[GitHub] trafodion pull request #1494: [TRAFODION-3005] Fix issues with keys on long ...

[DaveBirdsall <gi...@git.apache.org>]

GitHub user DaveBirdsall opened a pull request:

    https://github.com/apache/trafodion/pull/1494

    [TRAFODION-3005] Fix issues with keys on long columns

    This is a follow-on to JIRA TRAFODION-2977 (pull request https://github.com/apache/trafodion/pull/1473).
    
    I made two changes here.
    
    1. In the previous pull request, I added a check to the CREATE INDEX logic to make sure the key length is not too long. I put that check too early in the logic. I have now moved that check to the proper place.
    
    2. It turns out that HBase uses rowIDs + possibly the HBase object name + some other info to make entries into another HBase structure internally, and imposes a 32767 key length limit on that. Unfortunately when we exceed the length limit on that internal structure, the HBase application (Trafodion in our case) experiences a hang. To avoid these hangs, we will further restrict maximum key length in Trafodion to 32000. The code change contains a detailed explanation of how this number was arrived at.

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

    $ git pull https://github.com/DaveBirdsall/trafodion Trafodion3005

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

    https://github.com/apache/trafodion/pull/1494.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 #1494
    
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commit 9c935c529c112afe889a05c5f9aa3498a16a2fac
Author: Dave Birdsall <db...@...>
Date:   2018-03-22T18:58:38Z

    [TRAFODION-3005] Fix issues with keys on long columns

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[GitHub] trafodion pull request #1494: [TRAFODION-3005] Fix issues with keys on long ...

[asfgit <gi...@git.apache.org>]

Github user asfgit closed the pull request at:

    https://github.com/apache/trafodion/pull/1494


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