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https://issues.apache.org/jira/browse/AMBARI-9736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Hurley updated AMBARI-9736:
------------------------------------
Attachment: AMBARI-9736.patch
> Ambari Exhausts Connection Pool When Using MySQL Due To Invalid Connections
> ---------------------------------------------------------------------------
>
> Key: AMBARI-9736
> URL: https://issues.apache.org/jira/browse/AMBARI-9736
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 1.7.0, 2.0.0
> Reporter: Jonathan Hurley
> Assignee: Jonathan Hurley
> Priority: Critical
> Fix For: 1.7.0, 2.0.0
>
> Attachments: AMBARI-9736.patch
>
>
> When using MySQL, Ambari appears to try to use invalid connections about
> about 8 hours of use.
> {noformat}
> Exception EclipseLink-4002 (Eclipse Persistence Services -
> 2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.DatabaseException
> Internal Exception: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:
> Communications link failure
> The last packet successfully received from the server was 909,270
> milliseconds ago. The last packet sent successfully to the server was 0
> milliseconds ago.
> Error Code: 0
> Call: SELECT t0.service_config_id, t0.cluster_id, t0.create_timestamp,
> t0.group_id, t0.note, t0.service_name, t0.user_name, t0.version FROM
> serviceconfig t0 WHERE ((t0.cluster_id = ?) AND (t0.create_timestamp =
> (SELECT MAX(t1.create_timestamp) FROM serviceconfig t1 WHERE
> (((t1.service_name = t0.service_name) AND (t1.cluster_id = ?)) AND
> (t1.group_id IS NULL)))))
> bind => 2 parameters bound
> Query: ReadAllQuery(referenceClass=ServiceConfigEntity sql="SELECT
> t0.service_config_id, t0.cluster_id, t0.create_timestamp, t0.group_id,
> t0.note, t0.service_name, t0.user_name, t0.version FROM serviceconfig t0
> WHERE ((t0.cluster_id = ?) AND (t0.create_timestamp = (SELECT
> MAX(t1.create_timestamp) FROM serviceconfig t1 WHERE (((t1.service_name =
> t0.service_name) AND (t1.cluster_id = ?)) AND (t1.group_id IS NULL)))))")
> {noformat}
> EclipseLink does not appear to correctly handle connections that have been
> invalidated by MySQL after the default timeout time of 8 hours.
> STR:
> - Set MySQL's timeouts via /etc/my.cnf
> {noformat}
> [mysqld]
> interactive_timeout=120
> wait_timeout=120
> {noformat}
> - Verify the connection timeouts are lowered
> {noformat}
> mysql> SHOW VARIABLES LIKE "%timeout%";
> +----------------------------+----------+
> | Variable_name | Value |
> +----------------------------+----------+
> | connect_timeout | 10 |
> | delayed_insert_timeout | 300 |
> | innodb_lock_wait_timeout | 50 |
> | innodb_rollback_on_timeout | OFF |
> | interactive_timeout | 120 |
> | lock_wait_timeout | 31536000 |
> | net_read_timeout | 30 |
> | net_write_timeout | 60 |
> | slave_net_timeout | 3600 |
> | wait_timeout | 120 |
> +----------------------------+----------+
> 10 rows in set (0.00 sec)
> {noformat}
> - Launch Ambari and wait a few minutes. The exceptions will begin and Ambari
> will stop working properly.
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