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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1108) Log newly allocated blocks
Date Fri, 20 Jul 2012 18:57:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419442#comment-13419442

Sanjay Radia commented on HDFS-1108:

This is useful for restarting a failed NN  - with manual or automatic restart. 
Hence yes, it is useful for HA in Hadoop 1.
> Log newly allocated blocks
> --------------------------
>                 Key: HDFS-1108
>                 URL: https://issues.apache.org/jira/browse/HDFS-1108
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>            Reporter: dhruba borthakur
>            Assignee: Todd Lipcon
>             Fix For: HA branch (HDFS-1623), 1.1.0
>         Attachments: HDFS-1108.patch, hdfs-1108-habranch.txt, hdfs-1108-habranch.txt,
hdfs-1108-habranch.txt, hdfs-1108-habranch.txt, hdfs-1108-habranch.txt, hdfs-1108-hadoop-1-v2.patch,
hdfs-1108-hadoop-1-v3.patch, hdfs-1108-hadoop-1-v4.patch, hdfs-1108-hadoop-1-v5.patch, hdfs-1108-hadoop-1.patch,
> The current HDFS design says that newly allocated blocks for a file are not persisted
in the NN transaction log when the block is allocated. Instead, a hflush() or a close() on
the file persists the blocks into the transaction log. It would be nice if we can immediately
persist newly allocated blocks (as soon as they are allocated) for specific files.

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