[jira] [Assigned] (IGNITE-16150) Get rid of redundant copying of files after downloading when restoring a snapshot.

["Pavel Pereslegin (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-16150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Pereslegin reassigned IGNITE-16150:
-----------------------------------------

    Assignee: Pavel Pereslegin

> Get rid of redundant copying of files after downloading when restoring a snapshot. 
> -----------------------------------------------------------------------------------
>
>                 Key: IGNITE-16150
>                 URL: https://issues.apache.org/jira/browse/IGNITE-16150
>             Project: Ignite
>          Issue Type: Improvement
>    Affects Versions: 2.12
>            Reporter: Pavel Pereslegin
>            Assignee: Pavel Pereslegin
>            Priority: Major
>              Labels: iep-43
>
> During the snapshot restore procedure after retrieving the partition file from the remote node, we create an additional copy of this file.
> {code:java}
> 	for (Map.Entry<UUID, Map<Integer, Set<Integer>>> m : snpAff.entrySet()) {
> 		ctx.cache().context().snapshotMgr()
> 			.requestRemoteSnapshotFiles(m.getKey(),
> 				opCtx0.snpName,
> 				m.getValue(),
> 				opCtx0.stopChecker,
> 				(snpFile, t) -> {
> 					...
> 					Path partFile = Paths.get(tmpCacheDir.getAbsolutePath(), snpFile.getName());
> 					try {
> 						IgniteSnapshotManager.copy(snpMgr.ioFactory(),
> 							snpFile,
> 							partFile.toFile(),
> 							snpFile.length());
> 					...
> {code}
> File copying is redundant here and can have significant performance overhead.
> Instead, we have to download the file to the target directory (and rename it to the desired name if necessary).



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