[jira] [Commented] (AMBARI-6468) NameNode HA wizard: create JournalNode and ZKFC components before installing them

["Aleksandr Kovalenko (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMBARI-6468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14059010#comment-14059010 ] 

Aleksandr Kovalenko commented on AMBARI-6468:
---------------------------------------------

+1 for the patch

> NameNode HA wizard: create JournalNode and ZKFC components before installing them
> ---------------------------------------------------------------------------------
>
>                 Key: AMBARI-6468
>                 URL: https://issues.apache.org/jira/browse/AMBARI-6468
>             Project: Ambari
>          Issue Type: Task
>          Components: client
>    Affects Versions: 1.7.0
>            Reporter: Antonenko Alexander
>            Assignee: Antonenko Alexander
>             Fix For: 1.7.0
>
>         Attachments: AMBARI-6468.patch
>
>
> In Ambari-1.6.0 release, we did not created JournalNode and ZKFC service components while installing a cluster and created it in NameNode HA wizard.
> In Ambari-1.6.1 dev cycle we started creating all service components for all selected services including JournalNode and ZKFC. With BUG-18689 commit, we then removed creating JournalNoe and ZKFC in NameNode HA wizard. This creates problem when cluster is installed via blueprint and then namennode HA is enabled or when cluster is upgraded and then namenode HA is enabled as in both the scenarios JournalNode and ZKFC service components are not created and wizard tries to install them.
> We should make NameNode HA wizard more resilient. Let namenode HA wizard make API call to create service components for JournaNode and ZKFC as before. In case if we receive POST conflict error then web-client should not display it in an error pop-up and start installing components
> {code}
> {
>   "status" : 409,
>   "message" : "Attempted to create a component which already exists: [clusterName=c1, serviceName=HDFS, componentName=JOURNALNODE]"
> }
> {code}



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