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https://issues.apache.org/jira/browse/ARTEMIS-2823?focusedWorklogId=484936&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-484936
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ASF GitHub Bot logged work on ARTEMIS-2823:
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Author: ASF GitHub Bot
Created on: 16/Sep/20 05:31
Start Date: 16/Sep/20 05:31
Worklog Time Spent: 10m
Work Description: uomik commented on pull request #3204:
URL: https://github.com/apache/activemq-artemis/pull/3204#issuecomment-693180413
> I suppose that the data source pool need to be configured somehow or the
lease lock renew will make it stop.
> That's the expected behaviour?
The drawback with shared store, being database or something else, is that it
essentially becomes a single point of failure for the whole cluster. If we lose
the database, we lose the ability to sync data between master and backup, the
ability to ensure data integrity and broker high availability. In this case, on
my opinion, the only thing we can do is to shut down the broker node as
precautionary measure. This is the way it was before I fiddled with anything,
and I saw no reasons to change it.
The way you can mitigate this single point of failure is to have multiple
master-backup pairs distributed accross multiple databases (servers). Or build
some redundancy in the infrastrusture (clustering the database etc.).
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Issue Time Tracking
-------------------
Worklog Id: (was: 484936)
Time Spent: 5h 10m (was: 5h)
> Improve JDBC connection management
> ----------------------------------
>
> Key: ARTEMIS-2823
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2823
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Reporter: Mikko
> Priority: Major
> Time Spent: 5h 10m
> Remaining Estimate: 0h
>
> I have a case where the whole clustering reliability and HA must rely on HA
> capabilities of clustered database, and running on top of application server
> is not an option.
> The current JDBC store implementation is rather bare bones on the connection
> management side. JDBC driver is used directly with no management layer. At
> startup, the broker just opens couple of direct connections to database and
> expects them to be available forever. This is something that cannot be
> expected in HA production environment. So, similarly to the discussion linked
> below, in our case we lose the db connection after one hour, and all the
> brokers need to be restared to get new connections:
> [http://activemq.2283324.n4.nabble.com/Artemis-does-not-reconnect-to-MySQL-after-connection-timeout-td4751956.html]
>
> This is something that could be resolved by simply using JDBC4 isValid
> checks, but proper connection handling and pooling through datasource would
> be preferrable.
> I have implemented a solution for this by using DBCP2 datasource. Our test
> cluster has been successfully running this forked version since the release
> of Artemis 2.13.0. I will prepare of pull request if this is seen to be
> something that can be useful.
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