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CA-373551: register for host events rather than task in events_from_xapi #4870

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merged 2 commits into from
Dec 12, 2022
Merged

CA-373551: register for host events rather than task in events_from_xapi #4870

merged 2 commits into from
Dec 12, 2022

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robhoes
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@robhoes robhoes commented Dec 12, 2022

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@robhoes
Update lifecycle for pool.migration_compression
cde2822 
Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
@robhoes
CA-373551: register for host events rather than task in events_from_xapi
6568cab 
A recent change registered for events on the task that was used by the
events_from_xapi thread in xapi_xenops. This is so that the event loop
can be woken up by injecting an event into this task, without the need
to logout its session (as previously done). The problem is that this
introduced a task in the DB that is forever "pending", which has
unwanted side-effects. For example, it gets GC'ed after 24 hours, and
also gets destroyed if the coordinator is restarted.

Switch to registering the host object for the localhost instead, which
should be more stable.

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
psafont
psafont approved these changes Dec 12, 2022
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With his change now the loop is woken every time a field from that host object is changed. Even with the increased rate, this seems benign.

@robhoes robhoes marked this pull request as ready for review December 12, 2022 16:03
edwintorok
edwintorok approved these changes Dec 12, 2022
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These events will probably also be visible to xencenter, but if they're not too frequent it shouldn't be a problem.

@robhoes robhoes merged commit 2784cf6 into xapi-project:master Dec 12, 2022
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@psafont psafont psafont approved these changes

@edwintorok edwintorok edwintorok approved these changes

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@robhoes @edwintorok @psafont