Yun Tang created FLINK-22369:
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Summary: RocksDB state backend might occur ClassNotFoundException
when deserializing on TM side
Key: FLINK-22369
URL: https://issues.apache.org/jira/browse/FLINK-22369
Project: Flink
Issue Type: Bug
Affects Versions: 1.13.0
Reporter: Yun Tang
Fix For: 1.13.0
Attachments: image-2021-04-20-15-18-49-706.png
FLINK-19467 introduced new {{EmbeddedRocksDBStateBackend}} and added new
interface
{{[EmbeddedRocksDBStateBackend#setLogger|https://github.com/apache/flink/blob/24031e55e4cf35a5818db2e927e65b290a9b2aed/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/EmbeddedRocksDBStateBackend.java#L287]}}
to ensures users of the legacy {{RocksDBStateBackend}} see consistent logging.
However, this change introduce another non transient
{{[logger|https://github.com/apache/flink/blob/24031e55e4cf35a5818db2e927e65b290a9b2aed/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/EmbeddedRocksDBStateBackend.java#L115]}}
and it would be deserialized on TM side first. If the client has different
log4j implementation, we might meet ClassNotFoundException:
!image-2021-04-20-15-18-49-706.png!
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