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From "Ashutosh Mestry (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ATLAS-2092) Failures following concurrent updates
Date Thu, 31 Aug 2017 16:26:00 GMT

    [ https://issues.apache.org/jira/browse/ATLAS-2092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16149210#comment-16149210
] 

Ashutosh Mestry commented on ATLAS-2092:
----------------------------------------

[~grahamwallis] I am reading the PDF now. Analysis is comprehensive and I find it interesting
read. Thanks for putting this together!

One thing we have noticed is that version of _Berkeley DB_ we are using has a few problems.
 Mostly around transactions commits. Only yesterday we were contemplating on effort required
to move our tests to use embedded HBASE and embedded Solr. We have not reached any conclusion
yet. Doing this would help us get around some of the intermittent failures we see in test
environments. It will also make our unit & IT tests run in an environment that is close
to production.

How easy is it for you to duplicate this problem on HBASE/Solr setup? It would be interesting
to see the results.

> Failures following concurrent updates
> -------------------------------------
>
>                 Key: ATLAS-2092
>                 URL: https://issues.apache.org/jira/browse/ATLAS-2092
>             Project: Atlas
>          Issue Type: Bug
>          Components:  atlas-core
>            Reporter: Graham Wallis
>         Attachments: Investigations and findings relating to concurrent updates in Atlas.pdf
>
>
> There is a race condition that causes duplication of schema vertices as a result of concurrent
graph updates. This in turn leads to failure of queries that specify a type such as an edge
label used in an attribute that references another entity. This problem is known to affect
Atlas entity refs – which create graph edges that use edge label schema vertices. It is
likely that it also affects other types in Atlas.



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