* [Qemu-devel] [PATCH v2] qemu-iotests: Extend non-shared storage migration test (194)
@ 2017-08-29 9:06 Kashyap Chamarthy
2017-08-29 14:19 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
0 siblings, 1 reply; 3+ messages in thread
From: Kashyap Chamarthy @ 2017-08-29 9:06 UTC (permalink / raw)
To: qemu-devel
Cc: qemu-block, stefanha, famz, eblake, kwolf, dgilbert, Kashyap Chamarthy
This is the follow-up patch that was discussed[*] as part of feedback to
qemu-iotest 194.
Changes in this patch:
- Supply 'job-id' parameter to `drive-mirror` invocation.
- Issue QMP `block-job-cancel` command on the source QEMU to
gracefully complete `drive-mirror` operation.
- Stop the NBD server on the destination QEMU.
- Finally, check for both the events: MIGRATION and
BLOCK_JOB_COMPLETED
With the above, the test will also be (almost) in sync with the
procedure outlined in the document 'live-block-operations.rst'[+]
(section: "QMP invocation for live storage migration with
``drive-mirror`` + NBD").
[*] https://lists.nongnu.org/archive/html/qemu-devel/2017-08/msg04820.html
-- qemu-iotests: add 194 non-shared storage migration test
[+] https://git.qemu.org/gitweb.cgi?p=qemu.git;a=blob;f=docs/interop/live-block-operations.rst
Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
---
Changes in v2:
- Check for both the events: MIGRATION and BLOCK_JOB_COMPLETED (Eric)
---
tests/qemu-iotests/194 | 25 +++++++++++++++++++------
tests/qemu-iotests/194.out | 11 ++++++++---
2 files changed, 27 insertions(+), 9 deletions(-)
diff --git a/tests/qemu-iotests/194 b/tests/qemu-iotests/194
index 8028111e21bed5cf4a2e8e32dc04aa5a9ea9caca..9d81189fe3e790d060da5a0fd41836f4b57f95c7 100755
--- a/tests/qemu-iotests/194
+++ b/tests/qemu-iotests/194
@@ -46,16 +46,17 @@ iotests.log('Launching NBD server on destination...')
iotests.log(dest_vm.qmp('nbd-server-start', addr={'type': 'unix', 'data': {'path': nbd_sock_path}}))
iotests.log(dest_vm.qmp('nbd-server-add', device='drive0', writable=True))
-iotests.log('Starting drive-mirror on source...')
+iotests.log('Starting `drive-mirror` on source...')
iotests.log(source_vm.qmp(
'drive-mirror',
device='drive0',
target='nbd+unix:///drive0?socket={0}'.format(nbd_sock_path),
sync='full',
format='raw', # always raw, the server handles the format
- mode='existing'))
+ mode='existing',
+ job_id='mirror-job0'))
-iotests.log('Waiting for drive-mirror to complete...')
+iotests.log('Waiting for `drive-mirror` to complete...')
iotests.log(source_vm.event_wait('BLOCK_JOB_READY'),
filters=[iotests.filter_qmp_event])
@@ -66,8 +67,20 @@ dest_vm.qmp('migrate-set-capabilities',
capabilities=[{'capability': 'events', 'state': True}])
iotests.log(source_vm.qmp('migrate', uri='unix:{0}'.format(migration_sock_path)))
+iotests.log('Gracefully ending the `drive-mirror` job on source...')
+iotests.log(source_vm.qmp('block-job-cancel', device='mirror-job0'))
+
+iotests.log('Stopping the NBD server on destination...')
+iotests.log(dest_vm.qmp('nbd-server-stop'))
+
while True:
- event = source_vm.event_wait('MIGRATION')
- iotests.log(event, filters=[iotests.filter_qmp_event])
- if event['data']['status'] in ('completed', 'failed'):
+ event1 = source_vm.event_wait('MIGRATION')
+ iotests.log(event1, filters=[iotests.filter_qmp_event])
+ if event1['data']['status'] in ('completed', 'failed'):
+ break
+
+while True:
+ event2 = source_vm.event_wait('BLOCK_JOB_COMPLETED')
+ iotests.log(event2, filters=[iotests.filter_qmp_event])
+ if event2['event'] == 'BLOCK_JOB_COMPLETED':
break
diff --git a/tests/qemu-iotests/194.out b/tests/qemu-iotests/194.out
index ae501fecacb706b1851cb9063ce9c9d5a28bb7ea..a461d7e21abb2dee54d72d93d644100f9fbcb17d 100644
--- a/tests/qemu-iotests/194.out
+++ b/tests/qemu-iotests/194.out
@@ -2,12 +2,17 @@ Launching VMs...
