Pavel Pereslegin created IGNITE-16150:
-----------------------------------------
Summary: 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
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(),
...
{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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