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GrazittiAPI · ‎09-02-2016

I have an AVRO schema which works and querries fine on HIVE, but when we query the same on Impala it thorws an error saying

"Your query has the following error(s):

Could not connect to <HOST NAME>:21050"

Which is weird and i dont see any log information on Hue as i am able to browse other tables that are defined on TEXT format within same database.

we are on impala-2.1.3+cdh5.3.3+0

One thing which looks wired on my schema when i decsribe it on Impala is it has the first row as NULL like below and i am not sure why!

My AVRO schema file is defined like below:

Its just sample and all the fields are defined as STRING

{ "namespace": "HDFS", "name": "sample", "type": "record", "fields":[{"name":"recipient_identification_number", "type":"string"}, {"name":"validation_digit", "type":"string"}, {"name":"eligibility_status_code", "type":"string"}, {"name":"recipient_last_name", "type":"string"}, {"name":"recipient_first_name", "type":"string"}, {"name":"recipient_middle_name", "type":"string"}, {"name":"recipient_name_appel", "type":"string"}, {"name":"recipient_dob", "type":"string"}, {"name":"recipient_ssn", "type":"string"}, {"name":"recipient_ssn_prefix", "type":"string"}, {"name":"recipient_race_code", "type":"string"},




PS: Not sure why my pics have these wired color.

alex.behm · ‎09-12-2016

Thanks for following up!

I'm pretty sure your table shoud work on more recent versions of Impala since we've fixed several Avro issues related to how schemas are defined.

As a workaround, you could try the following things:

1. In your .avsc file make all fields nullable by specifying the types a a union of null and the type like this:

type:["null", "int"]

2. Also specify corresponding matching column definitions in your CREATE TABLE, i.e.

CREATE TABLE MI_FULL (col1 INT, col2 STRING, )

ROW FORMAT SERDE

(the rest is exactly the same as before)

Let me know if you have questions and whether those workarounds helped!

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alex.behm · ‎10-07-2016

I agree completely. The workaround is not great. Dealing with Avro schemas in a more sensible fashion is definitely on our radar, but I cannot promise an ETA yet.

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Impala AVRO schema throws error while Querying