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From "Aaron T. Myers (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1108) Log newly allocated blocks
Date Fri, 02 Dec 2011 00:04:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HDFS-1108:
---------------------------------

    Attachment: hdfs-1108-habranch.txt

Here's an updated patch which adds back in the {{dfs.persist.blocks}} config and changes the
test to use it. Persistence of blocks is also enabled automatically in the case HA is enabled
with shared edits dir, regardless of the value of {{dfs.persist.blocks}}.
                
> Log newly allocated blocks
> --------------------------
>
>                 Key: HDFS-1108
>                 URL: https://issues.apache.org/jira/browse/HDFS-1108
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: dhruba borthakur
>            Assignee: Todd Lipcon
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: HDFS-1108.patch, hdfs-1108-habranch.txt, hdfs-1108-habranch.txt,
hdfs-1108-habranch.txt, hdfs-1108-habranch.txt, hdfs-1108.txt
>
>
> 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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