walterddr commented on code in PR #8828:
URL: https://github.com/apache/pinot/pull/8828#discussion_r1359063941


##########
pinot-controller/src/main/java/org/apache/pinot/controller/api/resources/PinotSegmentRestletResource.java:
##########
@@ -577,6 +599,107 @@ public SuccessResponse reloadSegmentDeprecated2(
     return reloadSegmentDeprecated1(tableName, segmentName, tableTypeStr);
   }
 
+  @GET
+  @Path("segments/segmentReloadStatus/{jobId}")
+  @Produces(MediaType.APPLICATION_JSON)
+  @ApiOperation(value = "Get status for a submitted reload operation",
+      notes = "Get status for a submitted reload operation")
+  public ServerReloadControllerJobStatusResponse getReloadJobStatus(
+      @ApiParam(value = "Reload job id", required = true) @PathParam("jobId") 
String reloadJobId)
+      throws Exception {
+    Map<String, String> controllerJobZKMetadata = 
_pinotHelixResourceManager.getControllerJobZKMetadata(reloadJobId);
+    if (controllerJobZKMetadata == null) {
+      throw new ControllerApplicationException(LOGGER, "Failed to find 
controller job id: " + reloadJobId,
+          Status.NOT_FOUND);
+    }
+
+    String tableNameWithType =
+        
controllerJobZKMetadata.get(CommonConstants.ControllerJob.TABLE_NAME_WITH_TYPE);
+    Map<String, List<String>> serverToSegments;
+
+    String singleSegmentName = null;
+    if (controllerJobZKMetadata.get(CommonConstants.ControllerJob.JOB_TYPE)
+        .equals(ControllerJobType.RELOAD_SEGMENT.toString())) {
+      // No need to query servers where this segment is not supposed to be 
hosted
+      singleSegmentName = 
controllerJobZKMetadata.get(CommonConstants.ControllerJob.SEGMENT_RELOAD_JOB_SEGMENT_NAME);
+      serverToSegments = new HashMap<>();
+      List<String> segmentList = Arrays.asList(singleSegmentName);
+      _pinotHelixResourceManager.getServers(tableNameWithType, 
singleSegmentName).forEach(server -> {
+        serverToSegments.put(server, segmentList);
+      });
+    } else {
+      serverToSegments = 
_pinotHelixResourceManager.getServerToSegmentsMap(tableNameWithType);
+    }
+
+    BiMap<String, String> serverEndPoints =
+        
_pinotHelixResourceManager.getDataInstanceAdminEndpoints(serverToSegments.keySet());
+    CompletionServiceHelper completionServiceHelper =
+        new CompletionServiceHelper(_executor, _connectionManager, 
serverEndPoints);
+
+    List<String> serverUrls = new ArrayList<>();
+    BiMap<String, String> endpointsToServers = serverEndPoints.inverse();
+    for (String endpoint : endpointsToServers.keySet()) {
+      String reloadTaskStatusEndpoint =
+          endpoint + "/controllerJob/reloadStatus/" + tableNameWithType + 
"?reloadJobTimestamp="
+              + 
controllerJobZKMetadata.get(CommonConstants.ControllerJob.SUBMISSION_TIME_MS);
+      if (singleSegmentName != null) {
+        reloadTaskStatusEndpoint = reloadTaskStatusEndpoint + "&segmentName=" 
+ singleSegmentName;
+      }
+      serverUrls.add(reloadTaskStatusEndpoint);
+    }
+
+    CompletionServiceHelper.CompletionServiceResponse serviceResponse =
+        completionServiceHelper.doMultiGetRequest(serverUrls, null, true, 
10000);
+
+    ServerReloadControllerJobStatusResponse 
serverReloadControllerJobStatusResponse =
+        new ServerReloadControllerJobStatusResponse();
+    serverReloadControllerJobStatusResponse.setSuccessCount(0);
+
+    int totalSegments = 0;
+    for (Map.Entry<String, List<String>> entry: serverToSegments.entrySet()) {
+      totalSegments += entry.getValue().size();
+    }
+    
serverReloadControllerJobStatusResponse.setTotalSegmentCount(totalSegments);
+    
serverReloadControllerJobStatusResponse.setTotalServersQueried(serverUrls.size());
+    
serverReloadControllerJobStatusResponse.setTotalServerCallsFailed(serviceResponse._failedResponseCount);
+
+    for (Map.Entry<String, String> streamResponse : 
serviceResponse._httpResponses.entrySet()) {
+      String responseString = streamResponse.getValue();
+      try {
+        ServerReloadControllerJobStatusResponse response =
+            JsonUtils.stringToObject(responseString, 
ServerReloadControllerJobStatusResponse.class);

Review Comment:
   why are we using `ServerReloadControllerJobStatusResponse.class` in JsonUtil 
instead of `SegmentReloadStatusValue.class` ? does it guarantee to be always 
compatible? this seems like a risky assumption consider controller and server 
are upgraded separately during rolling upgrade



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