rkhachatryan commented on a change in pull request #17203:
URL: https://github.com/apache/flink/pull/17203#discussion_r710125481
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File path:
flink-state-backends/flink-statebackend-changelog/src/main/java/org/apache/flink/state/changelog/restore/ChangelogBackendRestoreOperation.java
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@@ -80,14 +89,19 @@
ChangelogKeyedStateBackend<?> backend,
ChangelogStateBackendHandle backendHandle,
StateChangelogHandleReader<T> changelogHandleReader,
- ClassLoader classLoader)
+ ClassLoader classLoader,
+ Map<UUID, Map<Short, StateID>> metadataByBackend)
throws Exception {
for (ChangelogStateHandle changelogHandle :
backendHandle.getNonMaterializedStateHandles()) {
+ Map<Short, StateID> stateIds =
+ metadataByBackend.computeIfAbsent(
+ backendHandle.getBackendID(), ign -> new
HashMap<>());
Review comment:
You are right, I've removed backend ID (both from handle and from
backend itself).
I started to
[refactor](https://github.com/rkhachatryan/flink/tree/refactor-backend-test)
rescaling tests to add more snapshots for the same backend and then shuffle
them (so that metadata from one backend could overwrite metadata of another).
But I realized that it won't break recovery, because each snapshot (i.e.
`ChangelogStateBackendHandle`) contains metadata in the beginning; and reading
of each such snapshot is "atomic" (i.e. doesn't interlieave with reading other
snapshots).
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