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From ManoharVanam <...@git.apache.org>
Subject [GitHub] carbondata pull request #1693: [CARBONDATA-1909] Load is failing during inse...
Date Wed, 20 Dec 2017 10:03:22 GMT
GitHub user ManoharVanam opened a pull request:

    https://github.com/apache/carbondata/pull/1693

    [CARBONDATA-1909] Load is failing during insert into operation when load is concurrently
done to source table

    Load is failing during insert into operation when load is concurrently done to source
table
    
    Scenario:
    Client1:
    1. Create source table
    2. load big data
    
    Client2:
    1. create table t1
    2. insert into t1 select * from  source table   - load fails
    
    Data Load:
    Step1 : Dictionary Generarion
    Step2: Loading data
    
    Assume 100 records is read from source table using select statement, but when execution
reaches step2, 50 more records has been added to source table. So when select happens on source
table during data loading , it gets new record for which dictionary is not generated. So there
is inconsistency.
    
    Solution : 
    To solve this issue we persisted dataframe, so that select will not get fired for second
time. But this has some performance impact. So we are providing configuration to enable persist,
if user wants to perform this kind of scenario he can enable this configuration at cost of
performance.
    
    Be sure to do all of the following checklist to help us incorporate 
    your contribution quickly and easily:
    
     - [ ] Any interfaces changed?
     
     - [ ] Any backward compatibility impacted?
     
     - [ ] Document update required?
    
     - [ ] Testing done
            Please provide details on 
            - Whether new unit test cases have been added or why no new tests are required?
            - How it is tested? Please attach test report.
            - Is it a performance related change? Please attach the performance test report.
            - Any additional information to help reviewers in testing this change.
           
     - [ ] For large changes, please consider breaking it into sub-tasks under an umbrella
JIRA. 
    


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/ManoharVanam/incubator-carbondata pr1

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/carbondata/pull/1693.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1693
    
----
commit d9c2f21a4db8115cf97cb6c073e44d43bc90d9b8
Author: Manohar <manohar.crazy09@...>
Date:   2017-12-20T09:39:45Z

    Load is failing during insert into operation when load is concurrently done to source
table

----


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