@Override
  public Iterable<Service> getServices() {
    return Collections.singleton(this);
  }
Test coprocessor endpoint that always throws a {@link DoNotRetryIOException} for requests on the
last region in the table. This allows tests to ensure correct error handling of coprocessor
endpoints throwing exceptions.
hbase-endpoint/src/test/java/org/apache/hadoop/hbase/coprocessor/ColumnAggregationEndpointWithErrors.java