NicoK opened a new pull request #10437: [FLINK-15068][rocksdb] stop writing to RocksDB logs by default URL: https://github.com/apache/flink/pull/10437 ## What is the purpose of the change With Flink's default settings for RocksDB, it will write a `LOG` file (not the WAL, but pure logging statements) into the data folder. Besides periodic statistics, it will log compaction attempts, new memtable creations, flushes, etc. This file grows indefinitely and may fill the disk without this log being actually used anywhere (it will be deleted with the job anway). With this PR, we are effectively disabling the log by default. If anyone wants to retain it, it can be re-configured at will providing an own `OptionsFactory`. ## Brief change log - change the default RocksDB configuration for all `PredefinedOptions` so that they use log level `HEADER_LEVEL` - disable periodic statistics dumps to the `LOG` file - hotfix the description of the `DefaultConfigurableOptionsFactory` ## Verifying this change I ran a Flink cluster with these changes and the `LOG` file now only contains some headers and is then never written to again. Normal behaviour is otherwise covered by existing tests. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): **no** - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: **no** - The serializers: **no** - The runtime per-record code paths (performance sensitive): **no** - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: **no** - The S3 file system connector: **no** ## Documentation - Does this pull request introduce a new feature? **no** - If yes, how is the feature documented? **JavaDocs**
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