Launching NBD server on destination...
{u'return': {}}
{u'return': {}}
-Starting drive-mirror on source...
+Starting `drive-mirror` on source...
{u'return': {}}
-Waiting for drive-mirror to complete...
-{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'device': u'drive0', u'type': u'mirror', u'speed': 0, u'len': 1073741824, u'offset': 1073741824}, u'event': u'BLOCK_JOB_READY'}
+Waiting for `drive-mirror` to complete...
+{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'device': u'mirror-job0', u'type': u'mirror', u'speed': 0, u'len': 1073741824, u'offset': 1073741824}, u'event': u'BLOCK_JOB_READY'}
Starting migration...
{u'return': {}}
+Gracefully ending the `drive-mirror` job on source...
+{u'return': {}}
+Stopping the NBD server on destination...
+{u'return': {}}
{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'status': u'setup'}, u'event': u'MIGRATION'}
{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'status': u'active'}, u'event': u'MIGRATION'}
{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'status': u'completed'}, u'event': u'MIGRATION'}
+{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'device': u'mirror-job0', u'type': u'mirror', u'speed': 0, u'len': 1073741824, u'offset': 1073741824}, u'event': u'BLOCK_JOB_COMPLETED'}
--
2.9.5
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [Qemu-block] [PATCH v2] qemu-iotests: Extend non-shared storage migration test (194)
2017-08-29 9:06 [Qemu-devel] [PATCH v2] qemu-iotests: Extend non-shared storage migration test (194) Kashyap Chamarthy
@ 2017-08-29 14:19 ` Stefan Hajnoczi
2017-08-29 14:47 ` Kashyap Chamarthy
0 siblings, 1 reply; 3+ messages in thread
From: Stefan Hajnoczi @ 2017-08-29 14:19 UTC (permalink / raw)
To: Kashyap Chamarthy; +Cc: qemu-devel, kwolf, famz, qemu-block, dgilbert, stefanha
On Tue, Aug 29, 2017 at 11:06:22AM +0200, Kashyap Chamarthy wrote:
> This is the follow-up patch that was discussed[*] as part of feedback to
> qemu-iotest 194.
>
> Changes in this patch:
>
> - Supply 'job-id' parameter to `drive-mirror` invocation.
>
> - Issue QMP `block-job-cancel` command on the source QEMU to
> gracefully complete `drive-mirror` operation.
>
> - Stop the NBD server on the destination QEMU.
>
> - Finally, check for both the events: MIGRATION and
> BLOCK_JOB_COMPLETED
>
> With the above, the test will also be (almost) in sync with the
> procedure outlined in the document 'live-block-operations.rst'[+]
> (section: "QMP invocation for live storage migration with
> ``drive-mirror`` + NBD").
>
> [*] https://lists.nongnu.org/archive/html/qemu-devel/2017-08/msg04820.html
> -- qemu-iotests: add 194 non-shared storage migration test
> [+] https://git.qemu.org/gitweb.cgi?p=qemu.git;a=blob;f=docs/interop/live-block-operations.rst
>
> Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
> ---
> Changes in v2:
> - Check for both the events: MIGRATION and BLOCK_JOB_COMPLETED (Eric)
> ---
> tests/qemu-iotests/194 | 25 +++++++++++++++++++------
> tests/qemu-iotests/194.out | 11 ++++++++---
> 2 files changed, 27 insertions(+), 9 deletions(-)
>
> diff --git a/tests/qemu-iotests/194 b/tests/qemu-iotests/194
> index 8028111e21bed5cf4a2e8e32dc04aa5a9ea9caca..9d81189fe3e790d060da5a0fd41836f4b57f95c7 100755
> --- a/tests/qemu-iotests/194
> +++ b/tests/qemu-iotests/194
> @@ -46,16 +46,17 @@ iotests.log('Launching NBD server on destination...')
> iotests.log(dest_vm.qmp('nbd-server-start', addr={'type': 'unix', 'data': {'path': nbd_sock_path}}))
> iotests.log(dest_vm.qmp('nbd-server-add', device='drive0', writable=True))
>
> -iotests.log('Starting drive-mirror on source...')
