more validation when create space in a empty zone

[HarrisChu]

1. a group with 3 zones, z1,z2,z3, z1 has no hosts.
2. create a 3 replica space on the group

expect result:

1. could not create space.

actual:

1. create successfully.
2. partition peers are not correctly.

(root@nebula) [(none)]> add zone z1 "svkhpd-storaged-0.svkhpd-storaged-headless.default.svc.cluster.local":9779
Execution succeeded (time spent 941/1787 us)

Sat, 09 Oct 2021 05:32:50 UTC

(root@nebula) [(none)]> add zone z2 "svkhpd-storaged-1.svkhpd-storaged-headless.default.svc.cluster.local":9779
Execution succeeded (time spent 929/1725 us)

Sat, 09 Oct 2021 05:32:59 UTC

(root@nebula) [(none)]> add zone z3 "svkhpd-storaged-2.svkhpd-storaged-headless.default.svc.cluster.local":9779
Execution succeeded (time spent 858/1194 us)

Sat, 09 Oct 2021 05:33:03 UTC

(root@nebula) [(none)]> drop host "svkhpd-storaged-0.svkhpd-storaged-headless.default.svc.cluster.local":9779 from zone z1
Execution succeeded (time spent 823/1641 us)

Sat, 09 Oct 2021 05:33:18 UTC

(root@nebula) [(none)]> add group g1 z1,z2,z3
Execution succeeded (time spent 754/1634 us)

Sat, 09 Oct 2021 05:33:26 UTC

(root@nebula) [(none)]> create space s1 (vid_type=int, replica_factor=3, partition_num=4) on g1
Execution succeeded (time spent 997/1689 us)

Sat, 09 Oct 2021 05:33:39 UTC

(root@nebula) [s1]> show zones
+------+------------------------------------------------------------------------+------+
| Name | Host                                                                   | Port |
+------+------------------------------------------------------------------------+------+
| "z1" | ""                                                                     | 0    |
+------+------------------------------------------------------------------------+------+
| "z2" | "svkhpd-storaged-1.svkhpd-storaged-headless.default.svc.cluster.local" | 9779 |
+------+------------------------------------------------------------------------+------+
| "z3" | "svkhpd-storaged-2.svkhpd-storaged-headless.default.svc.cluster.local" | 9779 |
+------+------------------------------------------------------------------------+------+
Got 3 rows (time spent 791/1783 us)

(root@nebula) [s1]> show parts
+--------------+-----------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+-------+
| Partition ID | Leader                                                                      | Peers                                                                                                                                                  | Losts |
+--------------+-----------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+-------+
| 1            | "svkhpd-storaged-2.svkhpd-storaged-headless.default.svc.cluster.local:9779" | "svkhpd-storaged-2.svkhpd-storaged-headless.default.svc.cluster.local:9779, svkhpd-storaged-1.svkhpd-storaged-headless.default.svc.cluster.local:9779" | ""    |
+--------------+-----------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+-------+
| 2            | "svkhpd-storaged-2.svkhpd-storaged-headless.default.svc.cluster.local:9779" | "svkhpd-storaged-2.svkhpd-storaged-headless.default.svc.cluster.local:9779, svkhpd-storaged-1.svkhpd-storaged-headless.default.svc.cluster.local:9779" | ""    |
+--------------+-----------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+-------+
| 3            | "svkhpd-storaged-2.svkhpd-storaged-headless.default.svc.cluster.local:9779" | "svkhpd-storaged-2.svkhpd-storaged-headless.default.svc.cluster.local:9779, svkhpd-storaged-1.svkhpd-storaged-headless.default.svc.cluster.local:9779" | ""    |
+--------------+-----------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+-------+
| 4            | "svkhpd-storaged-1.svkhpd-storaged-headless.default.svc.cluster.local:9779" | "svkhpd-storaged-2.svkhpd-storaged-headless.default.svc.cluster.local:9779, svkhpd-storaged-1.svkhpd-storaged-headless.default.svc.cluster.local:9779" | ""    |
+--------------+-----------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+-------+

[darionyaphet]

#2967 this pr have fix it ?

[HarrisChu]

no, this issue is
peerhost is not empty, but don't meet replica

(root@nebula) [s2]> show hosts graph
+---------------------------------------------------------------+------+----------+---------+--------------+---------+
| Host                                                          | Port | Status   | Role    | Git Info Sha | Version |
+---------------------------------------------------------------+------+----------+---------+--------------+---------+
| "svkhpd-graphd-0.svkhpd-graphd-svc.default.svc.cluster.local" | 9669 | "ONLINE" | "GRAPH" | "e642c05"    |         |
+---------------------------------------------------------------+------+----------+---------+--------------+---------+

2.6.0 branch

[HarrisChu]

#3065