[DISCUSS][ASK] Should agent wait for pending tasks on (mgmt server) disconnection?

[Rohit Yadav]

All,


Historically, when the agent (kvm, ssvm, cpvm) is disconnected from the 
management server (say due to mgmt server restart etc), the reconnection logic 
waits for any pending tasks/commands to complete before reconnection attempts 
are made. I tried to search git history but could not find a reason, can anyone 
share why we may need this?


Based on the reported issue:

https://github.com/apache/cloudstack/issues/2633


I've a working patch which removes this limitation:

https://github.com/apache/cloudstack/pull/2638


>From testing with various combinations of tasks, I found that when that 
>happens even if the pending task succeeds it fails to send an Answer to the 
>mgmt server, therefore from the control plane's perspective that task is still 
>pending/on-going.


When the mgmt server comes back online, and the agent finally reconnects 
(pending on how long the pending task took) the executed operation is still 
pending in mgmt server's view and may sometimes require manual cleanups in 
database. By removing the limitation in above PR, at least the agent reconnects 
faster while of the failure/fault behaviours remain the same. A bigger design 
fix would be to make management server asynchronous of agent side 
answer/response handling.


- Rohit





rohit.ya...@shapeblue.com 
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REMINDER: Apache EU Roadshow 2018 schedule announced!

[sharan]

Hello Apache Supporters and Enthusiasts

This is a reminder that the schedule for the Apache EU Roadshow 2018 in 
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