rpuch commented on code in PR #6229:
URL: https://github.com/apache/ignite-3/pull/6229#discussion_r2197847533
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modules/storage-api/src/testFixtures/java/org/apache/ignite/internal/storage/engine/AbstractPersistentStorageEngineTest.java:
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@@ -70,6 +70,9 @@
* because it doesn't limit the usage of the engine with a single table.
*/
public abstract class AbstractPersistentStorageEngineTest extends
AbstractStorageEngineTest {
+ /** Makes sure that table destruction is persisted durably. */
+ protected abstract void persistTableDestructionIfNeeded();
Review Comment:
Technically, it can, but
1. It's not needed (we'll ensure durability of destruction on the higher
level; this PR is about building this higher-level mechanism)
2. It's not free (it will require a flush, which we don't need per item 1)
3. It will bring additional complexity to the code (necessity to call flush,
some methods' return values will be `CompletableFuture<Void>` vs void)
So it seems more rational to not introduce such guarantees.
The fact that pagemem-based storages give these guarantees is a lucky
coincidence (we use file/dir removal there, which is fast). Also, pagemem-based
storages provide these guarantees only while we only think about Ignite
restart/crash; if a machine or OS crashes, those file-based guarantees vanish
as it seems that we don't do dir fsync when deleting files, and not all FSs use
journals.
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