{"record":{"id":"20afe48b474c3fb3","repo":"apache/cassandra","slug":"unable-to-open-hint-directory-using-native-library","errorCode":null,"errorMessage":"Unable to open hint directory using Native library. Skipping sync.","messagePattern":"Unable to open hint directory using Native library\\. Skipping sync\\.","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"src/java/org/apache/cassandra/hints/HintsCatalog.java","lineNumber":188,"sourceCode":"        {\n            try\n            {\n                SyncUtil.trySync(fd);\n                NativeLibrary.tryCloseFD(fd);\n            }\n            catch (FSError e) // trySync failed\n            {\n                logger.error(\"Unable to sync directory {}\", hintsDirectory.absolutePath(), e);\n                FileUtils.handleFSErrorAndPropagate(e);\n            }\n        }\n        else if (!NativeLibrary.isEnabled())\n        {\n            return;\n        }\n        else if (DatabaseDescriptor.isClientInitialized())\n        {\n            logger.warn(\"Unable to open hint directory using Native library. Skipping sync.\");\n        }\n        else\n        {\n            if (SyncUtil.SKIP_SYNC)\n                return;\n            logger.error(\"Unable to open directory {}\", hintsDirectory.absolutePath());\n            FileUtils.handleFSErrorAndPropagate(new FSWriteError(new IOException(String.format(\"Unable to open hint directory %s\", hintsDirectory.absolutePath())), hintsDirectory.absolutePath()));\n        }\n    }\n\n    ImmutableMap<String, Object> getWriterParams()\n    {\n        return writerParams;\n    }\n}\n","sourceCodeStart":170,"sourceCodeEnd":204,"githubUrl":"https://github.com/apache/cassandra/blob/88fd0f6a0eaed8943f05ac9e8f947882b8ddc8f1/src/java/org/apache/cassandra/hints/HintsCatalog.java#L170-L204","documentation":"HintsCatalog.fsyncDirectory tries to fsync the hints directory using the native library (JNA) to open a directory file descriptor. If the native library is enabled but the code runs in a client (dtest/tooling) context where DatabaseDescriptor client initialization is used, the native open is unavailable, so it logs this warning and skips the directory sync. Durability of the directory entry update is not guaranteed in that path.","triggerScenarios":"fsyncDirectory called with NativeLibrary.isEnabled() true but DatabaseDescriptor.isClientInitialized() true — i.e. client mode (dtests, tools) where the server-side native directory open cannot be used.","commonSituations":"Running in-JVM distributed tests or offline tools that touch HintsCatalog; container images missing the JNA native bindings for server startup.","solutions":["Ignore in test/client contexts — the sync skip is expected there","In production server startup, verify JNA is available (libjna on the classpath / nativelib extraction) so the real fsync path is used","Check that no 'cassandra.client' style initialization is accidentally used for a server process"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"// caller-side: skip sync expectations in client mode\nboolean canNativeSync = NativeLibrary.isEnabled() && !DatabaseDescriptor.isClientInitialized();","typeGuard":null,"tryCatchPattern":null,"preventionTips":["In production, ensure JNA and native libs are available so directory fsync works","Treat the warning as expected in dtests/tools","Verify hints directory durability requirements for your deployment"],"tags":["hints","fsync","native","durability"],"backgroundTag":"feature-not-enabled","analyzedSha":"88fd0f6a0eaed8943f05ac9e8f947882b8ddc8f1","analyzedAt":"2026-09-10T07:29:22.284Z","contentChangedAt":"2026-09-10T07:29:22.284Z","schemaVersion":2},"datasetVersion":"2026-09-17T15:17:12.973Z"}