PROP_TESTONBORROW,
            PROP_TESTONRETURN,
            PROP_TIMEBETWEENEVICTIONRUNSMILLIS,
            PROP_NUMTESTSPEREVICTIONRUN,
            PROP_MINEVICTABLEIDLETIMEMILLIS,
            PROP_TESTWHILEIDLE,
            PROP_PASSWORD,
            PROP_FILTERS,
            PROP_URL,
            PROP_USERNAME,
            PROP_VALIDATIONQUERY,
            PROP_VALIDATIONQUERY_TIMEOUT,
            PROP_INITCONNECTIONSQLS,
            PROP_ACCESSTOUNDERLYINGCONNECTIONALLOWED,
            PROP_REMOVEABANDONED,
            PROP_REMOVEABANDONEDTIMEOUT,
            PROP_LOGABANDONED,
            PROP_POOLPREPAREDSTATEMENTS,
            PROP_MAXOPENPREPAREDSTATEMENTS,
            PROP_CONNECTIONPROPERTIES,
            PROP_EXCEPTION_SORTER,
            PROP_EXCEPTION_SORTER_CLASS_NAME,
            PROP_INIT,
            PROP_NAME,

            "druid.timeBetweenLogStatsMillis",
            "druid.stat.sql.MaxSize",
            "druid.clearFiltersEnable",
            "druid.resetStatEnable", //
            "druid.notFullTimeoutRetryCount", //
            "druid.maxWaitThreadCount", //
            "druid.failFast", //
            "druid.phyTimeoutMillis", //
            "druid.wall.tenantColumn", //
            "druid.wall.updateAllow", //
            "druid.wall.deleteAllow", //
            "druid.wall.insertAllow", //
            "druid.wall.selelctAllow", //
            "druid.wall.multiStatementAllow", //
    };

    //......
}
    DruidDataSourceFactory的ALL_PROPERTIES常量定义了所有支持的可配置项

    DruidDataSourceWrapper

    com/alibaba/druid/spring/boot/autoconfigure/DruidDataSourceWrapper.java

    @ConfigurationProperties("spring.datasource.druid")
public class DruidDataSourceWrapper extends DruidDataSource implements InitializingBean {
    @Autowired
    private DataSourceProperties basicProperties;

    @Override
    public void afterPropertiesSet() throws Exception {
        //if not found prefix 'spring.datasource.druid' jdbc properties ,'spring.datasource' prefix jdbc properties will be used.
        if (super.getUsername() == null) {
            super.setUsername(basicProperties.determineUsername());
        }
        if (super.getPassword() == null) {
            super.setPassword(basicProperties.determinePassword());
        }
        if (super.getUrl() == null) {
            super.setUrl(basicProperties.determineUrl());
        }
        if (super.getDriverClassName() == null) {
            super.setDriverClassName(basicProperties.getDriverClassName());
        }
    }

    @Autowired(required = false)
    public void autoAddFilters(List<Filter> filters){
        super.filters.addAll(filters);
    }

    /**
     * Ignore the 'maxEvictableIdleTimeMillis &lt; minEvictableIdleTimeMillis' validate,
     * it will be validated again in {@link DruidDataSource#init()}.
     *
     * for fix issue #3084, #2763
     *
     * @since 1.1.14
     */
    @Override
    public void setMaxEvictableIdleTimeMillis(long maxEvictableIdleTimeMillis) {
        try {
            super.setMaxEvictableIdleTimeMillis(maxEvictableIdleTimeMillis);
        } catch (IllegalArgumentException ignore) {
            super.maxEvictableIdleTimeMillis = maxEvictableIdleTimeMillis;
        }
    }
}
    DruidDataSourceWrapper继承了DruidDataSource，在afterPropertiesSet的时候会使用DataSourceProperties的username、password、url、driverClassName，其他配置在DruidDataSource中

    DruidDataSource

    com/alibaba/druid/pool/DruidDataSource.java

    public class DruidDataSource extends DruidAbstractDataSource implements DruidDataSourceMBean, ManagedDataSource, Referenceable, Closeable, Cloneable, ConnectionPoolDataSource, MBeanRegistration {

    private boolean                          useGlobalDataSourceStat   = false;
    private boolean                          logDifferentThread        = true;
    private volatile boolean                 keepAlive                 = false;
    private boolean                          asyncInit                 = false;
    protected boolean                        killWhenSocketReadTimeout = false;
    protected boolean                        checkExecuteTime          = false;        
}
    DruidDataSource继承了DruidAbstractDataSource，它只定义了keepAlive、asyncInit等几个配置，其它大部分配置在DruidAbstractDataSource中

