当我启动spark时，我得到以下警告：

Using Scala version 2.10.5 (OpenJDK 64-Bit Server VM, Java 1.8.0_77)
Type in expressions to have them evaluated.
Type :help for more information.
Spark context available as sc.
16/04/03 15:07:31 WARN Connection: BoneCP specified but not present in CLASSPATH (or one of dependencies)
16/04/03 15:07:31 WARN Connection: BoneCP specified but not present in CLASSPATH (or one of dependencies)
16/04/03 15:07:39 WARN ObjectStore: Version information not found in metastore. hive.metastore.schema.verification is not enabled so recording the schema version 1.2.0
16/04/03 15:07:39 WARN ObjectStore: Failed to get database default, returning NoSuchObjectException
SQL context available as sqlContext.

scala>

当我执行这个命令时： var sqlContext = new org.apache.spark.sql.hive.HiveContext(sc) 我再次得到这个警告：

scala> var sqlContext = new org.apache.spark.sql.hive.HiveContext(sc)
16/04/03 15:04:31 WARN Connection: BoneCP specified but not present in CLASSPATH (or one of dependencies)
16/04/03 15:04:31 WARN Connection: BoneCP specified but not present in CLASSPATH (or one of dependencies)
16/04/03 15:04:35 WARN ObjectStore: Failed to get database default, returning NoSuchObjectException
sqlContext: org.apache.spark.sql.hive.HiveContext = org.apache.spark.sql.hive.HiveContext@13453610

所以我的问题是，如果你知道为什么这个警告会发生，如果，尽管警告发生了，命令 var sqlContext = new org.apache.spark.sql.hive.HiveContext(sc) 它工作正常吗？