@Override
    void postCompletionCleanup() {
      correlationIdToGetRequestInfo.clear();
    }
{@inheritDoc}
<br>
Post completion cleanup for the FirstGetChunk only involves clearing the correlation id map (so that
subsequent responses are ignored). The rest of the state of the FirstGetChunk is never cleared.
ambry-router/src/main/java/com/github/ambry/router/GetBlobOperation.java