    DruidAbstractDataSource

    com/alibaba/druid/pool/DruidAbstractDataSource.java

    public abstract class DruidAbstractDataSource extends WrapperAdapter implements DruidAbstractDataSourceMBean, DataSource, DataSourceProxy, Serializable {
    protected volatile int initialSize = DEFAULT_INITIAL_SIZE;
    public static final int DEFAULT_INITIAL_SIZE = 0;

    protected volatile int maxActive = DEFAULT_MAX_ACTIVE_SIZE;
    public static final int DEFAULT_MAX_ACTIVE_SIZE = 8;

    protected volatile int minIdle = DEFAULT_MIN_IDLE;
    public static final int DEFAULT_MIN_IDLE = 0;

    protected volatile int maxIdle = DEFAULT_MAX_IDLE;
    public static final int DEFAULT_MAX_IDLE = 8;

    protected volatile long maxWait = DEFAULT_MAX_WAIT;
    public static final int DEFAULT_MAX_WAIT = -1;

    protected volatile String validationQuery = DEFAULT_VALIDATION_QUERY;
    public static final String DEFAULT_VALIDATION_QUERY = null;   

    protected volatile int validationQueryTimeout = -1;

    protected volatile boolean testOnBorrow = DEFAULT_TEST_ON_BORROW;
    public static final boolean DEFAULT_TEST_ON_BORROW = false;

    protected volatile boolean testOnReturn = DEFAULT_TEST_ON_RETURN;
    public static final boolean DEFAULT_TEST_ON_RETURN = false;

    protected volatile boolean testWhileIdle = DEFAULT_WHILE_IDLE;
    public static final boolean DEFAULT_WHILE_IDLE = true;

    protected volatile int maxPoolPreparedStatementPerConnectionSize = 10;

    protected volatile long timeBetweenEvictionRunsMillis = DEFAULT_TIME_BETWEEN_EVICTION_RUNS_MILLIS;
    public static final long DEFAULT_TIME_BETWEEN_EVICTION_RUNS_MILLIS = 60 * 1000L;

    protected volatile int numTestsPerEvictionRun = DEFAULT_NUM_TESTS_PER_EVICTION_RUN;
    public static final int DEFAULT_NUM_TESTS_PER_EVICTION_RUN = 3;

    protected volatile long minEvictableIdleTimeMillis = DEFAULT_MIN_EVICTABLE_IDLE_TIME_MILLIS;
    public static final long DEFAULT_MIN_EVICTABLE_IDLE_TIME_MILLIS = 1000L * 60L * 30L;

    protected volatile long maxEvictableIdleTimeMillis = DEFAULT_MAX_EVICTABLE_IDLE_TIME_MILLIS;
    public static final long DEFAULT_MAX_EVICTABLE_IDLE_TIME_MILLIS = 1000L * 60L * 60L * 7;

    protected volatile long keepAliveBetweenTimeMillis = DEFAULT_TIME_BETWEEN_EVICTION_RUNS_MILLIS * 2;

    protected volatile long phyTimeoutMillis = DEFAULT_PHY_TIMEOUT_MILLIS;
    public static final long DEFAULT_PHY_TIMEOUT_MILLIS = -1;

    protected volatile long timeBetweenConnectErrorMillis = DEFAULT_TIME_BETWEEN_CONNECT_ERROR_MILLIS;
    public static final long DEFAULT_TIME_BETWEEN_CONNECT_ERROR_MILLIS = 500;

}
    DruidAbstractDataSource定义的配置及其默认值如下
    类别配置项默认值说明
    数量initialSize0-
    数量maxActive8-
    数量minIdle0-
    数量maxIdle8-
    数量maxPoolPreparedStatementPerConnectionSize10-
    健康检测validationQuerynullmysql默认为SELECT 1
    健康检测validationQueryTimeout-1单位秒，mysql默认1s
    健康检测testOnBorrowfalse-
    健康检测testOnReturnfalse-
    健康检测testOnReturnfalse-
    健康检测testWhileIdletrue-
    evicttimeBetweenEvictionRunsMillis60s-
    evictnumTestsPerEvictionRun3-
    evictminEvictableIdleTimeMillis30分钟-
    evictmaxEvictableIdleTimeMillis7小时-
    超时maxWait-1单位毫秒
    超时keepAliveBetweenTimeMillis120s2* DEFAULT_TIME_BETWEEN_EVICTION_RUNS_MILLIS
    超时phyTimeoutMillis-1-
    超时queryTimeout0-
    超时transactionQueryTimeout0-
    错误timeBetweenConnectErrorMillis500ms-
    连接泄露removeAbandonedfalse-
    连接泄露removeAbandonedTimeoutMillis300s-
    获取连接时，若maxWait大于0则走的pollLast(nanos)，其中maxWait是作为notEmpty.awaitNanos参数，毫秒转为nacos，若为负数则取0；若maxWait小于等于0则走的takeLast，执行的是notEmpty.await()，即阻塞等待

    小结

    druid连接池的配置主要是在DruidDataSource中，而DruidDataSource继承了DruidAbstractDataSource，它只定义了keepAlive、asyncInit等几个配置，其它大部分配置在DruidAbstractDataSource中，没有单独的一个配置类，然后默认只开启了testWhileIdle，maxWait默认为-1；因而建议强制配置maxWait为正数(单位毫秒)；在并发量比较大的场景，若要保证连接池的稳定数量则可以将minIdle配置为与maxIdle一样。

    druid
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