java.sql.SQLException:正在为SQOOP导入抛出期望

Question

当我试图存储表存储在mysql数据库到我的HDFS使用

sqoop import——connect jdbc:mysql://hostname1.com/mydb——username user1——password pwd1——table emp1;

我得到以下异常:

Warning: /opt/cloudera/parcels/CDH-5.4.3-1.cdh5.4.3.p0.6/bin/../lib/sqoop/../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
15/07/24 22:48:54 INFO sqoop.Sqoop: Running Sqoop version: 1.4.5-cdh5.4.3
15/07/24 22:48:54 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
15/07/24 22:48:55 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
15/07/24 22:48:55 INFO tool.CodeGenTool: Beginning code generation
15/07/24 22:48:55 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `emp1` AS t LIMIT 1
15/07/24 22:48:55 ERROR manager.SqlManager: Error reading from database: java.sql.SQLException: Streaming result set com.mysql.jdbc.RowDataDynamic@2d749418 is still active. No statements may be issued when any streaming result sets are open and in use on a given connection. Ensure that you have called .close() on any active streaming result sets before attempting more queries.
java.sql.SQLException: Streaming result set com.mysql.jdbc.RowDataDynamic@2d749418 is still active. No statements may be issued when any streaming result sets are open and in use on a given connection. Ensure that you have called .close() on any active streaming result sets before attempting more queries.
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:934)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:931)
        at com.mysql.jdbc.MysqlIO.checkForOutstandingStreamingData(MysqlIO.java:2735)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1899)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2151)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2619)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2569)
        at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1524)
        at com.mysql.jdbc.ConnectionImpl.getMaxBytesPerChar(ConnectionImpl.java:3003)
        at com.mysql.jdbc.Field.getMaxBytesPerCharacter(Field.java:602)
        at com.mysql.jdbc.ResultSetMetaData.getPrecision(ResultSetMetaData.java:445)
        at org.apache.sqoop.manager.SqlManager.getColumnInfoForRawQuery(SqlManager.java:286)
        at org.apache.sqoop.manager.SqlManager.getColumnTypesForRawQuery(SqlManager.java:241)
        at org.apache.sqoop.manager.SqlManager.getColumnTypes(SqlManager.java:227)
        at org.apache.sqoop.manager.ConnManager.getColumnTypes(ConnManager.java:295)
        at org.apache.sqoop.orm.ClassWriter.getColumnTypes(ClassWriter.java:1833)
        at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1645)
        at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:96)
        at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:478)
        at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:605)
        at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
        at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
        at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
        at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
15/07/24 22:48:55 ERROR tool.ImportTool: Encountered IOException running import job: java.io.IOException: No columns to generate for ClassWriter
        at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1651)
        at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:96)
        at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:478)
        at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:605)
        at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
        at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
        at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
        at org.apache.sqoop.Sqoop.main(Sqoop.java:236)

我的sqoop版本是Running sqoop version: 1.4.5-cdh5.4.3 and mysql-connector version: 5.1.31

修复我的异常有什么帮助吗?

Answer 1

在这个版本的Sqoop中，在/src/java/org/apache/sqoop/manager/MySQLManager.java的MySQLManager类中设置为Integer.MIN_VALUE(-2147483648)的fetch大小存在一些问题。默认值设置为0，在该类中被覆盖。由于这个原因，与该行关联的结果集没有释放锁，因此没有释放错误消息。下面的代码来自Sqoop源代码:

@Override
  protected void initOptionDefaults() {
    if (options.getFetchSize() == null) {
      LOG.info("Preparing to use a MySQL streaming resultset.");
      options.setFetchSize(Integer.MIN_VALUE);      //this line is causing the error
    } else if (
        !options.getFetchSize().equals(Integer.MIN_VALUE)
        && !options.getFetchSize().equals(0)) {
      LOG.info("Argument '--fetch-size " + options.getFetchSize()
          + "' will probably get ignored by MySQL JDBC driver.");
      // see also
      // http://dev.mysql.com/doc/refman/5.5/en
      //                       /connector-j-reference-implementation-notes.html
    }
  }

要解决此错误，请从您的Sqoop版本的源代码的MySQLManager类中删除上述initOptionDefaults方法。

裁判: https://issues.apache.org/jira/browse/sqoop - 1400

Answer 2

如果您正在使用Sqoop Client Java API，您可以在Sqoop options中显式指定读取大小:

private static SqoopOptions SqoopOptions = new SqoopOptions();
 SqoopOptions.setFetchSize(1000);