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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4179) BackupNode: allow reads, fix checkpointing, safeMode
Date Mon, 12 Nov 2012 20:49:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko updated HDFS-4179:
--------------------------------------

    Attachment: BNAllowReads.patch

The patch 
- makes BN accept read commands, but not CN. 
- Checkpointer first uploads all files then loads them in memory.
- Safemode on BN should be set to unreachable threshold. Also there was an assert triggered
by doConsistencyCheck() for BN.
- Added a test case that verifies reads for BN and CN.
                
> BackupNode: allow reads, fix checkpointing, safeMode
> ----------------------------------------------------
>
>                 Key: HDFS-4179
>                 URL: https://issues.apache.org/jira/browse/HDFS-4179
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 2.0.2-alpha
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>         Attachments: BNAllowReads.patch
>
>
> BackupNode should be allowed to accept read command. Needs some adjustments in checkpointing
and with safe mode.

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