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https://issues.apache.org/jira/browse/HADOOP-13597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15716720#comment-15716720
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John Zhuge commented on HADOOP-13597:
-------------------------------------
I was wrong. The test case {{HADOOP_KMS_OPTS=-Dkms.config.dir=.. bin/hadoop
kms}} works in both approaches, though for different reasons:
* All in one: {{hadoop_subcommand_kms}} adds {{-Dkms_config_dir}} first, then
HADOOP_KMS_OPTS is appended to HADOOP_OPTS. The later {{-Dkms.config.dir}} on
HADOOP_OPTS takes effect.
* multiple handlers: HADOOP_KMS_OPTS is appended to HADOOP_OPTS first, then
_kms_hadoop_finalize calls {{hadoop_add_param HADOOP_OPTS "-Dkms.config.dir="}}
which checks the existence of string "-Dkms.config.dir=" and decides not to add
param.
> Switch KMS from Tomcat to Jetty
> -------------------------------
>
> Key: HADOOP-13597
> URL: https://issues.apache.org/jira/browse/HADOOP-13597
> Project: Hadoop Common
> Issue Type: New Feature
> Components: kms
> Affects Versions: 2.6.0
> Reporter: John Zhuge
> Assignee: John Zhuge
> Attachments: HADOOP-13597.001.patch, HADOOP-13597.002.patch
>
>
> The Tomcat 6 we are using will reach EOL at the end of 2017. While there are
> other good options, I would propose switching to {{Jetty 9}} for the
> following reasons:
> * Easier migration. Both Tomcat and Jetty are based on {{Servlet
> Containers}}, so we don't have change client code that much. It would require
> more work to switch to {{JAX-RS}}.
> * Well established.
> * Good performance and scalability.
> Other alternatives:
> * Jersey + Grizzly
> * Tomcat 8
> Your opinions will be greatly appreciated.
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