[jira] [Resolved] (CLOUDSTACK-7832) MySQL deadlock occurred in resetting job_executing_msid of the completed vm worker job causing job queue stuck.

["Min Chen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CLOUDSTACK-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Min Chen resolved CLOUDSTACK-7832.
----------------------------------
    Resolution: Fixed

> MySQL deadlock occurred in resetting job_executing_msid of the completed vm worker job causing job queue stuck.
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-7832
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-7832
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Management Server
>    Affects Versions: 4.3.0
>            Reporter: Min Chen
>            Assignee: Min Chen
>            Priority: Critical
>             Fix For: 4.5.0
>
>
> This is mainly happening for an vm operation involving two VM work jobs consecutively, for example, destroyVM which involved two steps: stopVM and deleteAllVMSnapshots. In updating job_executing_msid column of the first VM worker job, the second VM worker job has been scheduled to run, then we will see such MySQL deadlock exception happening:
> 2014-09-17 03:26:40,538 ERROR [o.a.c.f.j.i.AsyncJobManagerImpl] (Work-Job-Executor-164:job-831168/job-831176) Double excep
> tion
> com.cloud.utils.exception.CloudRuntimeException: DB Exception on: com.mysql.jdbc.PreparedStatement@42c4a7ea: UPDATE async_
> job SET async_job.job_executing_msid=null WHERE async_job.id = 831176
> Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
> at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> Due to this exception, the queue item is not purged for the first vm worker job, then all the following operations for the same VM will get stuck.



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