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https://issues.apache.org/jira/browse/CLOUDSTACK-1522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594119#comment-13594119
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ASF subversion and git services commented on CLOUDSTACK-1522:
-------------------------------------------------------------
Commit dd721a832a408385d126975d7ab7d76b03ad8414 in branch refs/heads/master
from Sheng Yang <sheng.y...@citrix.com>
[ https://git-wip-us.apache.org/repos/asf?p=incubator-cloudstack.git;h=dd721a8 ]
CLOUDSTACK-1522: Add timestamp to lock
Use higher precision timestamp rather than file timestamp to find out the order
of lock requester
> File lock mechanism cannot get correct order when two process want to get the
> lock in the same second
> -----------------------------------------------------------------------------------------------------
>
> Key: CLOUDSTACK-1522
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-1522
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Affects Versions: 4.0.0, 4.1.0
> Reporter: Sheng Yang
> Assignee: Sheng Yang
> Priority: Critical
> Fix For: 4.2.0
>
>
> The file lock mechanism is trying to provide a function that the lock
> requester would get the lock in the order they requested. This is implemented
> by using lock file's timestamp.
> But in ext3, timestamp's precision is only in seconds, so when two requester
> want to get the same lock in the same second, the order cannot be guaranteed.
> This caused issue in redundant router, when keepalived detected MASTER
> disappear then soon MASTER back again, keepalived would call switch to MASTER
> script first, then immediately call switch to BACKUP script, which may result
> in BACKUP script is called before MASTER script, since they're executed in
> the same second.
> File lock need to get high precision for determining the order of requester.
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