public <T> ExecutionResult<T> doExecute(KeyspaceOperationCallback<T> koc)
throws HectorException {
KeyspaceService ks = null;
try {
ks = new KeyspaceServiceImpl(keyspace, consistencyLevelPolicy,
connectionManager, failoverPolicy, credentials);
return koc.doInKeyspaceAndMeasure(ks);
} finally {
if (ks != null) {
// connectionManager.releaseClient(ks.getClient());