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https://issues.apache.org/jira/browse/AMBARI-19574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Hurley updated AMBARI-19574:
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Attachment: AMBARI-19574.patch
> Add upgrade logic for the heap dump control option added in HDP 2.6 stack.
> --------------------------------------------------------------------------
>
> Key: AMBARI-19574
> URL: https://issues.apache.org/jira/browse/AMBARI-19574
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 2.5.0
> Reporter: Jonathan Hurley
> Assignee: Jonathan Hurley
> Priority: Critical
> Fix For: 2.5.0
>
> Attachments: AMBARI-19574.patch
>
>
> Looking at https://reviews.apache.org/r/54527, some properties were added for
> Hive and Hive2 which need to be included in the upgrade from HDP 2.5 to HDP
> 2.6.
> - It looks like the following properties were added to HDP 2.6 only. They
> will automatically be merged in on stack upgrades from HDP 2.5, so there's no
> work to be done there. The following will be automatically merged in since
> they are completely new:
> -- {{hive-env/enable_heap_dump}}
> -- {{hive-env/heap_dump_location}}
> -- {{tez-env/enable_heap_dump}}
> -- {{tez-env/heap_dump_location}}
> - Since Ambari 2.4 doesn't support HDP 2.6, that means we don't need to worry
> about HDP 2.6 to HDP 2.6 at all (where we would need to add the above
> properties manually).
> - Now the interesting part. The following properties are _NOT_ new. They
> existed in prior stacks, which means that they will be automatically merged
> only if they have not changed their default values on the prior stack:
> -- {{tez-site/tez.task.launch.cmd-opts}}
> -- {{hive-env/content}}
> -- {{hive-interactive-env/llap_java_opts}}
> -- {{hive-interactive-env/content}}
> So, what do we do with them?
> - {{tez-site/tez.task.launch.cmd-opts}} and
> {{hive-interactive-env/llap_java_opts}} don't seem too bad since it looks
> like the main difference is a token. We can do a find/replace for this:
> -- {code:title=tez-site}
> Replace: -XX:+UseParallelGC
> with
> XX:+UseParallelGC{{heap_dump_opts}}
> {code}
> -- {code:title=hive-interactive-env/llap_java_opts}
> Replace -XX:+UseParallelGC{% endif %}
> with
> XX:+UseParallelGC{% endif %}{{heap_dump_opts}}
> {code}
> However the {{content}} properties are much harder to work with, as customers
> change them all the time. This is where we need something more flexible than
> replace - something like an insert.
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