Question

我有一个hive + hbase集成群集。

当我尝试通过hive的java客户端执行查询时，有时会发生ClassNotFoundException。

我的java代码：

final Connection conn = DriverManager.getConnection(URL);
final ResultSet rs = conn.executeQuery("SELECT count(*) FROM test_table WHERE (source = '0' AND ur_createtime BETWEEN '20121031000000' AND '20121031235959')");

我可以在hive cli mod中执行sql：SELECT count(*) FROM test_table WHERE (source = '0' AND ur_createtime BETWEEN '20121031000000' AND '20121031235959')，并获取查询结果，因此我的sql中没有错误。

客户端异常：

Caused by: java.sql.SQLException: Query returned non-zero code: 9, cause: FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.MapRedTask
    at org.apache.hadoop.hive.jdbc.HiveStatement.executeQuery(HiveStatement.java:189)
... 23 more

服务器端异常（hadoop-jobtracker）：

2012-11-05 18:55:39,443 INFO org.apache.hadoop.mapred.TaskInProgress: Error from attempt_201210301133_0112_m_000000_3: java.io.IOException: Cannot create an instance of InputSplit class = org.apache.hadoop.hive.hbase.HBaseSplit:org.apache.hadoop.hive.hbase.HBaseSplit
    at org.apache.hadoop.hive.ql.io.HiveInputFormat$HiveInputSplit.readFields(HiveInputFormat.java:146)
    at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:67)
    at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:40)
    at org.apache.hadoop.mapred.MapTask.getSplitDetails(MapTask.java:396)
    at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:412)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)
    at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Unknown Source)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
    at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hive.hbase.HBaseSplit
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:819)
    at org.apache.hadoop.hive.ql.io.HiveInputFormat$HiveInputSplit.readFields(HiveInputFormat.java:143)
    ... 10 more

我的hive-env.sh

export HIVE_AUX_JARS_PATH=/data/install/hive-0.9.0/lib/hive-hbase-handler-0.9.0.jar,/data/install/hive-0.9.0/lib/hbase-0.92.0.jar,/data/install/hive-0.9.0/lib/zookeeper-3.4.2.jar

我的hive-site.xml

<property>
    <name>hive.zookeeper.quorum</name>
    <value>hadoop01,hadoop02,hadoop03</value>
    <description>The list of zookeeper servers to talk to. This is only needed for read/write locks.</description>
</property>

我开始如下服务：

hive --service hiveserver -p 10000 &

服务器端错误日志表明找不到HBaseSplit。但为什么？我该如何解决这个问题？

Answer 1

如果您无权访问配置文件，可以使用--auxpath开关将jar添加到hive cli类路径：

hive --auxpath /path/to/hive-hbase-handler-0.10.0-cdh4.2.0.jar,/path/to/hbase.jar

Answer 2

在$ HIVE_HOME中创建一个文件夹auxlib，并将所有hive-hbase-handler，hbase jar放到该文件夹

将以下行添加到$ HIVE_HOME / conf / hive-site.xml

<property>
 <name>hive.aux.jars.path</name>
 <value>file:///<absolute-path-of-all-auxlib-jars></value>
</property>

重启hive服务器

Answer 3

此问题的解决方法是您可以复制jar文件 hive-hbase-handler-0.9.0-cdh4.1.2，hbase-0.92.1-cdh4.1.2-security等到HADOOP lib文件夹或者在HADOOP_CLASSPATH环境变量中添加这些jar的路径。

使用hive + hbase集成的java客户端时ClassNotFoundException

3 个答案: