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

Question

When I run SparkSQL :

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

I get this error:

        
Caused by: java.sql.SQLException: Another instance of Derby may have already booted the database /root/spark/bin/metastore_db.
        at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
        ... 122 more
Caused by: ERROR XSDB6: Another instance of Derby may have already booted the database /root/spark/bin/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)

Please help

Answer 1

As mentioned in the error, there's another instance of Derby running.

To solve this, find the running instance and kill it.

ps -ef | grep spark-shell
kill -9 processID

Replace processID with the ID of the spark shell process. This should solve the problem.