feat: Adding a connection pool to reduce the time spent opening connection to Postgres

access-control-service/LICENSE-binary

@@ -247,6 +247,7 @@ Scala/Java jars:
   - com.thesamet.scalapb.scalapb-runtime_2.13-0.11.20.jar
   - com.typesafe.config-1.4.6.jar
   - com.typesafe.scala-logging.scala-logging_2.13-3.9.5.jar
+  - com.zaxxer.HikariCP-5.1.0.jar
   - io.dropwizard.dropwizard-auth-4.0.7.jar
   - io.dropwizard.dropwizard-configuration-4.0.7.jar
   - io.dropwizard.dropwizard-core-4.0.7.jar

common/dao/build.sbt

@@ -175,4 +175,5 @@ libraryDependencies ++= Seq(
 
 libraryDependencies ++= Seq(
   "org.postgresql" % "postgresql" % "42.7.4",
+  "com.zaxxer"     % "HikariCP"  % "5.1.0"
 )

common/dao/src/main/scala/org/apache/texera/dao/SqlServer.scala

@@ -19,39 +19,59 @@
 
 package org.apache.texera.dao
 
+import com.zaxxer.hikari.{HikariConfig, HikariDataSource}
 import org.jooq.impl.DSL
 import org.jooq.{DSLContext, SQLDialect}
-import org.postgresql.ds.PGSimpleDataSource
 
 /**
   * SqlServer class that manages a connection to a PostgreSQL database using jOOQ.
   *
+  * Uses a HikariCP connection pool so that every jOOQ query borrows a pre-authenticated
+  * connection from the pool rather than opening a new TCP + SCRAM handshake each time.
+  *
   * WARNING: Do not cache the DSLContext returned by `createDSLContext()` in a val or lazy val.
   * During testing, `MockTexeraDB` replaces the SqlServer instance between test classes.
   * A cached DSLContext will hold a stale reference to a dead database connection from a previous test class,
   * causing "Connection refused" errors when tests run together.
   * Use `def` to ensure the connection is looked up each time.
   *
-  * @param url The database connection URL.
-  * @param user The username for authenticating with the database.
+  * @param url      The JDBC connection URL.
+  * @param user     The username for authenticating with the database.
   * @param password The password for authenticating with the database.
   */
 class SqlServer private (url: String, user: String, password: String) {
   val SQL_DIALECT: SQLDialect = SQLDialect.POSTGRES
-  private val dataSource: PGSimpleDataSource = new PGSimpleDataSource()
-  var context: DSLContext = {
-    dataSource.setUrl(url)
-    dataSource.setUser(user)
-    dataSource.setPassword(password)
-    dataSource.setConnectTimeout(5)
-    DSL.using(dataSource, SQL_DIALECT)
+
+  private val hikariConfig: HikariConfig = {
+    val cfg = new HikariConfig()
+    cfg.setJdbcUrl(url)
+    cfg.setUsername(user)
+    cfg.setPassword(password)
+    cfg.setPoolName("texera-hikari")
+    cfg.setMaximumPoolSize(10)
+    cfg.setMinimumIdle(2)
+    // How long a caller waits for a connection before throwing (ms)
+    cfg.setConnectionTimeout(30000)
+    // How long an idle connection stays in the pool before being retired (ms)
+    cfg.setIdleTimeout(600000)
+    // Maximum lifetime of any connection in the pool (ms); must be < PostgreSQL's idle timeout
+    cfg.setMaxLifetime(1800000)
+    cfg
   }
 
+  private val dataSource: HikariDataSource = new HikariDataSource(hikariConfig)
+
+  var context: DSLContext = DSL.using(dataSource, SQL_DIALECT)
+
   def createDSLContext(): DSLContext = context
 
   def replaceDSLContext(newContext: DSLContext): Unit = {
     context = newContext
   }
+
+  def close(): Unit = {
+    if (!dataSource.isClosed) dataSource.close()
+  }
 }
 
 object SqlServer {
@@ -68,10 +88,6 @@ object SqlServer {
     instance.get
   }
 
-  def clearInstance(): Unit = {
-    instance = None
-  }
-
   /**
     * A utility function for create a transaction block using given sql context
     * @param dsl the sql context

common/dao/src/test/scala/org/apache/texera/dao/MockTexeraDB.scala

@@ -67,7 +67,6 @@ trait MockTexeraDB {
         value.close()
         dbInstance = None
         dslContext = None
-        SqlServer.clearInstance()
       case None =>
       // do nothing
     }

