Misc extensions of the Document/Field API.
Misc index tools and index support.
Miscellaneous index tools.
Misc search implementations.
Misc Directory implementations.
Support for creating docvalues on-the-fly from the inverted index at runtime.
Misc FST classes.
NOTE: This uses C++ sources (accessible via JNI), which you'll have to compile on your platform.
NativeUnixDirectory is a Directory implementation that bypasses the
OS's buffer cache (using direct IO) for any IndexInput and IndexOutput
used during merging of segments larger than a specified size (default
10 MB). This avoids evicting hot pages that are still in-use for
searching, keeping search more responsive while large merges run.
See this blog post for details. Steps to build:
NativePosixUtil.cpp/java also expose access to the posix_madvise, madvise, posix_fadvise functions, which are somewhat more cross platform than O_DIRECT, however, in testing (see above link), these APIs did not seem to help prevent buffer cache eviction.
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