devabhishekpal commented on code in PR #9033:
URL: https://github.com/apache/ozone/pull/9033#discussion_r2349556211


##########
hadoop-ozone/recon/src/main/resources/webapps/recon/ozone-recon-web/src/v2/pages/overview/overview.tsx:
##########
@@ -16,31 +16,55 @@
  * limitations under the License.
  */
 
-import React, { useEffect, useRef, useState } from 'react';
-import moment from 'moment';
-import filesize from 'filesize';
-import axios from 'axios';
+import React, { useState, useRef, useEffect } from 'react';
 import { Row, Col, Button } from 'antd';
-import {
-  CheckCircleFilled,
-  WarningFilled
-} from '@ant-design/icons';
 import { Link } from 'react-router-dom';
+import moment from 'moment';
 
-import AutoReloadPanel from '@/components/autoReloadPanel/autoReloadPanel';
+import OverviewSimpleCard from 
'@/v2/components/overviewCard/overviewSimpleCard';
 import OverviewSummaryCard from 
'@/v2/components/overviewCard/overviewSummaryCard';
 import OverviewStorageCard from 
'@/v2/components/overviewCard/overviewStorageCard';
-import OverviewSimpleCard from 
'@/v2/components/overviewCard/overviewSimpleCard';
-
-import { AutoReloadHelper } from '@/utils/autoReloadHelper';
-import { checkResponseError, showDataFetchError } from '@/utils/common';
-import { AxiosGetHelper, cancelRequests, PromiseAllSettledGetHelper } from 
'@/utils/axiosRequestHelper';
-
-import { ClusterStateResponse, OverviewState, StorageReport } from 
'@/v2/types/overview.types';
-
+import { AxiosGetHelper } from '@/utils/axiosRequestHelper';
+import { showDataFetchError } from '@/utils/common';
+import { cancelRequests } from '@/utils/axiosRequestHelper';
+import { useApiData } from '@/v2/hooks/useAPIData.hook';
+import { useAutoReload } from '@/v2/hooks/useAutoReload.hook';
+import AutoReloadPanel from '@/components/autoReloadPanel/autoReloadPanel';
+import { ClusterStateResponse, KeysSummary, OverviewState, TaskStatus } from 
'@/v2/types/overview.types';
 import './overview.less';
+import filesize from 'filesize';
+import { CheckCircleFilled, WarningFilled } from '@ant-design/icons';
 
+const DEFAULT_CLUSTER_STATE: ClusterStateResponse = {

Review Comment:
   Addressed in the latest commit



##########
hadoop-ozone/recon/src/main/resources/webapps/recon/ozone-recon-web/src/v2/pages/overview/overview.tsx:
##########
@@ -16,31 +16,55 @@
  * limitations under the License.
  */
 
-import React, { useEffect, useRef, useState } from 'react';
-import moment from 'moment';
-import filesize from 'filesize';
-import axios from 'axios';
+import React, { useState, useRef, useEffect } from 'react';
 import { Row, Col, Button } from 'antd';
-import {
-  CheckCircleFilled,
-  WarningFilled
-} from '@ant-design/icons';
 import { Link } from 'react-router-dom';
+import moment from 'moment';
 
-import AutoReloadPanel from '@/components/autoReloadPanel/autoReloadPanel';
+import OverviewSimpleCard from 
'@/v2/components/overviewCard/overviewSimpleCard';
 import OverviewSummaryCard from 
'@/v2/components/overviewCard/overviewSummaryCard';
 import OverviewStorageCard from 
'@/v2/components/overviewCard/overviewStorageCard';
-import OverviewSimpleCard from 
'@/v2/components/overviewCard/overviewSimpleCard';
-
-import { AutoReloadHelper } from '@/utils/autoReloadHelper';
-import { checkResponseError, showDataFetchError } from '@/utils/common';
-import { AxiosGetHelper, cancelRequests, PromiseAllSettledGetHelper } from 
'@/utils/axiosRequestHelper';
-
-import { ClusterStateResponse, OverviewState, StorageReport } from 
'@/v2/types/overview.types';
-
+import { AxiosGetHelper } from '@/utils/axiosRequestHelper';
+import { showDataFetchError } from '@/utils/common';
+import { cancelRequests } from '@/utils/axiosRequestHelper';
+import { useApiData } from '@/v2/hooks/useAPIData.hook';
+import { useAutoReload } from '@/v2/hooks/useAutoReload.hook';
+import AutoReloadPanel from '@/components/autoReloadPanel/autoReloadPanel';
+import { ClusterStateResponse, KeysSummary, OverviewState, TaskStatus } from 
'@/v2/types/overview.types';
 import './overview.less';
+import filesize from 'filesize';
+import { CheckCircleFilled, WarningFilled } from '@ant-design/icons';
 
+const DEFAULT_CLUSTER_STATE: ClusterStateResponse = {
+  missingContainers: 0,
+  totalDatanodes: 0,
+  healthyDatanodes: 0,
+  pipelines: 0,
+  storageReport: { capacity: 0, used: 0, remaining: 0, committed: 0 },
+  containers: 0,
+  volumes: 0,
+  buckets: 0,
+  keys: 0,
+  openContainers: 0,
+  deletedContainers: 0,
+  keysPendingDeletion: 0,
+  scmServiceId: 'N/A',
+  omServiceId: 'N/A'
+};
 
+const DEFAULT_TASK_STATUS: TaskStatus[] = [];
+const DEFAULT_OPEN_KEYS_SUMMARY: KeysSummary & {totalOpenKeys: number} = {
+  totalUnreplicatedDataSize: 0,
+  totalReplicatedDataSize: 0,
+  totalOpenKeys: 0
+};
+const DEFAULT_DELETE_PENDING_KEYS_SUMMARY: KeysSummary & {totalDeletedKeys: 
number} = {

Review Comment:
   Addressed in the latest commit



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