[HIVE-12958] Make embedded Jetty server more configurable

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.1.0
• Component/s: HCatalog
• Labels: TODOC2.1

Release Note

A new property 'templeton.jetty.configuration' can be set pointing to an XML file in webhcat configuration file to enable the embedded Jetty configuration from such file.

   <property>
     <name>templeton.jetty.configuration</name>
     <value></value>
     <description>The embedded jetty configuration file.</description>
   </property>

We can follow https://wiki.eclipse.org/Jetty/Tutorial/Embedding_Jetty#Configuring_a_File_Server_with_XML to make the xml configuration file to update the settings.

Here is an example:

<?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure.dtd">

<Configure id="FileServer" class="org.eclipse.jetty.server.Server">
    <Call name="addConnector">
      <Arg>
          <New class="org.eclipse.jetty.server.nio.SelectChannelConnector">
            <Set name="port">9999</Set>
            <Set name="requestHeaderSize">65535</Set>
          </New>
      </Arg>
    </Call>
</Configure>

• Assignee: Aihua Xu
• Reporter: Aihua Xu
• Created: 28/Jan/16 20:54
• Updated: 21/Jun/16 15:53
• Resolved: 04/Feb/16 16:00

Description

Currently you can't configure embedded jetty within HCatalog. Propose to support an xml configuration which Jetty already supports. A new Web-hcat property will be added to specify the configure file location. If the file doesn't exist, falls back to old behavior. If it exists, such configuration will be loaded to configure embedded Jetty server.

Some default parameters for Jetty may not be sufficient for some cases such as request/response buffer size. This improvement allows to make such change.