> +iotests.log('Starting `drive-mirror` on source...')
> iotests.log(source_vm.qmp(
> 'drive-mirror',
> device='drive0',
> target='nbd+unix:///drive0?socket={0}'.format(nbd_sock_path),
> sync='full',
> format='raw', # always raw, the server handles the format
> - mode='existing'))
> + mode='existing',
> + job_id='mirror-job0'))
>
> -iotests.log('Waiting for drive-mirror to complete...')
> +iotests.log('Waiting for `drive-mirror` to complete...')
> iotests.log(source_vm.event_wait('BLOCK_JOB_READY'),
> filters=[iotests.filter_qmp_event])
>
> @@ -66,8 +67,20 @@ dest_vm.qmp('migrate-set-capabilities',
> capabilities=[{'capability': 'events', 'state': True}])
> iotests.log(source_vm.qmp('migrate', uri='unix:{0}'.format(migration_sock_path)))
>
> +iotests.log('Gracefully ending the `drive-mirror` job on source...')
> +iotests.log(source_vm.qmp('block-job-cancel', device='mirror-job0'))
Two issues:
1. Migration may not have completed yet so drive-mirror cannot be
stopped here. We need to wait for migration to complete on the
source before cancelling the block job.
2. block-job-cancel is asynchronous. The block job may still be running
after this returns. Therefore it may still be using the NBD drive...
> +
> +iotests.log('Stopping the NBD server on destination...')
> +iotests.log(dest_vm.qmp('nbd-server-stop'))
...and that races with this command on the destination.
We need to wait for the BLOCK_JOB_CANCELLED/COMPLETED event on the
source QEMU before stopping the NBD server on the destination.
> +
> while True:
> - event = source_vm.event_wait('MIGRATION')
> - iotests.log(event, filters=[iotests.filter_qmp_event])
> - if event['data']['status'] in ('completed', 'failed'):
> + event1 = source_vm.event_wait('MIGRATION')
> + iotests.log(event1, filters=[iotests.filter_qmp_event])
> + if event1['data']['status'] in ('completed', 'failed'):
> + break
> +
> +while True:
> + event2 = source_vm.event_wait('BLOCK_JOB_COMPLETED')
> + iotests.log(event2, filters=[iotests.filter_qmp_event])
> + if event2['event'] == 'BLOCK_JOB_COMPLETED':
> break
> diff --git a/tests/qemu-iotests/194.out b/tests/qemu-iotests/194.out
> index ae501fecacb706b1851cb9063ce9c9d5a28bb7ea..a461d7e21abb2dee54d72d93d644100f9fbcb17d 100644
> --- a/tests/qemu-iotests/194.out
> +++ b/tests/qemu-iotests/194.out
> @@ -2,12 +2,17 @@ Launching VMs...
> Launching NBD server on destination...
> {u'return': {}}
> {u'return': {}}
> -Starting drive-mirror on source...
> +Starting `drive-mirror` on source...
> {u'return': {}}
> -Waiting for drive-mirror to complete...
> -{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'device': u'drive0', u'type': u'mirror', u'speed': 0, u'len': 1073741824, u'offset': 1073741824}, u'event': u'BLOCK_JOB_READY'}
> +Waiting for `drive-mirror` to complete...
> +{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'device': u'mirror-job0', u'type': u'mirror', u'speed': 0, u'len': 1073741824, u'offset': 1073741824}, u'event': u'BLOCK_JOB_READY'}
> Starting migration...
> {u'return': {}}
> +Gracefully ending the `drive-mirror` job on source...
> +{u'return': {}}
> +Stopping the NBD server on destination...
> +{u'return': {}}
> {u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'status': u'setup'}, u'event': u'MIGRATION'}
> {u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'status': u'active'}, u'event': u'MIGRATION'}
> {u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'status': u'completed'}, u'event': u'MIGRATION'}
> +{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'device': u'mirror-job0', u'type': u'mirror', u'speed': 0, u'len': 1073741824, u'offset': 1073741824}, u'event': u'BLOCK_JOB_COMPLETED'}
> --
> 2.9.5
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [Qemu-block] [PATCH v2] qemu-iotests: Extend non-shared storage migration test (194)
2017-08-29 14:19 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
@ 2017-08-29 14:47 ` Kashyap Chamarthy
0 siblings, 0 replies; 3+ messages in thread
From: Kashyap Chamarthy @ 2017-08-29 14:47 UTC (permalink / raw)
To: Stefan Hajnoczi; +Cc: qemu-devel, kwolf, famz, qemu-block, dgilbert, stefanha
On Tue, Aug 29, 2017 at 03:19:54PM +0100, Stefan Hajnoczi wrote:
> On Tue, Aug 29, 2017 at 11:06:22AM +0200, Kashyap Chamarthy wrote:
[...]
