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From "Bikas Saha (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3300) stream the edit segments to NameNode when NameNode starts up
Date Thu, 19 Apr 2012 17:10:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13257606#comment-13257606
] 

Bikas Saha commented on HDFS-3300:
----------------------------------

What is the plan of action when there are errors in streaming? NN will shutdown with error?
Will the streamed edits also be dumped to disk in parallel? So that next time around they
are available locally instead of having to stream them again.
                
> stream the edit segments to NameNode when NameNode starts up
> ------------------------------------------------------------
>
>                 Key: HDFS-3300
>                 URL: https://issues.apache.org/jira/browse/HDFS-3300
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>            Reporter: Brandon Li
>
> Edit logs are saved on Journal daemon. When NameNode starts, it loads the latest image
file and then streams the edit logs from an active Journal daemon. 
> Currently we are using http to transfer edit files between two journal daemons/nodes
or between a journal daemon and a NameNode. To get edit file from Journal daemon, the NameNode
has to download it first and then read it from the disk.
> To avoid the slow start-up time, NameNode should be enhance to read the http data stream
and update its in memory name space instead of saving the streamed data on disk first.

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