in hadoop-api-shim/src/main/java/org/apache/hadoop/fs/shim/impl/FileSystemShimImpl.java [226:238]
public boolean isImplemented(final String capability) {
// keep new entries in alphanumeric order.
switch (capability.toLowerCase(Locale.ROOT)) {
case MSYNC:
return msyncFound();
case OPENFILE:
return openFileFound();
case PATH_CAPABILITIES:
return pathCapabilitiesFound();
default:
return false;
}
}