Min Chen created CLOUDSTACK-409:
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Summary: 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
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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