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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-2486) Deleting the host_details and inserting them back can lead to mysql deadlock
Date Wed, 15 May 2013 18:35:18 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-2486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13658641#comment-13658641
] 

ASF subversion and git services commented on CLOUDSTACK-2486:
-------------------------------------------------------------

Commit a13dd59d167e70b3991ea666b83bdd240aa5e786 in branch refs/heads/master from Prachi Damle
<prachi@cloud.com>
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=a13dd59 ]

CLOUDSTACK-2486: Deleting the host_details and inserting them back can lead to mysql deadlock

- Instead of using separate delete and insert, we will use ON DUPLICATE KEY UPDATE to avoid
the MySQL deadlock

                
> Deleting the host_details and inserting them back can lead to mysql deadlock
> ----------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-2486
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-2486
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Management Server
>    Affects Versions: 4.2.0
>            Reporter: Prachi Damle
>            Assignee: Prachi Damle
>
> When host tries to connect to management server, the old host_details are deleted and
new records are inserted. MySQL deadlock is seen sometimes during this delete and insert on
the same table. If this error happens, host connection fails.
> a) This issue is intermittent issue seen with MySQL. It seems to happen when we are deleting
and inserting records in the same table in one transaction.
> b)CS auto-corrects this error state:
> CloudStack has host connection 'retry' mechanism where we try to connect back to the
host. This retry mechanism corrects this issue because the DB issue is intermittent and eventually
the hosts connect back.
> Hence this does not affect the CS functionality. 

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