Any work round to avoid duplicate records in impala for Primary key column

[#1]

Appreciate if any work round to avoid duplicate records in impala for Primary key column.

[#2]

Are you asking pertain to inseration or reterival of data ?

[#3]

thinking of avoidng duplicates while insertion if this won't cause performacne issue.

[#4]

@Msdhan

https://www.cloudera.com/documentation/enterprise/5-3-x/topics/impala_porting.html

According to the above link, Take out any CREATE INDEX, DROP INDEX, and ALTER INDEX statements, and equivalent ALTER TABLEstatements. Remove any INDEX, KEY, or PRIMARY KEY clauses from CREATE TABLE and ALTER TABLE statements. Impala is optimized for bulk read operations for data warehouse-style queries, and therefore does not support indexes for its tables.

Yes in general, you cannot achieve both Performance and Indexing. So if possible, you can try to control duplicate in the source (select) portion instead of target (insert) portion

Ex:

insert into table trg_table 

select * from src_table

[#5]

Thanks Saranvisa for this explanation

[#6 · Accepted solution]

Impala does not have a concept of PK .However You have two options 

down the road if you want to implement delete single row you cant perform them on Hive / Impala . So you can implement using Impala-kudu format . Kudu format you can create table with primary key , plus you perform single row delete. 

or the hard way to achive this is to 

STEP 1

CREATE TABLE Sample
(
    name STRING,
    street  STRING,
    RD123      Timestamp ,(Assume this is unique since we dont have Pk)
    
)

STEP 2
 
Perform the LOAD DATA INTO Sample

STEP 3 - Create another table 

Create table sample_no_dupli AS select SELECT col1,col2,MAX(RD123) AS createdate FROM JLT_STAHING
GROUP BY name,street

[#7]

csguna, appreciate your inputs. will try this.

[#8]

@Msdhan You Welcome :))