Driver源码分析

Dirver类

在源代码中对于Driver的描述如下：

/**
 * Sqoop driver that manages the job lifecyle
 *
 * All Sqoop internals are handled in this class:
 * * Submission engine
 * * Execution engine
 * * Driver config
 *
 * Current implementation of entire submission engine is using repository
 * for keeping track of running submissions. Thus, server might be restarted at
 * any time without any affect on running jobs. This approach however might not
 * be the fastest way and we might want to introduce internal structures for
 * running jobs in case that this approach will be too slow.
 */

所以Driver对应于Job,负配置和任务的提交和执行。

初始化

其初始化的源代码如下所示：

public synchronized void initialize(boolean autoUpgrade) {
    LOG.trace("Begin Driver initialization");

    // Register driver in repository
    mDriver = RepositoryManager.getInstance().getRepository().registerDriver(mDriver, autoUpgrade);

    SqoopConfiguration.getInstance().getProvider().registerListener(new CoreConfigurationListener(this));

    LOG.info("Driver initialized: OK");
  }