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Hive >> mail # user >> handling null argument in custom udf


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Søren 2012-12-04, 13:31
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Edward Capriolo 2012-12-04, 14:43
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Søren 2012-12-04, 14:58
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Mark Grover 2012-12-05, 03:31
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RE: handling null argument in custom udf
Could you please look into and share your task log/attemptlog for complete error trace or actual error behind this?

-Vivek
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From: Søren [[EMAIL PROTECTED]]
Sent: 04 December 2012 20:28
To: [EMAIL PROTECTED]
Subject: Re: handling null argument in custom udf

Thanks. Did you mean I should handle null in my udf or my serde?

I did try to check for null inside the code in my udf, but it fails even before it gets called.

This is from when the udf fails:
....
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to execute method public org.apache.hadoop.io.Text com.company.hive.myfun.evaluate(java.lang.Object,java.lang.Object)
on objectcom.company.hive.myfun@1412332 of class com.company.hive.myfun with arguments {0:java.lang.Object, null} of size 2

It looks like there is a null, or is this error message misleading?
On 04/12/2012 15:43, Edward Capriolo wrote:
There is no null argument. You should handle the null case in your code.

If (arga == null)

Or optionally you could use a generic udf but a regular one should handle what you are doing.

On Tuesday, December 4, 2012, Søren <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
> Hi Hive community
>
> I have a custom udf, say myfun, written in Java which I utilize like this
>
> select myfun(col_a, col_b) from mytable where ....etc
>
> col_b is a string type and sometimes it is null.
>
> When that happens, my query crashes with
> ---------------
> java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row
> {"col_a":"val","col_b":null}
> ...
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to execute method public org.apache.hadoop.io.Text
> ---------------
>
> public final class myfun extends UDF {
>         public Text evaluate(final Text argA, final Text argB) {
>
> I'm unsure how this should be fixed in a proper way. Is the framework looking for an overload of evaluate that would comply with the null argument?
>
> I need to say that the table is declared using my own json serde reading from S3. I'm not processing nulls in my serde in any special way because Hive seems to handle null in the right way when not passed to my own UDF.
>
> Are there anyone out there with ideas or experiences on this issue?
>
> thanks in advance
> Søren
>
>
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Vivek Mishra 2012-12-05, 10:10
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Søren 2012-12-06, 10:43
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB