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MaridDB Galera Cluster を MySQL Connector/J + Scala でロードバランスしながらアクセス

 MariaDB Galera Cluster ですが、マルチマスターのクラスター構成になるので、接続するサーバ自体をクライアント側の判断により なんらかの手段で選択する必要があります。(逆に言えば、同じマシンスペックならどのマスターにつないでも同じということですが)
 色々なロードバランサーやプロキシを使ったり、クライアントでがりがりと機能を実装したり色々手段は考えられますが、 今回は、お手軽に MySQL Connector/J を使ってみました。
 URLの記述を変えるだけで、別途いろいろやる手間がなくてお手軽に構築できるからです。
 そうなると、自ずと JVM で動く環境ということで、お勉強もかねて Scala で実際のベンチマークは書いてます。
 世の中、当然 Java や Scala から MySQL にアクセスするためのものが色々ありますが、特殊なテストしたりするときに便利なので、 自前で直接 JDBC を叩くクラスも自前で書いてみました。

 以下のリンクは、Scala クラスの全裸ソースは以下のアーカイブ(zip)です。
 JUnit4 + ScalaTest の単体テストコード付きですので、使い方はそっちを読んでください。
 当然、別途 MySQL Connector/J の jar ファイルは必要になりますので、MySQL のサイトからダウンロードしておいてコンパイラのライブラリで指定しましょう。

ソースへのリンク : myoriginal.zip


接続

基本的には、URL の "jdbc:mysql:" の部分を、"jdbc:mysql:loadbalance:" に変えて、サーバを羅列すれば マルチマスタロードバランスの接続が一応実現できます。(デフォルトなので、ランダム切り替えになるはず)
URL生成部分の関数は具体的にはこんな感じ。(明示的にランダム切り替えを指定)
  /**
   *  URL 生成
   *  @param hosts     DBホストのリスト
   *  @param dataBase  データベース名
   *  @param port      ポート番号
   *  @param isLBEnabled Connector/J ロードバランサ有効
   *  @return          接続 URL
   */
  def makeUrl(hosts: Seq[String], dataBase: String, port: Int, isLBEnabled: Boolean = true) = {
    val h = hosts.foldLeft("")((r, x) => if (r == "") r + x else r + "," + x)
    (if (isLBEnabled) "jdbc:mysql:loadbalance://" else "jdbc:mysql://") + h + ":" + port + "/" + dataBase + "?zeroDateTimeBehavior=convertToNull&connectTimeout=" + connectTimeout + "&socketTimeout=" + socketTimeout
  }

※今回は、別所で "loadBalanceStrategy" をパスワードなどと一緒にパラメータで指定しています。こ れは、"bestResponseTime" も指定できますが、クラスタの一部サーバが落ちてるときは、接続に多少余分に時間かかかる現象が出たので、 "random" にしました。こちらのケアレスミスの可能性もありますが最適を選ぶロジックに若干癖があるのかもしれません。
本来は NDB 向けなどで、マルチマスター構成向けではないでしょうしね。


SQL 実行部分

 デッドロックを検出したら、再帰コールを利用してリトライを試みるようにしています。
 実処理部分を高階関数で実装できたり、try~catch~finally 式で、値が finally の部分が返るわけではないのはとても便利ですね。
 disposeStmt は準備したステートメントを常に開放する内部のメソッドです。関数型プログラミングとしては副作用ばりばりにありですが。

  /** デッドロック検出時の最大リトライ回数(極端に大きいのは禁止) */
  val DEADLOCK_RETRY = 50
  /** デッドロック検出時のリトライ待ち時間(msec) */
  val DEADLOCK_RETRY_SLEEP = 200

....... 省略 ........

  /**
   *  ステートメント後始末付き汎用 SQL 実行 (とは言っても実行自体は外部関数)
   */
  def _executeCommon[A](exception: Boolean)(sql: String)(f: (String) => A): Option[A] = {
    try {
      _executeWithDeadlockRetry(sql)(f)(DEADLOCK_RETRY)
    } catch {
      case e: Exception => if (exception) throw e else None
    } finally {
      disposeStmt
    }
  }

  /**
   * リトライ機能付き SQL 実行
   */
  protected def _executeWithDeadlockRetry[A](sql: String)(f: (String) => A)(retryCnt: Int): Option[A] = {
    try {
      Some(f(sql))
    } catch {
      case e: java.sql.SQLException if e.getErrorCode() == 1213 && retryCnt > 0 => mySleep(DEADLOCK_RETRY_SLEEP); _executeWithDeadlockRetry(sql)(f)(retryCnt - 1)
      case e: Exception => throw e
    } finally {
    }
  }


結果セットの処理

 SELECT などで取得した結果は、Java の ResultSet のままでは Scala 的には相当に微妙なので Scala コレクションに変換します。
 データ構造を柔軟かつお手軽に扱えるように、データは Seq[Map[K,V]] で扱ってます。要するにハッシュ(カラム)のリスト(行)です。
 Scala は、Perl や PHP などのスクリプト言語のハッシュ配列と同様に簡潔な記述で Map が扱えるのは至極便利ですよね。
 変換処理は、再帰などを使って不変コレクションでも実現できますが、あんまりメリットないだろうということで可変コレクションで データを変換して纏めたのちに不変コレクションに変換してます。とりあえず極端なメモリ、パフォーマンス重視でもないので。
 以下は取得結果全一括変換の場合なので全変換関数呼び出してますが、莫大な結果を1行ずつ処理したいときも、そういう関数を 作って渡す関数を変えるだけで実現できるのは関数型言語の便利なところ。
 他の言語でもコールバック処理はできますが、結構記述が面倒ですしね.....。

  /**
   * 1行結果変換
   * @param a   結果セット
   * @return    1行
   */
  def oneRowToMap(a: java.sql.ResultSet): Row = {
    val meta = a.getMetaData
    val coln = meta.getColumnCount() // 列項目数
    val m = collection.mutable.HashMap[String, Any]()
    for (i <- 1 to coln) m += meta.getColumnName(i) -> a.getObject(i)
    m.toMap
  }

  /**
   * ResultSet(Java) を RowSet(scala コレクション) に変換する
   * @param a   結果セット
   * @return    取得行セット
   */
  def resultSetAllToRowSet(a: java.sql.ResultSet): RowSet = {
    val r = MutableList[Row]()
    while (a.next) r += oneRowToMap(a)
    r.toList // パフォーマンス的には無駄だけど、安全のために List に変換
  }

  /**
   * 汎用 SELECT
   */
  def _select[A](sql: String, converter: java.sql.ResultSet => A, params: Seq[Any] = Seq()): Option[A] = {
    def qfunc(sql: String) = {
      val r = if (params.isEmpty) _query(sql) else _query(sql, params)
      val m = converter(r)
      r.close
      m
    }
    _executeCommon(errorException)(sql)(qfunc)
  }

  /**
   * SELECT 結果全取得
   * @param sql     SQL文字列。プレースホルダ使用可能
   * @param params  プレースホルダに渡すパラメータ。nullでパラメータなし
   * @return        検索結果(全行)
   */
  def selectAll(sql: String, params: Seq[Any] = Seq()): Option[RowSet] = _select(sql, resultSetAllToRowSet, params)

|

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