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From "Mike Tutkowski (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CLOUDSTACK-8862) Issuing multiple attach-volume commands simultaneously can be problematic
Date Tue, 15 Sep 2015 19:00:46 GMT
Mike Tutkowski created CLOUDSTACK-8862:
------------------------------------------

             Summary: 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: 4.5.2, 4.5.1, 4.5.0, 4.6.0
         Environment: N/A
            Reporter: Mike Tutkowski
             Fix For: 4.6.0


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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