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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2018) 1073: Move all journal stream management code into one place
Date Wed, 24 Aug 2011 18:52:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090403#comment-13090403
] 

Sanjay Radia commented on HDFS-2018:
------------------------------------

In the case of BN the edits will roll in sync since the 'closeEdit" transaction  is visible
to the BN.
For the checkpointer it desirable to have have them in sycn. The checkpointer can request
a stream of edits following a tx id (the one beyond the fsimage checkpoint) and similarly
roll on each "closeEdit" transaction. The CN will do that anyway since it is essentially the
BN code. The 2NN should request a stream and can roll on each "closeEdit" transaction.

The JournalInterface can provide a "remote impl" that gets the edits from the NN.

> 1073: Move all journal stream management code into one place
> ------------------------------------------------------------
>
>                 Key: HDFS-2018
>                 URL: https://issues.apache.org/jira/browse/HDFS-2018
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>             Fix For: 0.23.0
>
>         Attachments: HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff,
HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff,
HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff,
hdfs-2018-otherapi.txt, hdfs-2018.txt
>
>
> Currently in the HDFS-1073 branch, the code for creating output streams is in FileJournalManager
and the code for input streams is in the inspectors. This change does a number of things.
>   - Input and Output streams are now created by the JournalManager.
>   - FSImageStorageInspectors now deals with URIs when referring to edit logs
>   - