[jira] Commented: (HADOOP-4103) Alert for missing blocks

["Raghu Angadi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650746#action_12650746 ] 

Raghu Angadi commented on HADOOP-4103:
--------------------------------------

I thinking of implementing a background fsck on NameNode. This will share/reuse most of the code with current Fsck. The extra features will be to facilitate an admin to quickly check if there something odd (e.g. ability list last 100 or so blocks in inconsistent state).

 Based on this background check there could be further improvements to monitoring more alarms over time.. as well as reducing latency of detection.

This feature will be optional. Scan period could be around a day. 



> Alert for missing blocks
> ------------------------
>
>                 Key: HADOOP-4103
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4103
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>    Affects Versions: 0.17.2
>            Reporter: Christian Kunz
>            Assignee: Raghu Angadi
>
> A whole bunch of datanodes became dead because of some network problems resulting in  heartbeat timeouts although datanodes were fine.
> Many processes started to fail because of the corrupted filesystem.
> In order to catch and diagnose such problems faster the namenode should detect the corruption automatically and provide a way to alert operations. At the minimum it should show the fact of corruption on the GUI.

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