[DocDB] <node-ip>:7000/api/v1/tablet-under-replication does not display correct underreplicated tablets for per-table configs

[charleswang234]

Jira Link: DB-6462

Description

<node-ip>:7000/api/v1/tablet-under-replication uses global replication factor and does not account for per-table configurations

Steps to reproduce:

Create a 6 node rf3 universe, with 2 nodes in each of the following azs:

1. us-west1-a
2. us-west1-b
3. us-west1-c

Create a tablespace (rf5) with custom placement info:

CREATE TABLESPACE us_west_1_zone_tablespace
  WITH (replica_placement='{"num_replicas": 5, "placement_blocks": [
    {"cloud":"gcp","region":"us-west1","zone":"us-west1-a","min_num_replicas":2},
    {"cloud":"gcp","region":"us-west1","zone":"us-west1-b","min_num_replicas":2},
    {"cloud":"gcp","region":"us-west1","zone":"us-west1-c","min_num_replicas":1}
    ]}');

    CREATE TABLE single_zone_table (id INTEGER, field text)
  TABLESPACE us_west_1_zone_tablespace SPLIT INTO 1 TABLETS;

Take down a node containing this tablet.

In the <node-ip>:7000/api/v1/tablet-under-replication page, we will not see this tablet-id.

Ex: Tablet Id: b20ca82765444851b1fad9e0489a9bfb

<node-ip>:7000/api/v1/tablet-under-replication response:

{"underreplicated_tablets":[{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"ef882b3815944571aa04f2631c182dba"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"cfbaeb1c587846b99dc20e80ca59c94b"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"bdf44de1c97749a789cac333c12c4947"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"a80c295ecf284722aa6a406a28ddcc1a"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"ba5ea01a3a0b48bc9d4b2b8cfa4add90"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"4ebcee4181414f6494857cd2858133d3"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"02674a4a36c54a7bb638722e9ccd6138"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"3f37f73058fb43298adf8204ca690f88"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"320682d439ec430aa27a907228e96255"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"1fd74eed4f1743ef9ca7f1ca637cae7d"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"17456a32b3c243ec92c07199005cdf93"},{"table_uuid":"3565191977cc47b38d10bfb60906091f","tablet_uuid":"1c3e81b3b8064d6dbef4885766b2fd17"},{"table_uuid":"000033f2000030008000000000004000","tablet_uuid":"c6f026bba36545d2b175f29b657dd8f8"},{"table_uuid":"000033f2000030008000000000004000","tablet_uuid":"03554a0168cf4d229f55bcad0373fdd8"},{"table_uuid":"000033f2000030008000000000004000","tablet_uuid":"34cd53a336ff4360ae12bf01e51cd585"},{"table_uuid":"000033f2000030008000000000004000","tablet_uuid":"217d40e55df044afb7a2b893c4497f1f"}]}

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