Make Repository.getRepositoryData an Async API (#49299)#49312
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original-brownbear merged 1 commit intoelastic:7.xfrom Nov 19, 2019
original-brownbear:49299-7.x
Merged
Make Repository.getRepositoryData an Async API (#49299)#49312original-brownbear merged 1 commit intoelastic:7.xfrom original-brownbear:49299-7.x
original-brownbear merged 1 commit intoelastic:7.xfrom
original-brownbear:49299-7.x
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This API call in most implementations is fairly IO heavy and slow so it is more natural to be async in the first place. Concretely though, this change is a prerequisite of #49060 since determining the repository generation from the cluster state introduces situations where this call would have to wait for other operations to finish. Doing so in a blocking manner would break `SnapshotResiliencyTests` and waste a thread. Also, this sets up the possibility to in the future make use of async IO where provided by the underlying Repository implementation. In a follow-up `SnapshotsService#getRepositoryData` will be made async as well (did not do it here, since it's another huge change to do so). Note: This change for now does not alter the threading behaviour in any way (since `Repository#getRepositoryData` isn't forking) and is purely mechanical.
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Pinging @elastic/es-distributed (:Distributed/Snapshot/Restore) |
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This API call in most implementations is fairly IO heavy and slow
so it is more natural to be async in the first place.
Concretely though, this change is a prerequisite of #49060 since
determining the repository generation from the cluster state
introduces situations where this call would have to wait for other
operations to finish. Doing so in a blocking manner would break
SnapshotResiliencyTestsand waste a thread.Also, this sets up the possibility to in the future make use of async IO
where provided by the underlying Repository implementation.
In a follow-up
SnapshotsService#getRepositoryDatawill be made asyncas well (did not do it here, since it's another huge change to do so).
Note: This change for now does not alter the threading behaviour in any way (since
Repository#getRepositoryDataisn't forking) and is purely mechanical.backport of #49299