[GitHub] [lucenenet] jeme commented on issue #763: Support async task

[GitBox <gi...@apache.org>]

jeme commented on issue #763:
URL: https://github.com/apache/lucenenet/issues/763#issuecomment-1322012531

   > Note that there is a [Lucene.Net.Replicator](https://lucenenet.apache.org/docs/4.8.0-beta00016/api/replicator/Lucene.Net.Replicator.html) module that is designed to synchronize an index across multiple servers by hosting a listener on a server and having each client request a copy periodically. I haven't tried, but I suspect there is a way to utilize it to safely copy the index to cloud storage at periodic intervals. I wouldn't recommend copying the index outside of a locking context, though, because Lucene.NET may lock the files at unpredictable times and it may not be practical to copy them without getting copy errors.
   
   The Replicator can probably do that but I don't think it's needed at all to do a feature like that, however the replicator holds the answer to how so it's worth looking at the code.
   
   But it should be as simple as using the SnapshotDeletionPolicy (Also required by the Replicator) then at intervals do a snapshot by calling the `Snapshot` method which returns a `IndexCommit` then copy all the files of that commit.
   
   We do that targeting the local file system to make dated snapshots of our index. Going from building snapshots targeting the local file system to putting them into cloud storage shouldn't be much of a challenge.
   


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