cache.iamUserGroupMemberships = newCache.iamUserGroupMemberships
		cache.iamUserPolicyMap = newCache.iamUserPolicyMap
		cache.iamUsersMap = newCache.iamUsersMap
		// For STS policy map, we need to merge the new cache with the existing
		// cache because the periodic IAM reload is partial. The periodic load
		// here is to account for STS policy mapping changes that should apply

    Comparator<TestDatum> comparator = Comparator.comparing(d -> d.letter);

    // When elements compare as equal (both C's have same letter), our merge should always return C1
    // before C2, since C1 is from the first iterator.

    Iterator<TestDatum> merged =
        Iterators.mergeSorted(ImmutableList.of(left.iterator(), right.iterator()), comparator);

## Changelog since v1.21.10

## Changes by Kind

### API Change

    - A new option cloudConfigType has been added to the cloud-config file. Supported values are: `file`, `secret` and `merge` (`merge` is the default value).
    - To allow Azure cloud provider to read secrets, the [RBAC rules](https://github.com/kubernetes/kubernetes/pull/78242) should be configured.

#### CLI

# Attempt to minimize the amount of data transfer between bazel and the remote
# workers:
common:rbe_base --remote_download_toplevel
test:rbe_base --test_env=USER=anon

# TODO(kanglan): Check if we want to merge rbe_linux into rbe_linux_cpu.
common:rbe_linux --config=rbe_base
common:rbe_linux --action_env=PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/go/bin"

* GCE provider: Limit Filter calls to regexps rather than large blobs ([#27741](https://github.com/kubernetes/kubernetes/pull/27741), [@zmerlynn](https://github.com/zmerlynn))
* Fix strategic merge diff list diff bug ([#26418](https://github.com/kubernetes/kubernetes/pull/26418), [@AdoHe](https://github.com/AdoHe))

	for i, stat := range lastDayStats {
		if errs[i] != nil {
			peersLogOnceIf(ctx, fmt.Errorf("failed to fetch last day tier stats: %w", errs[i]), sys.peerClients[i].host.String())
			continue
		}
		merged.merge(stat)
	}
	return merged
}

// GetReplicationMRF - Get replication MRF from all peers.

    checkNotNull(iterators, "iterators");
    checkNotNull(comparator, "comparator");

    return new MergingIterator<>(iterators, comparator);
  }

  /**
   * An iterator that performs a lazy N-way merge, calculating the next value each time the iterator
   * is polled. This amortizes the sorting cost over the iteration and requires less memory than
   * sorting all elements at once.
   *

  VerifyFDefOutputs(fdef, M({{"test_loop_exit"}}));
  VerifyFDefEdges(fdef,
                  {{"feed1", "test_loop/Enter:0"},
                   {"test_loop/Enter:output:0", "test_loop/Merge:0"},
                   {"test_loop/Merge:output:0", "test_loop/Switch:0"},
                   {"test_loop/Switch:output_false:0", "test_loop/Exit:0"},
                   {"test_loop/Exit:output:0", "test_loop_exit"}},

         * values[0] which means that the original value instead of the overridden one is returned
         * (first wins). With properties values are truely overriden since at the end a map is used
         * to merge which means last wins.
         *
         * TODO Report this behavioral bug with Commons CLI
         */
        // now add all options, except for user properties with CLI first then maven.config file