curcur commented on a change in pull request #14943:
URL: https://github.com/apache/flink/pull/14943#discussion_r584022485
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/state/StateBackendLoader.java
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@@ -204,6 +222,11 @@ public static StateBackend
fromApplicationOrConfigOrDefault(
// (1) the application defined state backend has precedence
if (fromApplication != null) {
+
+ checkArgument(
+ !(fromApplication instanceof DelegateStateBackend),
+ "DelegateStateBackend can not be delegated!");
Review comment:
But does not ALL OF US agree that `ChangelogStateBackend` is only
configured through "flag"? That long discussion with Seth, Piotr, Arvid and
you??
Please check the COUPLE OF HILIGHTS of this PR
"ChangelogStateBackend is enabled through configuration key
"state.backend.enable-statechangelog". It is not directly exposed to users,
because ChangelogStateBackend is an implementation detail and users should NOT
be aware of it. In other words, application initialization is not supported:
evn.setStateBackend(new ChangelogStateBackend(...)) NOT SUPPORT"
And that's why I added the check
"""
if (config.get(CheckpointingOptions.ENABLE_STATE_CHANGE_LOG)) {
LOG.info(
"Delegate State Backend is used, and the root State
Backend is {}",
backend.getClass().getSimpleName());
"""
Even if it allows to configure through the app, I dont think deserialization
would be a problem, which is not now. That's why I ask where the concern comes
from.
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