common/dao/src/test/scala/org/apache/texera/dao/SqlServerSpec.scala

@@ -0,0 +1,196 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.texera.dao
+
+import com.zaxxer.hikari.{HikariConfig, HikariDataSource}
+import org.jooq.impl.DSL
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+import org.scalatest.{BeforeAndAfterAll}
+
+class SqlServerSpec
+    extends AnyFlatSpec
+    with Matchers
+    with BeforeAndAfterAll
+    with MockTexeraDB {
+
+  override def beforeAll(): Unit = initializeDBAndReplaceDSLContext()
+  override def afterAll(): Unit = shutdownDB()
+
+  // -------------------------------------------------------------------------
+  // SqlServer.withTransaction
+  //
+  // getDSLContext is backed by the embedded Postgres DataSource, so each
+  // top-level query borrows a connection from the pool.  withTransaction
+  // binds a single connection for the duration of the block, making rollback
+  // and commit behaviour fully observable.
+  // -------------------------------------------------------------------------
+
+  "SqlServer.withTransaction" should "return the value produced by the block" in {
+    val result = SqlServer.withTransaction(getDSLContext) { _ => 42 }
+    result shouldBe 42
+  }
+
+  it should "commit the block's work so subsequent queries observe the changes" in {
+    // SELECT 1 is a lightweight live query; completing without error confirms
+    // the transaction committed and the connection was returned cleanly.
+    val result = SqlServer.withTransaction(getDSLContext) { ctx =>
+      ctx.selectOne().fetchOne().value1()
+    }
+    result shouldBe 1
+  }
+
+  it should "re-throw the exception when the block throws" in {
+    val boom = new RuntimeException("intentional failure")
+    val thrown = intercept[RuntimeException] {
+      SqlServer.withTransaction(getDSLContext) { _ => throw boom }
+    }
+    thrown.getMessage should include("intentional failure")
+  }
+
+  it should "roll back all DML in the block when an exception is thrown" in {
+    // A permanent (non-TEMP) table is used so every connection from the pool
+    // can see it; TEMP tables are session-scoped and would be invisible across
+    // pool connections.
+    val dsl = getDSLContext
+    dsl.execute("CREATE TABLE IF NOT EXISTS _txn_rollback_test (v INT)")
+    try {
+      intercept[RuntimeException] {
+        SqlServer.withTransaction(dsl) { ctx =>
+          ctx.execute("INSERT INTO _txn_rollback_test VALUES (99)")
+          throw new RuntimeException("force rollback")
+        }
+      }
+      // The INSERT was inside the rolled-back transaction, so the table must
+      // still be empty.
+      dsl.fetchCount(DSL.table(DSL.name("_txn_rollback_test"))) shouldBe 0
+    } finally {
+      dsl.execute("DROP TABLE IF EXISTS _txn_rollback_test")
+    }
+  }
+
+  it should "support nested return types beyond Int" in {
+    val result = SqlServer.withTransaction(getDSLContext) { ctx =>
+      ctx.selectOne().fetchOne().value1().toString
+    }
+    result shouldBe "1"
+  }
+
+  // -------------------------------------------------------------------------
+  // HikariCP pool lifecycle and configuration
+  //
+  // These tests create their own HikariDataSource against the embedded Postgres
+  // instance so they can drive the pool directly, independently of the
+  // DSLContext replacement that MockTexeraDB applies for its own queries.
+  // -------------------------------------------------------------------------
+
+  private def buildPool(maxSize: Int = 5, minIdle: Int = 1, poolName: String = "spec-pool"): HikariDataSource = {
+    // Use the default "postgres" database so no schema setup is needed.
+    val jdbcUrl = getDBInstance.getJdbcUrl("postgres", "postgres")
+    val cfg = new HikariConfig()
+    cfg.setJdbcUrl(jdbcUrl)
+    cfg.setUsername("postgres")
+    cfg.setPassword("")
+    cfg.setPoolName(poolName)
+    cfg.setMaximumPoolSize(maxSize)
+    cfg.setMinimumIdle(minIdle)
+    cfg.setConnectionTimeout(5000)
+    new HikariDataSource(cfg)
+  }
+
+  "HikariCP pool" should "provide a usable connection that can execute queries" in {
+    val ds = buildPool()
+    try {
+      val conn = ds.getConnection
+      try {
+        val rs = conn.prepareStatement("SELECT 1").executeQuery()
+        rs.next() shouldBe true
+        rs.getInt(1) shouldBe 1
+      } finally conn.close()
+    } finally ds.close()
+  }
+
+  it should "apply the configured pool name" in {
+    val ds = buildPool(poolName = "my-named-pool")
+    try {
+      ds.getHikariConfigMXBean.getPoolName shouldBe "my-named-pool"
+    } finally ds.close()
+  }
+
+  it should "apply the configured maximum pool size" in {
+    val ds = buildPool(maxSize = 7)
+    try {
+      ds.getHikariConfigMXBean.getMaximumPoolSize shouldBe 7
+    } finally ds.close()
+  }
+
+  it should "apply the configured minimum idle connections" in {
+    val ds = buildPool(minIdle = 2)
+    try {
+      ds.getHikariConfigMXBean.getMinimumIdle shouldBe 2
+    } finally ds.close()
+  }
+
+  it should "count a borrowed connection as active" in {
+    val ds = buildPool()
+    try {
+      val conn = ds.getConnection
+      try {
+        ds.getHikariPoolMXBean.getActiveConnections should be >= 1
+      } finally conn.close()
+    } finally ds.close()
+  }
+
+  it should "decrement active count and increment idle count once a connection is returned" in {
+    val ds = buildPool()
+    try {
+      val conn = ds.getConnection
+      conn.close()
+      ds.getHikariPoolMXBean.getActiveConnections shouldBe 0
+      ds.getHikariPoolMXBean.getIdleConnections should be >= 1
+    } finally ds.close()
+  }
+
+  it should "allow up to the maximum pool size connections to be borrowed concurrently" in {
+    val ds = buildPool(maxSize = 3)
+    try {
+      val c1 = ds.getConnection
+      val c2 = ds.getConnection
+      val c3 = ds.getConnection
+      ds.getHikariPoolMXBean.getActiveConnections shouldBe 3
+      c1.close(); c2.close(); c3.close()
+    } finally ds.close()
+  }
+
+  it should "report isClosed as false while open and true after close" in {
+    val ds = buildPool()
+    ds.isClosed shouldBe false
+    ds.close()
+    ds.isClosed shouldBe true
+  }
+
+  it should "reject getConnection after the pool has been closed" in {
+    val ds = buildPool()
+    ds.close()
+    // HikariCP throws an SQLException (wrapped as RuntimeException by the pool)
+    // when a caller tries to borrow from a closed pool.
+    assertThrows[Exception](ds.getConnection)
+  }
+}

