public synchronized StorageDescriptor getSdFromCache(byte[] sdHash) {
    StorageDescriptorWrapper sdWrapper = sdCache.get(new ByteArrayWrapper(sdHash));
    return sdWrapper.getSd();
  }
Replaces the old db object with the new one. This will add the new database to cache if it does
not exist.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/cache/SharedCache.java