如何从spark-shell开始停止spark

Question

我只是在用spark-shell玩玩spark。我已经在我的EC2实例中使用hive构建了spark。由于网络问题，我与EC2实例断开连接。

现在，当我重新连接并启动spark-shell时，当我尝试创建hiveContext时，我得到了以下错误

Caused by: ERROR XSDB6: Another instance of Derby may have already booted the database /home/ubuntu/work/software/spark/spark-1.2.2/metastore_db.
    at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
    at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.privGetJBMSLockOnDB(Unknown Source)
    at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.getJBMSLockOnDB(Unknown Source)
    at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.boot(Unknown Source)

这是因为以前的spark-shell仍然在运行，并获得了derby DB。

有没有办法找到pid杀了它？

从here我发现./bin/spark-class org.apache.spark.deploy.Client kill <driverId>会杀掉火花。但是怎样才能找到driverId呢？

Answer 1