[Databricks][DatabricksJDBCDriver](500593) Communication link failure. Failed to connect to server.

violar — Wed, 06 Mar 2024 07:11:05 GMT

I am using databricks jdbc driver to run a certain app. It runs fine for a few mins to hours and then I get the error
[Databricks][DatabricksJDBCDriver](500593) Communication link failure. Failed to connect to server. Reason: HTTP Response code: 502, Error message: Unknown. Any suggestions to resolve this issue?

Here is the stack trace

```
java.sql.SQLException: [Databricks][DatabricksJDBCDriver](500593) Communication link failure. Failed to connect to server. Reason: HTTP Response code: 502, Error message: Unknown.
at com.databricks.client.hivecommon.api.HS2Client.handleTTransportException(Unknown Source)
at com.databricks.client.spark.jdbc.DowloadableFetchClient.handleTTransportException(Unknown Source)
at com.databricks.client.hivecommon.api.HS2Client.openSession(Unknown Source)
at com.databricks.client.hivecommon.api.HS2Client.<init>(Unknown Source)
at com.databricks.client.spark.jdbc.DowloadableFetchClient.<init>(Unknown Source)
at com.databricks.client.spark.jdbc.DownloadableFetchClientFactory.createClient(Unknown Source)
at com.databricks.client.hivecommon.core.HiveJDBCCommonConnection.connectToServer(Unknown Source)
at com.databricks.client.spark.core.SparkJDBCConnection.connectToServer(Unknown Source)
at com.databricks.client.hivecommon.core.HiveJDBCCommonConnection.establishConnection(Unknown Source)
at com.databricks.client.spark.core.SparkJDBCConnection.establishConnection(Unknown Source)
at com.databricks.client.jdbc.core.LoginTimeoutConnection.connect(Unknown Source)
at com.databricks.client.jdbc.common.BaseConnectionFactory.doConnect(Unknown Source)
at com.databricks.client.jdbc.common.AbstractDriver.connect(Unknown Source)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at world.data.external.jdbc.sandbox.ContextClassLoaderProxy.invoke(ContextClassLoaderProxy.java:82)
at jdk.proxy3/jdk.proxy3.$Proxy15.connect(Unknown Source)
Caused by: com.databricks.client.support.exceptions.ErrorException: [Databricks][DatabricksJDBCDriver](500593) Communication link failure. Failed to connect to server. Reason: HTTP Response code: 502, Error message: Unknown.
... 58 common frames omitted
Caused by: com.databricks.client.jdbc42.internal.apache.thrift.transport.TTransportException: HTTP Response code: 502, Error message: Unknown
at com.databricks.client.hivecommon.api.TETHttpClient.handleHeaderErrorMessage(Unknown Source)
at com.databricks.client.hivecommon.api.TETHttpClient.handleErrorResponse(Unknown Source)
at com.databricks.client.hivecommon.api.TETHttpClient.flushUsingHttpClient(Unknown Source)
at com.databricks.client.hivecommon.api.TETHttpClient.flush(Unknown Source)
at com.databricks.client.jdbc42.internal.apache.thrift.TServiceClient.sendBase(TServiceClient.java:73)
at com.databricks.client.jdbc42.internal.apache.thrift.TServiceClient.sendBase(TServiceClient.java:62)
at com.databricks.client.jdbc42.internal.apache.hive.service.rpc.thrift.TCLIService$Client.send_OpenSession(TCLIService.java:147)
at com.databricks.client.hivecommon.api.HS2ClientWrapper.send_OpenSession(Unknown Source)
at com.databricks.client.jdbc42.internal.apache.hive.service.rpc.thrift.TCLIService$Client.OpenSession(TCLIService.java:139)
at com.databricks.client.hivecommon.api.HS2ClientWrapper.callOpenSession(Unknown Source)
at com.databricks.client.hivecommon.api.HS2ClientWrapper.access$1700(Unknown Source)
at com.databricks.client.hivecommon.api.HS2ClientWrapper$18.clientCall(Unknown Source)
at com.databricks.client.hivecommon.api.HS2ClientWrapper$18.clientCall(Unknown Source)
at com.databricks.client.hivecommon.api.HS2ClientWrapper.executeWithRetry(Unknown Source)
at com.databricks.client.hivecommon.api.HS2ClientWrapper.OpenSession(Unknown Source)
... 56 common frames omitted

```

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[Databricks][DatabricksJDBCDriver](500593) Communication link failure. Failed to connect to server.