xapi-project
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xen-api
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15559456363
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web-flowParallelize host evacuation even more (#6514) With bab83d9d7, host evacuation was parallelized by grouping VMs into batches, and starting a new batch once the previous one has finished. This means that a single slow VM can potentially slow down the whole evacuation. Add a new `Tasks.wait_for_all_with_callback` function that will invoke a callback every time one of the tasks is deemed non-pending. This will allow its users to: 1) track the progress of tasks within the submitted batch 2) schedule new tasks to replace the completed ones Use the new `Tasks.wait_for_all_with_callback` in `xapi_host` to schedule a new migration as soon as any of the previous ones have finished, thus maintaining a constant flow of `n` migrations. Additionally expose the `evacuate-batch-size` parameter in the CLI, this was missed when it was originally added with the CLI setting it to `0` (pick the default) all the time. === Manually tested multiple times, confirmed to not break anything and to actually maintain a constant flow of migrations. This should greatly speed up host evacuations when there is a combination of bigger and smaller VMs (in terms of memory/disk, or VMs with some other reason for slow migration) on the host
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