Caused by: ERROR XSDB6: Another instance of Derby may have already booted the database

Question

I am trying to run SparkSQL :

val sqlContext = new org.apache.spark.sql.hive.HiveContext(sc)  

But the error i m getting is below:

Answer 1

an lck(lock) file is an access control file which locks the database so that only a single user can access or update the database. The error suggests that there is another instance which is using the same database. Thus you need to delete the .lck files. In your home directory, go to metastore_db and delete any .lck files.