Mikhail Petrov created IGNITE-28933:
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Summary: Get rid of Tracing-related classes stored in PDS
Key: IGNITE-28933
URL: https://issues.apache.org/jira/browse/IGNITE-28933
Project: Ignite
Issue Type: Task
Reporter: Mikhail Petrov
After the Tracing internal implementation was removed in IGNITE-28910, the
following classes were marked for removal in the next Apache Ignite release:
* org.apache.ignite.spi.tracing.TracingConfigurationCoordinates
* org.apache.ignite.spi.tracing.TracingConfigurationParameters
However, these classes cannot be removed without considering PDS backward
compatibility. Instances of these classes were stored in the distributed
MetaStorage under the `"tr.config"` key. Since distributed MetaStorage values
may be persisted to the Persistent Data Store (PDS), removing these classes
could cause deserialization failures when MetaStorage entries are restored from
PDS during node join.
See -
org.apache.ignite.internal.processors.metastorage.persistence.DistributedMetaStorageImpl#validatePayload.
We need to investigate a mechanism for safely skipping deserialization of these
classes when restoring data from older PDS versions so that they can be removed
without breaking backward compatibility.
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