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https://reviews.apache.org/r/42038/#review113472
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Why go through all of these code changes to accomplish this? It seems like you
could just have removed the `parallel-scheduler` element from the upgrade XML:
```
<group xsi:type="restart" name="HIVE" title="Hive">
<service-check>false</service-check>
<skippable>true</skippable>
<supports-auto-skip-failure>false</supports-auto-skip-failure>
<parallel-scheduler/>
<service name="HIVE">
<component>HIVE_METASTORE</component>
<component>HIVE_SERVER</component>
<component>WEBHCAT_SERVER</component>
<component>HIVE_CLIENT</component>
<component>HCAT</component>
</service>
</group>
```
- Jonathan Hurley
On Jan. 7, 2016, 5:18 p.m., Alejandro Fernandez wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/42038/
> -----------------------------------------------------------
>
> (Updated Jan. 7, 2016, 5:18 p.m.)
>
>
> Review request for Ambari, Dmytro Grinenko, Dmitro Lisnichenko, Jonathan
> Hurley, Jayush Luniya, and Nate Cole.
>
>
> Bugs: AMBARI-14581
> https://issues.apache.org/jira/browse/AMBARI-14581
>
>
> Repository: ambari
>
>
> Description
> -------
>
> During an Express Upgrade, all of the tasks for Hive Server and Hive
> MetaStore run in parallel, so if these components have multiple hosts, then
> running in parallel can cause errors during the upgrade.
> E.g., Hive Server copies tarballs, which can only run one at a time. Hive
> MetaStore updates the schema, and only one can run at a time.
>
>
> Diffs
> -----
>
>
> ambari-server/src/main/java/org/apache/ambari/server/state/stack/upgrade/Grouping.java
> aa852bd
>
> ambari-server/src/main/java/org/apache/ambari/server/state/stack/upgrade/StageWrapperBuilder.java
> b0df83f
>
> ambari-server/src/main/java/org/apache/ambari/server/state/stack/upgrade/Task.java
> 60091a6
>
> ambari-server/src/main/resources/stacks/HDP/2.1/upgrades/nonrolling-upgrade-2.3.xml
> a46a5cd
>
> ambari-server/src/main/resources/stacks/HDP/2.2/upgrades/nonrolling-upgrade-2.2.xml
> e57b13f
>
> ambari-server/src/main/resources/stacks/HDP/2.2/upgrades/nonrolling-upgrade-2.3.xml
> b1c3739
>
> ambari-server/src/main/resources/stacks/HDP/2.3/upgrades/nonrolling-upgrade-2.3.xml
> ba2578b
>
> ambari-server/src/test/java/org/apache/ambari/server/state/UpgradeHelperTest.java
> 7e61942
>
> ambari-server/src/test/java/org/apache/ambari/server/state/stack/UpgradePackTest.java
> 15be8b4
>
> ambari-server/src/test/resources/stacks/HDP/2.0.7/services/HIVE/metainfo.xml
> 35a4d05
>
> ambari-server/src/test/resources/stacks/HDP/2.0.7/services/YARN/metainfo.xml
> beee6a0
>
> ambari-server/src/test/resources/stacks/HDP/2.1.1/upgrades/upgrade_test_nonrolling.xml
> 9f57ca8
>
> Diff: https://reviews.apache.org/r/42038/diff/
>
>
> Testing
> -------
>
> Ran unit tests in UpgradeHelperTest.java and UpgradePackTest.java
> Verified with EU from HDP 2.2->2.3 with multiple Hive MetaStores.
>
> Waiting for unit test results.
>
>
> Thanks,
>
> Alejandro Fernandez
>
>
