add zone is not compatible with default zone

[HarrisChu]

steps:

1. create space s0 (vid_type=int, replica_factor=3, partition_num=4)
2. host has some part.
3. use the host to add zone.

expect result:

1. as discussed offline, host should in default zone.
2. cannot add this host to other zones.

actual result:

1. add zone successfully.

(root@nebula) [s1]> show hosts
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| Host                                                                   | Port | Status   | Leader count | Leader distribution  | Partition distribution |
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "fpplsn-storaged-0.fpplsn-storaged-headless.default.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "fpplsn-storaged-1.fpplsn-storaged-headless.default.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "s0:1"                 |
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "fpplsn-storaged-2.fpplsn-storaged-headless.default.svc.cluster.local" | 9779 | "ONLINE" | 4            | "s1:4"               | "s0:2, s1:4"           |
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "fpplsn-storaged-3.fpplsn-storaged-headless.default.svc.cluster.local" | 9779 | "ONLINE" | 3            | "s0:3"               | "s0:3"                 |
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "fpplsn-storaged-4.fpplsn-storaged-headless.default.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "s0:3"                 |
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "fpplsn-storaged-5.fpplsn-storaged-headless.default.svc.cluster.local" | 9779 | "ONLINE" | 1            | "s0:1"               | "s0:2"                 |
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "fpplsn-storaged-6.fpplsn-storaged-headless.default.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "s0:1"                 |
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "Total"                                                                |      |          | 8            | "s0:4, s1:4"         | "s0:12, s1:4"          |
+------------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
Got 8 rows (time spent 827/1549 us)


(root@nebula) [s1]>  add zone z5 "fpplsn-storaged-5.fpplsn-storaged-headless.default.svc.cluster.local":9779
Execution succeeded (time spent 1023/1425 us)

Mon, 13 Sep 2021 07:59:38 UTC

(root@nebula) [s1]> show zones
+------+------------------------------------------------------------------------+------+
| Name | Host                                                                   | Port |
+------+------------------------------------------------------------------------+------+
| "z2" | "fpplsn-storaged-1.fpplsn-storaged-headless.default.svc.cluster.local" | 9779 |
+------+------------------------------------------------------------------------+------+
| "z5" | "fpplsn-storaged-5.fpplsn-storaged-headless.default.svc.cluster.local" | 9779 |
+------+------------------------------------------------------------------------+------+
Got 2 rows (time spent 846/2283 us)

Mon, 13 Sep 2021 08:13:30 UTC

[darionyaphet]

Firstly, not existed default zone.

default group is a logical concept and could add host into another zone.

it's seems not a bug

[HarrisChu]

3 storages in a cluster

1. create space on default group, storage A has partition P1
2. add zone z1 with storage A and add group g1
3. create another space on g1 group
4. storage A has partition P2

so P1 is not in any zone, and P2 in zone z1.

It may be confused for balance remove, remove host from zone.

[darionyaphet]

after talk offline this is not a bug