![]() With JNA, Cassandra uses the link call directly. Java Native Interface (JNI) is a standard programming interface for writing Java native methods and embedding the Java virtual machine into native applications. On nodes with thousands of SSTables, this would take a very long time, because it had to fork+exec the JVM to run the new process. Previously Cassandra would use the /bin/ln binary to create hard links to SSTables when creating a snapshot. Since 0.6.6: JNA for hard links, improving snapshots.Chris Goffinet reported a 13% performance improvement in his tests from this change. This prevents Linux from swapping out parts of the JVM that aren’t accessed frequently. Specific features enabled by JNA in Cassandra: Java native access code#JNA lets Cassandra access functions that otherwise wouldn’t be available in a pure JVM API. JNA provides Java programs easy access to native shared libraries (DLLs on Windows) without writing anything but Java code no JNI or native code is required. Since Apache Cassandra is written in Java, it doesn’t have access to many operating system level optimizations, that are helpful when you are building essentially an on disk data storage system. So, it lets Java easily call functions in a C library, without using JNI or other generated code, just like Python’s CTypes. Access is dynamic at runtime without code generation This functionality is comparable to Windows’ Platform/Invoke and Python’s ctypes. ![]() ![]() JNA provides Java programs easy access to native shared libraries (DLLs on Windows) without writing anything but Java code-no JNI or native code is required. Version of JNA and related jars: 5.8.0 Version and vendor of the java virtual machine: JDK 11 & 17 provided by Microsoft for WoA Operating system: Windows 11 on Arm64 System architecture (CPU type, bitness of the JVM): Arm64, 64-bit JVM. Java Native Access (JNA) The definitive JNA reference (including an overview and usage details) is in the JavaDoc.Please read the overview.Questions, comments, or exploratory conversations should begin on the mailing list, although you may find it easier to find answers to already-solved problems on StackOverflow. ![]() Java Native Access is a library to provide access to native function calls on top of the JVM - from its website: ![]()
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