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enable preload if default FSDirectory is resolved as MMapDirectory #814

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Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,25 @@ public static DirectoryFactory get(final String dirImpl) {
return new DirectoryFactory() {
@Override
public Directory open(Path path, IndexPreloadConfig preloadConfig) throws IOException {
return FSDirectory.open(path);
Directory directory = FSDirectory.open(path);
if (directory instanceof MMapDirectory){
MMapDirectory mMapDirectory = (MMapDirectory) directory;
// no preloading
if (!preloadConfig.getShouldPreload()) {
return mMapDirectory;
}

// all preloading
if (preloadConfig.getPreloadAll()) {
mMapDirectory.setPreload(true);
return mMapDirectory;
}

// some preloading
mMapDirectory.setPreload(true);
return new SplitMMapDirectory(FSLockFactory.getDefault(), mMapDirectory, preloadConfig.getExtensions());
}
return directory;
}
};
} else if (dirImpl.equals("MMapDirectory")) {
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