scala - 未能获得数据库默认返回 NoSuchObjectException

Question

当我启动 spark 时，我收到以下警告:

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)
我再次收到此警告:

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，您是否知道为什么会发生此警告，以及尽管警告正在发生，但命令 var sqlContext = new org.apache.spark.sql.hive.HiveContext(sc)它工作正常吗？

Answer 1

BoneCP 是一个 Java JDBC 连接池，它尝试绑定(bind)到 JDBC 连接，这就是您收到这些警告的原因。您可以通过配置记录器级别来抑制此类警告。