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From nvazquez <>
Subject [GitHub] cloudstack pull request #1905: CLOUDSTACK-9738: Optimize vm expunge process ...
Date Fri, 13 Jan 2017 14:06:20 GMT
GitHub user nvazquez opened a pull request:

    CLOUDSTACK-9738: Optimize vm expunge process for instances with vm snapshots

    ## Description
    It was noticed that expunging instances with many vm snapshots took a look of time, as
hypervisor received as many tasks as vm snapshots instance had, apart from the delete vm task.
We propose a way to optimize this process for instances with vm snapshots by sending only
one delete task to hypervisor, which will delete vm and its snapshots
    ## Use cases
    1. deleteVMsnapohsot-> no changes to current behavior
    2. destroyVM with expunge=false ->  no actions to VMsnaphsot is performed at the moment.
When VM cleanup thread is executed it will perform the same sequence as (3). If instance is
recovered before expunged by the cleanup thread it will remain intact with VMSnapshot chain
    3. destroyVM with expunge=true:
       * Vmsnaphsot is marked with removed timestamp and state = Expunging in DB
       * VM is deleted in HW

You can merge this pull request into a Git repository by running:

    $ git pull expungeVmRefactor

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1905
commit f5bebb172c36710a3c795a0df542fe443c71a2c9
Author: nvazquez <>
Date:   2017-01-09T20:08:32Z

    CLOUDSTACK-9738: Optimize vm expunge process for instances with vm snapshots


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