> > +iotests.log('Gracefully ending the `drive-mirror` job on source...')
> > +iotests.log(source_vm.qmp('block-job-cancel', device='mirror-job0'))
>
> Two issues:
>
> 1. Migration may not have completed yet so drive-mirror cannot be
> stopped here. We need to wait for migration to complete on the
> source before cancelling the block job.
>
> 2. block-job-cancel is asynchronous. The block job may still be running
> after this returns. Therefore it may still be using the NBD drive...
>
> > +
> > +iotests.log('Stopping the NBD server on destination...')
> > +iotests.log(dest_vm.qmp('nbd-server-stop'))
>
> ...and that races with this command on the destination.
>
> We need to wait for the BLOCK_JOB_CANCELLED/COMPLETED event on the
> source QEMU before stopping the NBD server on the destination.
Yes, both good points. How about the following `diff` to address both
the issues you raised?
#----------------------------------------------------------------------
diff --git a/tests/qemu-iotests/194 b/tests/qemu-iotests/194
index 9d81189..a3e3bad 100755
--- a/tests/qemu-iotests/194
+++ b/tests/qemu-iotests/194
@@ -67,20 +67,18 @@ dest_vm.qmp('migrate-set-capabilities',
capabilities=[{'capability': 'events', 'state': True}])
iotests.log(source_vm.qmp('migrate', uri='unix:{0}'.format(migration_sock_path)))
-iotests.log('Gracefully ending the `drive-mirror` job on source...')
-iotests.log(source_vm.qmp('block-job-cancel', device='mirror-job0'))
-
-iotests.log('Stopping the NBD server on destination...')
-iotests.log(dest_vm.qmp('nbd-server-stop'))
-
while True:
event1 = source_vm.event_wait('MIGRATION')
iotests.log(event1, filters=[iotests.filter_qmp_event])
if event1['data']['status'] in ('completed', 'failed'):
+ iotests.log('Gracefully ending the `drive-mirror` job on source...')
+ iotests.log(source_vm.qmp('block-job-cancel', device='mirror-job0'))
break
while True:
event2 = source_vm.event_wait('BLOCK_JOB_COMPLETED')
iotests.log(event2, filters=[iotests.filter_qmp_event])
if event2['event'] == 'BLOCK_JOB_COMPLETED':
+ iotests.log('Stopping the NBD server on destination...')
+ iotests.log(dest_vm.qmp('nbd-server-stop'))
break
#----------------------------------------------------------------------
And the output would be:
#----------------------------------------------------------------------
Launching VMs...
Launching NBD server on destination...
{u'return': {}}
{u'return': {}}
Starting `drive-mirror` on source...
{u'return': {}}
Waiting for `drive-mirror` to complete...
{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'device': u'mirror-job0', u'type': u'mirror', u'speed': 0, u'len': 1073741824, u'offset': 1073741824}, u'event': u'BLOCK_JOB_READY'}
Starting migration...
{u'return': {}}
{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'status': u'setup'}, u'event': u'MIGRATION'}
{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'status': u'active'}, u'event': u'MIGRATION'}
{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'status': u'completed'}, u'event': u'MIGRATION'}
Gracefully ending the `drive-mirror` job on source...
{u'return': {}}
{u'timestamp': {u'seconds': 'SECS', u'microseconds': 'USECS'}, u'data': {u'device': u'mirror-job0', u'type': u'mirror', u'speed': 0, u'len': 1073741824, u'offset': 1073741824}, u'event': u'BLOCK_JOB_COMPLETED'}
Stopping the NBD server on destination...
{u'return': {}}
#----------------------------------------------------------------------
--
/kashyap
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2017-08-29 9:06 [Qemu-devel] [PATCH v2] qemu-iotests: Extend non-shared storage migration test (194) Kashyap Chamarthy
2017-08-29 14:19 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
2017-08-29 14:47 ` Kashyap Chamarthy
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