[jira] [Updated] (CLOUDSTACK-8862) Issuing multiple attach-volume commands simultaneously can be problematic

["Pierre-Luc Dion (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CLOUDSTACK-8862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pierre-Luc Dion updated CLOUDSTACK-8862:
----------------------------------------
    Fix Version/s:     (was: 4.6.1)
                   4.6.2

> Issuing multiple attach-volume commands simultaneously can be problematic
> -------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-8862
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8862
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Management Server
>    Affects Versions: 4.5.0, 4.5.1, 4.5.2, 4.6.0
>         Environment: N/A
>            Reporter: Mike Tutkowski
>             Fix For: 4.6.2
>
>
> If a user submits two volumeAttach commands around the same time, the first one can succeed while the second one can fail and can lead CloudStack to ask the underlying storage plug-in to remove the volume from a given ACL (but the volume should be in the ACL because the first attachVolume command succeeded).
> A somewhat similar problem can happen if you submit the second attachVolume command to another VM in the same cluster.
> Proposed solution:
> A data volume should make use of a new column in the volumes table: attach_state (or some name like that).
> This column can have five possible values: null (for root disks), detached (default state for data volumes), attaching, attached, and detaching.
> When an attachVolume command is submitted, the volume should immediately be placed into the "attaching" state. If a transition to that state is not possible, an exception is thrown (for example, if you're already in the "attached" state, you can't transition to the "attaching" state).
> A similar kind of logic already exists for volume snapshots.



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