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 <dbirdsall@...>
Date: 2018-03-22T18:58:38Z
[TRAFODION-3005] Fix issues with keys on long columns
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