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https://issues.apache.org/jira/browse/DRILL-5485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jinfeng Ni resolved DRILL-5485.
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Resolution: Fixed
Fixed in 874bf6296dcd1a42c7cf7f097c1a6b5458010cbb
> Remove WebServer dependency on DrillClient
> ------------------------------------------
>
> Key: DRILL-5485
> URL: https://issues.apache.org/jira/browse/DRILL-5485
> Project: Apache Drill
> Issue Type: Improvement
> Components: Web Server
> Reporter: Sorabh Hamirwasia
> Labels: ready-to-commit
> Fix For: 1.11.0
>
>
> With encryption support using SASL, client's won't be able to authenticate
> using PLAIN mechanism when encryption is enabled on the cluster. Today
> WebServer which is embedded inside Drillbit creates a DrillClient instance
> for each WebClient session. And the WebUser is authenticated as part of
> authentication between DrillClient instance and Drillbit using PLAIN
> mechanism. But with encryption enabled this will fail since encryption
> doesn't support authentication using PLAN mechanism, hence no WebClient can
> connect to a Drillbit. There are below issues as well with this approach:
> 1) Since DrillClient is used per WebUser session this is expensive as it has
> heavyweight RPC layer for DrillClient and all it's dependencies.
> 2) If the Foreman for a WebUser is also selected to be a different node then
> there will be extra hop of transferring data back to WebClient.
> To resolve all the above issue it would be better to authenticate the WebUser
> locally using the Drillbit on which WebServer is running without creating
> DrillClient instance. We can use the local PAMAuthenticator to authenticate
> the user. After authentication is successful the local Drillbit can also
> serve as the Foreman for all the queries submitted by WebUser. This can be
> achieved by submitting the query to the local Drillbit Foreman work queue.
> This will also remove the requirement to encrypt the channel opened between
> WebServer (DrillClient) and selected Drillbit since with this approach there
> won't be any physical channel opened between them.
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