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https://issues.apache.org/jira/browse/FLINK-8715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16457248#comment-16457248
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ASF GitHub Bot commented on FLINK-8715:
---------------------------------------
Github user bowenli86 commented on a diff in the pull request:
https://github.com/apache/flink/pull/5885#discussion_r184831125
--- Diff:
flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/AbstractRocksDBState.java
---
@@ -190,4 +197,12 @@ protected void writeKeyWithGroupAndNamespace(
RocksDBKeySerializationUtils.writeKey(key, keySerializer,
keySerializationStream, keySerializationDataOutputView, ambiguousKeyPossible);
RocksDBKeySerializationUtils.writeNameSpace(namespace,
namespaceSerializer, keySerializationStream, keySerializationDataOutputView,
ambiguousKeyPossible);
}
+
+ protected V getDefaultValue() {
--- End diff --
this method is duplicated among some impl classes. We can move it to
`InternalKvState` as a [default
method](https://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods.html).
> RocksDB does not propagate reconfiguration of serializer to the states
> ----------------------------------------------------------------------
>
> Key: FLINK-8715
> URL: https://issues.apache.org/jira/browse/FLINK-8715
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.3.2
> Reporter: Arvid Heise
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Blocker
> Fix For: 1.5.0
>
>
> Any changes to the serializer done in #ensureCompability are lost during the
> state creation.
> In particular,
> [https://github.com/apache/flink/blob/master/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBValueState.java#L68]
> always uses a fresh copy of the StateDescriptor.
> An easy fix is to pass the reconfigured serializer as an additional parameter
> in
> [https://github.com/apache/flink/blob/master/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeyedStateBackend.java#L1681]
> , which can be retrieved through the side-output of getColumnFamily
> {code:java}
> kvStateInformation.get(stateDesc.getName()).f1.getStateSerializer()
> {code}
> I encountered it in 1.3.2 but the code in the master seems unchanged (hence
> the pointer into master). I encountered it in ValueState, but I suspect the
> same issue can be observed for all kinds of RocksDB states.
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