private void checkInitialized() throws StoreException {
    if (!initialized) {
      throw new StoreException("Store not initialized", StoreErrorCodes.StoreNotInitialized);
    }
  }
Resumes a compaction if one is in progress.
@throws StoreException if there are any errors during the compaction.
@param bundleReadBuffer the preAllocated buffer for bundle read in compaction copy phase.
ambry-store/src/main/java/com/github/ambry/store/BlobStore.java