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[Bug 1692397] Re: hypervisor statistics could be incorrect

 

** Also affects: nova (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1692397

Title:
  hypervisor statistics could be incorrect

Status in Ubuntu Cloud Archive:
  Fix Released
Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) newton series:
  Fix Committed
Status in OpenStack Compute (nova) ocata series:
  Fix Committed
Status in nova package in Ubuntu:
  Fix Released
Status in nova source package in Xenial:
  New

Bug description:
  Hypervisor statistics could be incorrect:

  When we killed a nova-compute service and deleted the service from nova DB, and then
  start the nova-compute service again, the result of Hypervisor/statistics API (nova hypervisor-stats) will be
  incorrect;

  How to reproduce:

  Step1. Check the correct statistics before we do anything:
  root@SZX1000291919:/opt/stack/nova# nova  hypervisor-stats
  +----------------------+-------+
  | Property             | Value |
  +----------------------+-------+
  | count                | 1     |
  | current_workload     | 0     |
  | disk_available_least | 14    |
  | free_disk_gb         | 34    |
  | free_ram_mb          | 6936  |
  | local_gb             | 35    |
  | local_gb_used        | 1     |
  | memory_mb            | 7960  |
  | memory_mb_used       | 1024  |
  | running_vms          | 1     |
  | vcpus                | 8     |
  | vcpus_used           | 1     |
  +----------------------+-------+

  Step2. Kill the compute service:
  root@SZX1000291919:/var/log/nova# ps -ef | grep nova-com
  root     120419 120411  0 11:06 pts/27   00:00:00 sg libvirtd /usr/local/bin/nova-compute --config-file /etc/nova/nova.conf --log-file /var/log/nova/nova-compute.log
  root     120420 120419  0 11:06 pts/27   00:00:07 /usr/bin/python /usr/local/bin/nova-compute --config-file /etc/nova/nova.conf --log-file /var/log/nova/nova-compute.log

  root@SZX1000291919:/var/log/nova# kill -9 120419
  root@SZX1000291919:/var/log/nova# /usr/local/bin/stack: line 19: 120419 Killed                  sg libvirtd '/usr/local/bin/nova-compute --config-file /etc/nova/nova.conf --log-file /var/log/nova/nova-compute.log' > /dev/null 2>&1

  root@SZX1000291919:/var/log/nova# nova service-list
  +----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+
  | Id | Binary           | Host          | Zone     | Status  | State | Updated_at                 | Disabled Reason |
  +----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+
  | 4  | nova-conductor   | SZX1000291919 | internal | enabled | up    | 2017-05-22T03:24:36.000000 | -               |
  | 6  | nova-scheduler   | SZX1000291919 | internal | enabled | up    | 2017-05-22T03:24:36.000000 | -               |
  | 7  | nova-consoleauth | SZX1000291919 | internal | enabled | up    | 2017-05-22T03:24:37.000000 | -               |
  | 8  | nova-compute     | SZX1000291919 | nova     | enabled | down  | 2017-05-22T03:23:38.000000 | -               |
  | 9  | nova-cert        | SZX1000291919 | internal | enabled | down  | 2017-05-17T02:50:13.000000 | -               |
  +----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+

  Step3. Delete the service from DB:

  root@SZX1000291919:/var/log/nova# nova service-delete 8
  root@SZX1000291919:/var/log/nova# nova service-list
  +----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+
  | Id | Binary           | Host          | Zone     | Status  | State | Updated_at                 | Disabled Reason |
  +----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+
  | 4  | nova-conductor   | SZX1000291919 | internal | enabled | up    | 2017-05-22T03:25:16.000000 | -               |
  | 6  | nova-scheduler   | SZX1000291919 | internal | enabled | up    | 2017-05-22T03:25:16.000000 | -               |
  | 7  | nova-consoleauth | SZX1000291919 | internal | enabled | up    | 2017-05-22T03:25:17.000000 | -               |
  | 9  | nova-cert        | SZX1000291919 | internal | enabled | down  | 2017-05-17T02:50:13.000000 | -               |
  +----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+

  Step4. Start the compute service again:
  root@SZX1000291919:/var/log/nova# nova service-list
  +----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+
  | Id | Binary           | Host          | Zone     | Status  | State | Updated_at                 | Disabled Reason |
  +----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+
  | 4  | nova-conductor   | SZX1000291919 | internal | enabled | up    | 2017-05-22T03:48:55.000000 | -               |
  | 6  | nova-scheduler   | SZX1000291919 | internal | enabled | up    | 2017-05-22T03:48:56.000000 | -               |
  | 7  | nova-consoleauth | SZX1000291919 | internal | enabled | up    | 2017-05-22T03:48:56.000000 | -               |
  | 9  | nova-cert        | SZX1000291919 | internal | enabled | down  | 2017-05-17T02:50:13.000000 | -               |
  | 10 | nova-compute     | SZX1000291919 | nova     | enabled | up    | 2017-05-22T03:48:57.000000 | -               |
  +----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+

  Step5. Check again the hyervisor statistics, the result is incorrect:

  root@SZX1000291919:/var/log/nova# nova  hypervisor-stats
  +----------------------+-------+
  | Property             | Value |
  +----------------------+-------+
  | count                | 2     |
  | current_workload     | 0     |
  | disk_available_least | 28    |
  | free_disk_gb         | 68    |
  | free_ram_mb          | 13872 |
  | local_gb             | 70    |
  | local_gb_used        | 2     |
  | memory_mb            | 15920 |
  | memory_mb_used       | 2048  |
  | running_vms          | 2     |
  | vcpus                | 16    |
  | vcpus_used           | 2     |
  +----------------------+-------+

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