in hadoop-api-shim/src/main/java/org/apache/hadoop/fs/shim/impl/FileSystemShimImpl.java [215:223]
public void msync() throws IOException {
if (msyncFound()) {
try {
msyncMethod.invoke(getInstance());
} catch (IllegalArgumentException | UnsupportedOperationException e) {
LOG.debug("Failure of msync()", e);
}
}
}