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articles/hdinsight/hdinsight-administer-use-dotnet-sdk.md

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@@ -5,7 +5,7 @@ description: Learn how to perform administrative tasks for the Apache Hadoop clu
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ms.service: hdinsight
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ms.custom: "hdinsightactive, devx-track-csharp"
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ms.topic: conceptual
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ms.date: 06/30/2022
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ms.date: 11/17/2022
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>balancer
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```
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* Apache Storm
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You can seamlessly add or remove data nodes to your Storm cluster while it is running. But after a successful completion of the scaling operation, you will need to rebalance the topology.
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Rebalancing can be accomplished in two ways:
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* Storm web UI
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* Command-line interface (CLI) tool
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Please refer to the [Apache Storm documentation](https://storm.apache.org/documentation/Understanding-the-parallelism-of-a-Storm-topology.html) for more details.
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The Storm web UI is available on the HDInsight cluster:
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:::image type="content" source="./media/hdinsight-administer-use-powershell/hdinsight-portal-scale-cluster-storm-rebalance.png" alt-text="HDInsight Storm scale rebalance":::
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Here is an example how to use the CLI command to rebalance the Storm topology:
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```console
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## Reconfigure the topology "mytopology" to use 5 worker processes,
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## the spout "blue-spout" to use 3 executors, and
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## the bolt "yellow-bolt" to use 10 executors
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$ storm rebalance mytopology -n 5 -e blue-spout=3 -e yellow-bolt=10
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```
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The following code snippet shows how to resize a cluster synchronously or asynchronously:
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```csharp
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_hdiManagementClient.Clusters.Resize("<Resource Group Name>", "<Cluster Name>", <New Size>);
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_hdiManagementClient.Clusters.ResizeAsync("<Resource Group Name>", "<Cluster Name>", <New Size>);
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```
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## Grant/revoke access
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HDInsight clusters have the following HTTP web services (all of these services have RESTful endpoints):
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* ODBC
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* JDBC
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* Apache Ambari
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* Apache Oozie
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* Apache Templeton
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By default, these services are granted for access. You can revoke/grant the access. To revoke:
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```csharp
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var httpParams = new HttpSettingsParameters
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{
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HttpUserEnabled = false,
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HttpUsername = "admin",
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HttpPassword = "*******",
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};
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_hdiManagementClient.Clusters.ConfigureHttpSettings("<Resource Group Name>, <Cluster Name>, httpParams);
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```
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To grant:
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```csharp
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var httpParams = new HttpSettingsParameters
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{
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HttpUserEnabled = enable,
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HttpUsername = "admin",
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HttpPassword = "*******",
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};
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_hdiManagementClient.Clusters.ConfigureHttpSettings("<Resource Group Name>, <Cluster Name>, httpParams);
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```
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> [!NOTE]
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> By granting/revoking the access, you will reset the cluster user name and password.
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This can also be done via the Portal. See [Manage Apache Hadoop clusters in HDInsight by using the Azure portal](hdinsight-administer-use-portal-linux.md).
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## Update HTTP user credentials
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It is the same procedure as Grant/revoke HTTP access. If the cluster has been granted the HTTP access, you must first revoke it. And then grant the access with new HTTP user credentials.

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