title: Fetching username inside notebook in Databricks on high concurrency cluster?
body: <p>While trying to fetch user data on high concurrency cluster, I am facing this issue. I am using the  command below  to fetch the user details</p>
  <blockquote>
  <p>dbutils.notebook.entry_point.getDbutils().notebook().getContext().tags().apply('user')</p>
  </blockquote>
  <p>Below is the error log, for the run. Any help would be really appreciated.</p>
  <pre><code>Py4JError: An error occurred while calling o475.tags. Trace:
  py4j.security.Py4JSecurityException: Method public scala.collection.immutable.Map com.databricks.backend.common.rpc.CommandContext.tags() is not whitelisted on class class com.databricks.backend.common.rpc.CommandContext
      at py4j.security.WhitelistingPy4JSecurityManager.checkCall(WhitelistingPy4JSecurityManager.java:409)
      at py4j.Gateway.invoke(Gateway.java:294)
      at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
      at py4j.commands.CallCommand.execute(CallCommand.java:79)
      at py4j.GatewayConnection.run(GatewayConnection.java:251)
      at java.lang.Thread.run(Thread.java:748)
  </code></pre>