[jira] [Created] (AMBARI-12850) Downgrade to 2.2.6 stuck while doing RU to 2.3

["Jonathan Hurley (JIRA)" <ji...@apache.org>]

Jonathan Hurley created AMBARI-12850:
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             Summary: Downgrade to 2.2.6 stuck while doing RU to 2.3 
                 Key: AMBARI-12850
                 URL: https://issues.apache.org/jira/browse/AMBARI-12850
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
    Affects Versions: 2.1.0
            Reporter: Jonathan Hurley
            Assignee: Jonathan Hurley
            Priority: Critical
             Fix For: 2.1.2


When performing a downgrade from HDP 2.3 to HDP 2.2, the web client can sometimes not show the Retry button in the event of a failure. The problem stems from two issues:
- When retrying a stage with hosts not heartbeating, the entire stage is automatically aborted
- Task updates in stages is done in a non-atomic manner. 

{code:java}
{
  "Upgrade" : {
    "cluster_name" : "c1",
    "request_id" : 21
  },
  "upgrade_groups" : [
    {
      "UpgradeGroup" : {
        "completed_task_count" : 2,
        "group_id" : 22,
        "in_progress_task_count" : 0,
        "name" : "CORE_SLAVES",
        "progress_percent" : 100.0,
        "request_id" : 21,
        "status" : "COMPLETED",
        "title" : "Core Slaves",
        "total_task_count" : 2
      }
    },
    {
      "UpgradeGroup" : {
        "completed_task_count" : 5,
        "group_id" : 23,
        "in_progress_task_count" : 3,
        "name" : "CORE_MASTER",
        "progress_percent" : 81.42857142857143,
        "request_id" : 21,
        "status" : "HOLDING_FAILED",
        "title" : "Core Masters",
        "total_task_count" : 8
      }
    },
    {
      "UpgradeGroup" : {
        "completed_task_count" : 2,
        "group_id" : 24,
        "in_progress_task_count" : 1,
        "name" : "ZOOKEEPER",
        "progress_percent" : 66.66666666666666,
        "request_id" : 21,
        "status" : "IN_PROGRESS",
        "title" : "ZooKeeper",
        "total_task_count" : 3
      }
    },
    {
      "UpgradeGroup" : {
        "completed_task_count" : 5,
        "group_id" : 25,
        "in_progress_task_count" : 0,
        "name" : "POST_CLUSTER",
        "progress_percent" : 100.0,
        "request_id" : 21,
        "status" : "COMPLETED",
        "title" : "Finalize Downgrade",
        "total_task_count" : 5
      }
    }
  ]
}
{code}

Since we have upgrade group in IN_PROGRESS state, and no upgrade items in IN_PROGRESS state, following situation happened. After upgrade failed, all IN_PROGRESS groups, items should be transitioned into ABORTED state, so this is BE issue in order to avoid such a collision.



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