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Summary: ## Overview In this PR, we introduce support for setting the RocksDB native logger through Java. As mentioned in the discussion on the [Google Group discussion](https://groups.google.com/g/rocksdb/c/xYmbEs4sqRM/m/e73E4whJAQAJ), this work is primarily motivated by the JDK 17 [performance regression in JNI thread attach/detach calls](https://bugs.openjdk.org/browse/JDK-8314859): the only existing RocksJava logging configuration call, `setLogger`, invokes the provided logger over the JNI. ## Changes Specifically, these changes add support for the `devnull` and `stderr` native loggers. For the `stderr` logger, we add the ability to prefix every log with a `logPrefix`, so that it becomes possible know which database a particular log is coming from (if multiple databases are in use). The API looks like the following: ```java Options opts = new Options(); NativeLogger stderrNativeLogger = NativeLogger.newStderrLogger( InfoLogLevel.DEBUG_LEVEL, "[my prefix here]"); options.setLogger(stderrNativeLogger); try (final RocksDB db = RocksDB.open(options, ...)) {...} // Cleanup stderrNativeLogger.close() opts.close(); ``` Note that the API to set the logger is the same, via `Options::setLogger` (or `DBOptions::setLogger`). However, it will set the RocksDB logger to be native when the provided logger is an instance of `NativeLogger`. ## Testing Two tests have been added in `NativeLoggerTest.java`. The first test creates both the `devnull` and `stderr` loggers, and sets them on the associated `Options`. However, to avoid polluting the testing output with logs from `stderr`, only the `devnull` logger is actually used in the test. The second test does the same logic, but for `DBOptions`. It is possible to manually verify the `stderr` logger by modifying the tests slightly, and observing that the console indeed gets cluttered with logs from `stderr`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12213 Reviewed By: cbi42 Differential Revision: D52772306 Pulled By: ajkr fbshipit-source-id: 4026895f78f9cc250daf6bfa57427957e2d8b053 |
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| .. | ||
| benchmark/src/main/java/org/rocksdb/benchmark | ||
| crossbuild | ||
| jmh | ||
| rocksjni | ||
| samples/src/main/java | ||
| src | ||
| CMakeLists.txt | ||
| GetPutBenchmarks.md | ||
| HISTORY-JAVA.md | ||
| jdb_bench.sh | ||
| Makefile | ||
| pmd-rules.xml | ||
| pom.xml.template | ||
| RELEASE.md | ||
| spotbugs-exclude.xml | ||
| understanding_options.md | ||