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Message #19241
[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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