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https://issues.apache.org/jira/browse/CONNECTORS-114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13015013#comment-13015013
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Karl Wright commented on CONNECTORS-114:
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This is stalled, because HSQLDB is not yet ready for the kinds of demands that
ManifoldCF will put on it. Working with Derby seems more appropriate since
they've been able to respond to bugs.
> Derby seems too unstable in multithreaded situations to be a good database
> for ManifoldCF, so try to add support for HSQLDB
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: CONNECTORS-114
> URL: https://issues.apache.org/jira/browse/CONNECTORS-114
> Project: ManifoldCF
> Issue Type: Bug
> Components: Framework core
> Reporter: Karl Wright
>
> Derby seems to have multiple problems:
> (1) It has internal deadlocks, which even if caught cause poor performance
> due to stalling (CONNECTORS-111);
> (2) It has no support for certain SQL constructs (CONNECTORS-109 and
> CONNECTORS-110);
> (3) It locks up entirely for some people (CONNECTORS-100).
> HSQLDB has been recommended as another potential embedded database that might
> work better.
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