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https://issues.apache.org/jira/browse/CLOUDSTACK-409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Min Chen resolved CLOUDSTACK-409.
---------------------------------
Resolution: Fixed
Fixed through patch https://reviews.apache.org/r/7726/
> ThreadLocal Transaction and its db connection got reset for user managed db
> connnection, causing ClusterHeartBeat thread frequently trying to get db
> connection.
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CLOUDSTACK-409
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-409
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: Management Server
> Affects Versions: 4.0.0
> Reporter: Min Chen
> Assignee: Min Chen
> Priority: Critical
>
> If we want to reuse db connection, we will invoke
> Transaction.transitToUserManagedConnection to manage our db connection
> ourselves. However, this piece of code below
> public void close() {
> .........
> if(this._dbId == CONNECTED_DB) {
> tls.set(_prev);
> _prev = null;
> s_mbean.removeTransaction(this);
> }
> }
> will reset ThreadLocal transaction and close the connection, making reuse db
> connection impossible. The impact of this bug is that currently
> ClusterHeartBeat thread will keep acquiring db and releasing db connection
> instead of keeping one connection when thread start, thus may cause MS
> automatically shutdown in a heavy load environment where MS cannot get a db
> connection.
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