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https://issues.apache.org/jira/browse/HIVE-1157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832554#action_12832554
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Edward Capriolo commented on HIVE-1157:
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Sorry about that. I am not sure if I had an incomplete thought, or I cut half
my message.
In any case, I like your idea of bringing jars into HDFS. The fact that the jar
file has to live on the local filesystem where the job is launched from is very
constraining. You can not leverage your Distributed File System. The same can
be said for SerDe's. Maybe these files should live on HDFS in the warehouse
directory somehow.
+1 on your thinking
> UDFs can't be loaded via "add jar" when jar is on HDFS
> ------------------------------------------------------
>
> Key: HIVE-1157
> URL: https://issues.apache.org/jira/browse/HIVE-1157
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Philip Zeyliger
> Priority: Minor
>
> As discussed on the mailing list, it would be nice if you could use UDFs that
> are on jars on HDFS. The proposed implementation would be for "add jar" to
> recognize that the target file is on HDFS, copy it locally, and load it into
> the classpath.
> {quote}
> Hi folks,
> I have a quick question about UDF support in Hive. I'm on the 0.5 branch.
> Can you use a UDF where the jar which contains the function is on HDFS, and
> not on the local filesystem. Specifically, the following does not seem to
> work:
> # This is Hive 0.5, from svn
> $bin/hive
> Hive history file=/tmp/philip/hive_job_log_philip_201002081541_370227273.txt
> hive> add jar hdfs://localhost/FooTest.jar;
>
> Added hdfs://localhost/FooTest.jar to class path
> hive> create temporary function cube as 'com.cloudera.FooTestUDF';
>
> FAILED: Execution Error, return code 1 from
> org.apache.hadoop.hive.ql.exec.FunctionTask
> Does this work for other people? I could probably fix it by changing "add
> jar" to download remote jars locally, when necessary (to load them into the
> classpath), or update URLClassLoader (or whatever is underneath there) to
> read directly from HDFS, which seems a bit more fragile. But I wanted to
> make sure that my interpretation of what's going on is right before I have at
> it.
> Thanks,
> -- Philip
> {quote}
> {quote}
> Yes that's correct. I prefer to download the jars in "add jar".
> Zheng
> {quote}
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