[jira] Updated: (HADOOP-2373) Name node silently changes state

["Konstantin Shvachko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-2373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Shvachko updated HADOOP-2373:
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    Attachment: SafeModeReport.patch

This patch provides better reporting of the safe-mode state.
- It prints what is the current ratio of the reported blocks.
- It reports when safe mode enters the extended wait period and says how many seconds remained till the name-node will leave it.
- It logs the name-node state every 20 seconds.


> Name node silently changes state
> --------------------------------
>
>                 Key: HADOOP-2373
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2373
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Robert Chansler
>            Assignee: Konstantin Shvachko
>             Fix For: 0.17.0
>
>         Attachments: SafeModeReport.patch
>
>
> 1. The name node should create a log message when entering the "extension" period of safe mode after achieving the minimal replication threshold.
> Logging state changes is a Good Idea. When diagnosing 2159, there is no evidence whether the name node is in the extension period or not.
> 2. When in safe mode, the name node should periodically explain _why_ it is still in safe mode. (2159 again)

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