public void addMvccToOperationContext(long group, long nonce, long mvcc) {
    if (nonce == HConstants.NO_NONCE) {
      return;
    }
    NonceKey nk = new NonceKey(group, nonce);
    OperationContext result = nonces.get(nk);
    assert result != null;
    synchronized (result) {
      result.setMvcc(mvcc);
    }
  }
Store the write point in OperationContext when the operation succeed.
@param group Nonce group.
@param nonce Nonce.
@param mvcc  Write point of the succeed operation.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ServerNonceManager.java