This is a continuation of the posts on Azure Data Platform and discusses the connections to be made for Azure Data Factory to reach on-premises data stores.
The networking solution to connect Azure Data Factory to
on-premises is the same as for any other Azure service to reach the on-premises
network. It includes private endpoint for incoming traffic, virtual network
integrations for outgoing traffic, gateways and on-premises connectivity. Every
virtual network can have its own gateway and this gateway can be used to
connect to the on-premises network. When virtual networks connect via their
gateways, the traffic between them flows through the peering configuration.
This traffic uses the Azure Backbone. A
virtual network can configure a gateway as a transit point to an on-premises network,
but it will not have its own gateway in this case because there can be only one
gateway either local or remote. Gateway transit is a peering property that lets
one virtual network use the VPN gateway in the peered virtual network for
cross-premises or VNet-to-VNet connectivity.
Gateway transit allows the peered virtual networks to use
the Azure VPN gateway in the hub. Connectivity available on the VPN gateway
includes Site-to-Site connection to the on-premises site, Point-to-Site
connection for VPN clients and VNet-to-VNet connections to other VNets. The VPN
gateway is placed in the hub virtual network and the virtual network gateway
must be in the resource manager deployment model, not the classic deployment
model. The resource manager and classic
deployment models are two different ways of deploying Azure solutions and
involve different API sets. The two models aren’t compatible with each other.
Virtual machines, storage accounts and virtual networks support both Resource
Manager and classic deployment models and all other services support resource
manager. Resources created by these two different methods do not behave the
same.
In the hub and spoke cloud virtual networks topology, the
gateway transit allows them to share the VPN gateway in the hub. Routes to the
gateway connected virtual network or to the on-premises will propagate to the
routing tables of all the peered networks. This default behavior must be
explicitly restricted in the VPN gateway by creating a table with the “Disable
BGP route propagation” option and the routing table to the subnets must be
associated with. The Network Contributor role that grants permission for Microsoft.Network/virtualNetworkPeerings/write
must be granted.
In the Azure portal view of the Hub RM virtual network, a
peering is added with the values specified in “This virtual network” section as
“Allow” for traffic to remote virtual network, “Allow” for traffic forwarded to
remote virtual network and with the option selected to “Use this virtual
network’s gateway or Route Server”. On the same page, the values for the “Remote
Virtual network” section must specify the deployment model as “Resource
Manager”, the virtual network to be the Spoke RM virtual network, the traffic
to remote virtual network to be allowed, the traffic forwarded from the remote
virtual network to be allowed. The virtual network gateway for this section
will specify to use the remote virtual network’s gateway which is the hub’s
gateway. When this peering is created, it’s status will appear as connected on
both virtual networks.
To confirm that the virtual networks are peered, we can
check the effective routes by spot checking the routes of a network interface
in any subnet in the virtual network. These subnets will have routes with next
hop type as VNet peering, for each address space in each peered virtual network.
#codingexercise
Problem Statement: A 0-indexed
integer array nums is given.
Swaps of adjacent elements are able to be performed on nums.
A valid array meets the
following conditions:
·
The largest element (any
of the largest elements if there are multiple) is at the rightmost position in
the array.
·
The smallest element (any
of the smallest elements if there are multiple) is at the leftmost position in
the array.
Return the minimum swaps
required to make nums a valid array.
Example 1:
Input: nums =
[3,4,5,5,3,1]
Output: 6
Explanation: Perform the
following swaps:
- Swap 1: Swap
the 3rd and 4th elements, nums is then [3,4,5,3,5,1].
- Swap 2: Swap
the 4th and 5th elements, nums is then [3,4,5,3,1,5].
- Swap 3: Swap
the 3rd and 4th elements, nums is then [3,4,5,1,3,5].
- Swap 4: Swap
the 2nd and 3rd elements, nums is then [3,4,1,5,3,5].
- Swap 5: Swap
the 1st and 2nd elements, nums is then [3,1,4,5,3,5].
- Swap 6: Swap
the 0th and 1st elements, nums is then [1,3,4,5,3,5].
It can be shown
that 6 swaps is the minimum swaps required to make a valid array.
Example 2:
Input: nums = [9]
Output: 0
Explanation: The array is
already valid, so we return 0.
Constraints:
·
1 <= nums.length <= 105
·
1 <= nums[i] <= 105
Solution:
class Solution {
public int minimumSwaps(int[] nums) {
int min = Arrays.stream(nums).min().getAsInt();
int max = Arrays.stream(nums).max().getAsInt();
int count = 0;
while
(nums[0] !=
min && nums[nums.length-1] !=
max && count < 2 * nums.length)
{
var numsList = Arrays.stream(nums).boxed().collect(Collectors.toList());
var end = numsList.lastIndexOf(max);
for (int i =
end; i < nums.length-1; i++)
{
swap(nums, i, i+1);
count++;
}
numsList = Arrays.stream(nums).boxed().collect(Collectors.toList());
var start = numsList.indexOf(min);
for (int j =
start; j >= 1; j--) {
swap(nums, j, j-1);
count++;
}
}
return
count;
}
public void swap (int[] nums, int i, int j) {
int temp =
nums[j];
nums[j] = nums[i];
nums[i] = temp;
}
}
Input
nums =
[3,4,5,5,3,1]
Output
6
Expected
6
Input
nums =
[9]
Output
0
Expected
0
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