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https://issues.apache.org/jira/browse/FLINK-9808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai closed FLINK-9808.
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Resolution: Fixed
Merged for 1.7.0: 70f4141369850dcc16efe3ddfe71618ea8cda304
> Implement state conversion procedure in state backends
> ------------------------------------------------------
>
> Key: FLINK-9808
> URL: https://issues.apache.org/jira/browse/FLINK-9808
> Project: Flink
> Issue Type: Sub-task
> Components: State Backends, Checkpointing
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Aljoscha Krettek
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.7.0
>
>
> With FLINK-9377 in place and that config snapshots serve as the single source
> of truth for recreating restore serializers, the next step would be to
> utilize this when performing a full-pass state conversion (i.e., read with
> old / restore serializer, write with new serializer).
> For Flink's heap-based backends, it can be seen that state conversion
> inherently happens, since all state is always deserialized after restore with
> the restore serializer, and written with the new serializer on snapshots.
> For the RocksDB state backend, since state is lazily deserialized, state
> conversion needs to happen for per-registered state on their first access if
> the registered new serializer has a different serialization schema than the
> previous serializer.
> This task should consist of three parts:
> 1. Allow {{CompatibilityResult}} to correctly distinguish between whether the
> new serializer's schema is a) compatible with the serializer as it is, b)
> compatible after the serializer has been reconfigured, or c) incompatible.
> 2. Introduce state conversion procedures in the RocksDB state backend. This
> should occur on the first state access.
> 3. Make sure that all other backends no longer do redundant serializer
> compatibility checks. That is not required because those backends always
> perform full-pass state conversions.
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