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https://issues.apache.org/jira/browse/RANGER-3692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17516660#comment-17516660
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Bhavik Patel commented on RANGER-3692:
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[~zilong zhu] Please check https://issues.apache.org/jira/browse/RANGER-2895
> Ranger cannot connect to the DB when the DB is outaged for a long time
> ----------------------------------------------------------------------
>
> Key: RANGER-3692
> URL: https://issues.apache.org/jira/browse/RANGER-3692
> Project: Ranger
> Issue Type: Bug
> Components: admin
> Affects Versions: 2.1.0
> Reporter: Zilong Zhu
> Assignee: Zilong Zhu
> Priority: Major
> Attachments:
> 0001-RANGER-3692-Ranger-cannot-connect-to-the-DB-when-the.patch
>
>
> We had a database problem where the database was offline for more than a
> week. However ranger connot connect to the DB.
> {code:java}
> Internal Exception: java.sql.SQLException: Connections could not be acquired
> from the underlying database!
> [C3P0PooledConnectionPoolManager[identityToken->1hgf80qaljdycrokead8h|73c6299]-HelperThread-#0]
> WARN com.mchange.v2.log.slf4j.Slf4jMLog$Slf4jMLogger$WarnLogger
> (Slf4jMLog.java:223) -
> com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@7179549 --
> Acquisition Attempt Failed!!! Clearing pending acquires. While trying to
> acquire a needed new resource, we failed to succeed more than the maximum
> number of allowed acquisition attempts (30). Last acquisition attempt
> exception:
> com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link
> failure
> [C3P0PooledConnectionPoolManager[identityToken->1hgf80qaljdycrokead8h|73c6299]-HelperThread-#0]
> WARN com.mchange.v2.log.slf4j.Slf4jMLog$Slf4jMLogger$WarnLogger
> (Slf4jMLog.java:220) - Having failed to acquire a resource,
> com.mchange.v2.resourcepool.BasicResourcePool@5efb2b9 is interrupting all
> Threads waiting on a resource to check out. Will try again in response to new
> client requests. {code}
> {code:java}
> Internal Exception: java.sql.SQLException: An SQLException was provoked by
> the following failure: com.mchange.v2.resourcepool.ResourcePoolException: A
> ResourcePool cannot acquire a new resource -- the factory or source appears
> to be down.
> {code}
> I found out that this is a bug in c3p0 0.9.5.3. This bug was resolved in
> 0.9.5.4. So I suggest to upgrade the version of c3p0 to 0.9.5.4.
> [Force kill acquires by rscadrde · Pull Request #91 · swaldman/c3p0 ·
> GitHub|https://github.com/swaldman/c3p0/pull/91]
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