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https://issues.apache.org/jira/browse/HIVE-322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Min Zhou updated HIVE-322:
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Attachment: registerjars2.patch
The create function statement loads a function class staticly from
$HIVE_AUX_JARS_PATH and hive.aux.jars.path
http://issues.apache.org/jira/browse/HADOOP-4070
We ofen start a Hive thrift server, and it will up for quite a time. We cannot
dynamically load another UDF in another jar unless we restart the server .
It's not practical for us.
This patch introduces a register statement for appending a jar path to hive
on-the-fly. It works well both in CLI and Thrift server mode.
usage:
hive>register '/home/zhoumin/zhoumin.jar';
hive>CREATE TEMPORARY FUNCTION strlen AS
'taobao.hadoop.hive.udf.UdfStringLength';
hive>select strlen(time) from log_data;
Nevertheless, this patch cannot pass current unit test of hive, because the
MapTask run during unit test will serialize MapRedWork w/o having done a
register command. It will cause the ClassLoader cannot find my UDF. see line
61 and line 63 in MapTask.java.
> cannot create temporary udf dynamically, with a ClassNotFoundException
> -----------------------------------------------------------------------
>
> Key: HIVE-322
> URL: https://issues.apache.org/jira/browse/HIVE-322
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.3.0
> Reporter: Min Zhou
> Priority: Blocker
> Attachments: registerjars1.patch, registerjars2.patch
>
>
> I found the ClassLoader cannot load my UDF when doing FunctionTask, because
> the ClassLoader hasnot append its classpaths on-the-fly yet.
> The ExecDriver' s addToClassPath(String[] newPaths) method is the only entry
> for ClassLoader dynamically append its classhpaths (besides hadoop's
> GenericOptionsParser).
> But that function wasnot called before FunctionTask getting my UDF class by
> class name. I think this is the reason why I came across that failure.
> scenario description:
> I set a peroperty in hive-site.xml to configure the classpath of my udf.
> <property>
> <name>hive.aux.jars.path</name>
> <value>/home/hadoop/hdpsoft/hive-auxs/zhoumin.jar</value>
> </property>
> but failed to register it with a ClassNotFoundException when creating udf
> through the sql command.
> CREATE TEMPORARY FUNCTION strlen AS 'hadoop.hive.udf.UdfStringLength'
> I'll make a patch soon.
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