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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-1752) "dfsadmin -upgradeProgress force" should leave safe mode in order to push the upgrade forward.
Date Thu, 23 Oct 2008 22:58:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Raghu Angadi resolved HADOOP-1752.
----------------------------------

    Resolution: Won't Fix

This applies only to clusters upgrading from 0.13 or before. This upgrade is no longer supported
in current HDFS.

> "dfsadmin -upgradeProgress force" should leave safe mode in order to push the upgrade
forward.
> ----------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1752
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1752
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.14.0
>            Reporter: Konstantin Shvachko
>            Assignee: Raghu Angadi
>
> I have a cluster (created before hadoop 0.14) on which 40% of data-node blocks were lost.
I tried to upgrade it to 0.14.
> The distributed upgrade was scheduled correctly on the name-node and all data-nodes.
But it never started, since
> there was not enough blocks for the name-node to leave safe mode.
> I first tried
> {code}
> bin/hadoop dfsadmin -safemode leave
> {code}
> But this is prohibited since the distributed upgrade is in progress. I tried 
> {code}
> bin/hadoop dfsadmin -upgradeProgress force
> {code}
> But these didn't work because the distributed upgrade does not start until the safe mode
conditions are met on the name-node.
> The solution would be to set the safe-mode-threshold to 60% if of course I new exactly
how many blocks were missing.
> The "force" command was designed as a way for an administrator to get the upgrade going
even if the cluster is not in the perfect shape.
> This would let us save at least the data available rather than loosing everything.
> I propose to modify the force command so that it would let the cluster start distributed
upgrade even if safe-mode is still on.

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