computing-unit-managing-service/LICENSE-binary

@@ -274,6 +274,7 @@ Scala/Java jars:
   - com.typesafe.play.play-functional_2.13-2.10.6.jar
   - com.typesafe.play.play-json_2.13-2.10.6.jar
   - com.typesafe.scala-logging.scala-logging_2.13-3.9.5.jar
+  - com.zaxxer.HikariCP-5.1.0.jar
   - commons-beanutils.commons-beanutils-1.9.4.jar
   - commons-cli.commons-cli-1.2.jar
   - commons-codec.commons-codec-1.17.1.jar

config-service/LICENSE-binary

@@ -247,6 +247,7 @@ Scala/Java jars:
   - com.thesamet.scalapb.scalapb-runtime_2.13-0.11.20.jar
   - com.typesafe.config-1.4.6.jar
   - com.typesafe.scala-logging.scala-logging_2.13-3.9.5.jar
+  - com.zaxxer.HikariCP-5.1.0.jar
   - io.dropwizard.dropwizard-auth-4.0.7.jar
   - io.dropwizard.dropwizard-configuration-4.0.7.jar
   - io.dropwizard.dropwizard-core-4.0.7.jar

file-service/LICENSE-binary

@@ -268,6 +268,7 @@ Scala/Java jars:
   - com.thesamet.scalapb.scalapb-runtime_2.13-0.11.20.jar
   - com.typesafe.config-1.4.6.jar
   - com.typesafe.scala-logging.scala-logging_2.13-3.9.5.jar
+  - com.zaxxer.HikariCP-5.1.0.jar
   - commons-beanutils.commons-beanutils-1.9.4.jar
   - commons-cli.commons-cli-1.2.jar
   - commons-codec.commons-codec-1.17.1.jar

workflow-compiling-service/LICENSE-binary

@@ -269,6 +269,7 @@ Scala/Java jars:
   - com.thesamet.scalapb.scalapb-runtime_2.13-0.11.20.jar
   - com.typesafe.config-1.4.6.jar
   - com.typesafe.scala-logging.scala-logging_2.13-3.9.5.jar
+  - com.zaxxer.HikariCP-5.1.0.jar
   - com.univocity.univocity-parsers-2.9.1.jar
   - commons-beanutils.commons-beanutils-1.9.4.jar
   - commons-cli.commons-cli-1.2.jar