private void updateBlobMap(PutRequest putRequest) throws IOException {
    StoredBlob blob = new StoredBlob(putRequest, clusterMap);
    blobs.put(blob.id, blob);
  }
Serialize contents of the PutRequest and update the blob map with the serialized content.
@param putRequest the PutRequest
@throws IOException if there was an error reading the contents of the given PutRequest.
ambry-router/src/test/java/com/github/ambry/router/MockServer.java