[jira] Issue Comment Edited: (HADOOP-1188) processIOError() should update fstime file

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

    [ https://issues.apache.org/jira/browse/HADOOP-1188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564182#action_12564182 ] 

shv edited comment on HADOOP-1188 at 1/30/08 5:58 PM:
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I was thinking about a unit test, but I cannot figure our how to make it work especially on windows.
I need to make a directory unaccessible while the name-node is still running, but ntfs does not
let you modify anything about open files.
When I debugged this patch on Win I had to mount a "network drive", start name-node with one of 
the directories on the mounted drive, then disconnect the drive and then perform a create or delete.
This works for debugging but I don't know how to make a unit test out of it.
Let me know if you have any ideas.

      was (Author: shv):
    I was thinking about a unit test, but I cannot figure our how to make it work especially on windows.
I need to make a directory unaccessible while the name-node is till running, but ntfs does not
let you modify anything about open files.
When I debugged this patch on Win I had to mount a "network drive", start namenode with one of 
the directories on the mounted drive, then disconnecting the drive and then perform a create or delete.
This works for debugging but I don't know how to make a unit test out of it.
Let me know if you have any ideas.
  
> processIOError() should update fstime file
> ------------------------------------------
>
>                 Key: HADOOP-1188
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1188
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.10.1, 0.11.2, 0.12.2
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>            Priority: Blocker
>             Fix For: 0.16.1
>
>         Attachments: hadoop-1188.patch
>
>
> Name-node can have multiple directories to store the name space image and edits.
> During startup the name-node selects the latest image and reads it in memory.
> fstime stores the time of the latest checkpoint.
> If one of the directories becomes inaccessible during normal operation the name-node
> excludes it from the list, and never writes anything into it until restarted.
> Now if the the name-node restarts after excluding one of the directories, and if that
> excluded directory contained the latest image, then all modifications of the name space
> recorded in edits files in other directories starting from the moment the directory was
> excluded will be lost.
> We should update fstime in all remaining good directories after the exclusion.

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