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From "John Zhuge (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13597) Switch KMS from Tomcat to Jetty
Date Thu, 08 Dec 2016 22:22:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15733571#comment-15733571
] 

John Zhuge commented on HADOOP-13597:
-------------------------------------

[~aw] I tries to preserve exactly the same behavior as the existing {{hadoop_deprecate_envvar}}
when {{newvar}} is not empty. Isn't {{-z}} the reverse of {{-n}}? Did I miss something?

The current code:
{code}
function hadoop_deprecate_envvar
{
  local oldvar=$1
  local newvar=$2
  local oldval=${!oldvar}
  local newval=${!newvar}

  if [[ -n "${oldval}" ]]; then          <<<<<<<====
    hadoop_error "WARNING: ${oldvar} has been replaced by ${newvar}. Using value of ${oldvar}."
    # shellcheck disable=SC2086
    eval ${newvar}=\"${oldval}\"

    # shellcheck disable=SC2086
    newval=${oldval}

    # shellcheck disable=SC2086
    eval ${newvar}=\"${newval}\"
  fi
}
{code}

> 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, HADOOP-13597.003.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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