How to handle large requests to getMassProperties

[candcconsulting]

I have started to get 504 errors on requests to getMassProperties (admittedly only on large iModels)
Let me know if you want some more stats
If you want access to the project where they fail ... I can provide access
The below code was how I was trying to handle the failures ...

private static getMassPropertiesWithRetry = async (iModelConnection: CheckpointConnection, ids: string[], unit: string, classId: string, category: string): Promise<number> => {
  let returnValue: number  = 0;
  let operation: MassPropertiesOperation;
  console.log(`Retrieving ${ids.length} candidates of class ${classId} and category ${category} via queue ...`)
  const iTwinId = iModelConnection.iTwinId;
  const iModelId = iModelConnection.iModelId;
  const changesetId = iModelConnection.changeset.id;
  let accessToken = "";
  if (IModelApp.authorizationClient) {
    accessToken = await IModelApp.authorizationClient.getAccessToken();
    if (!accessToken) {
        // Handle the case where the access token is undefined
        throw new Error("Failed to get access token");
    }
} else {
    // Handle the case where IModelApp.authorizationClient is undefined
    throw new Error("IModelApp.authorizationClient is undefined");
}

  switch (unit) {
      case "m3":
      case "kg":
          operation = MassPropertiesOperation.AccumulateVolumes;
          break;
      case "m2":
          operation = MassPropertiesOperation.AccumulateAreas;
          break;
      case "m":
          operation = MassPropertiesOperation.AccumulateLengths;
          break;
      default:
          throw new Error(`Invalid unit: ${unit}`);
  }

  try {
      // const massProperty = await BentleyAPIFunctions.getMassProperties(iTwinId,iModelId , changesetId , accessToken, ids,  operation );
      const massProperty = await iModelConnection.getMassProperties( {candidates : ids,  operation : operation} );
      if (massProperty.status === 0) {
          switch (unit) {
              case "m3":
              case "kg":
                  returnValue = massProperty.volume ? massProperty.volume : 0;
                  break;
              case "m2":
                  returnValue = massProperty.area ? massProperty.area : 0;
                  break;
              case "m":
                  returnValue = massProperty.length ? massProperty.length : 0;
                  break;
          }
      }
  } catch (error : any) {
      if (error.response && error.response.status === 504) {
          console.log(`Splitting ${ids.length} candidates of class ${classId} and category ${category} into two and retrying...`)
          // Split the candidates into two and retry
          const mid = Math.ceil(ids.length / 2);
          const ids1 = ids.slice(0, mid);
          const ids2 = ids.slice(mid);

          const returnValue1 = await this.getMassPropertiesWithRetry(iModelConnection, ids1, unit, classId, category);
          const returnValue2 = await this.getMassPropertiesWithRetry(iModelConnection, ids2, unit, classId, category);

          returnValue = returnValue1 + returnValue2;
      } else {
          throw error; // Re-throw the error if it's not a 504 error
      }
  }

  return returnValue;
}

However, the error seems to be handled inside the iModelConnection.getMassProperties
Is there a way to enable the error to be handled by this function ... or is this incorrect ?

This is the error
https://api.bentley.com/imodel/rpc/v4/mode/1/context/73fb46a3-b956-4376-bec0-564a1a7a59d7/imodel/021dbd63-00ba-407c-8729-791b1cecbbb6/changeset/4291338b4f69bd5d2ae6e4691a6f5548ae4d82db/IModelReadRpcInterface-3.6.0-getMassProperties
Request Method:
POST
Status Code:
504 Gateway Timeout
and the payload is attached

payload.txt

[aruniverse]

Please share x-correlation-id from a failing req

[candcconsulting]

Tx Aaron
I can post another on Monday ... in this session there were 22 failures ...
one of the x-correlation-ids
X-Correlation-Id:
9a795912-0bc4-4340-907f-d483d6d5ff73
X-Itwinplatform-Media-Type:
bentley.itwin-platform.v1
X-Itwinplatform-Region:
UK South
Ping me if you want a "fresher" one on Monday

[candcconsulting]

Hi @aruniverse here is a fresher correlation information
X-Correlation-Id:
7d71b596-0f54-44ea-bebf-4ecf026aaf21
X-Itwinplatform-Media-Type:
bentley.itwin-platform.v1
X-Itwinplatform-Region:
UK South