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From "Jayush Luniya (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMBARI-16028) Namenode marked as INITIAL standby could potentially never start if other namenode is down
Date Thu, 21 Apr 2016 22:18:13 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-16028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jayush Luniya updated AMBARI-16028:
-----------------------------------
    Status: Patch Available  (was: In Progress)

> Namenode marked as INITIAL standby could potentially never start if other namenode is
down
> ------------------------------------------------------------------------------------------
>
>                 Key: AMBARI-16028
>                 URL: https://issues.apache.org/jira/browse/AMBARI-16028
>             Project: Ambari
>          Issue Type: Bug
>          Components: stacks
>    Affects Versions: 2.2.0
>            Reporter: Jayush Luniya
>            Assignee: Jayush Luniya
>            Priority: Critical
>             Fix For: 2.4.0
>
>         Attachments: AMBARI-16028-trunk.patch
>
>
> *Issue:*
> # During Namenode HA blueprint deployment, we configure the name nodes to start in active/standby
mode based on the following properties
> {code}
>      {
>         "hadoop-env": {
>           "properties" : {
>             "dfs_ha_initial_namenode_active" : "jay-msft-1.c.pramod-thangali.internal",
>             "dfs_ha_initial_namenode_standby" : "jay-msft-2.c.pramod-thangali.internal”
>           }
>         }
>       }
> {code}
> # The current logic is to always bootstrap the name node marked as standby. 
> # This will lead to the Namenode marked as Standby to never start under the following
situation
> - Cluster is deployed successfully
> - Both name nodes are stopped
> - Start the name node marked as standby. Namenode will never start.
> - This is because the standby name node will try to bootstrap again. 
> - However to bootstrap a name node an active name node is required. Based on the HDFS
logic the first step done when bootstrapping is to connect to the Active Namenode. 
> - Also there is no need to bootstrap here as the name node should already be bootstrapped
and should come back up as “Active"



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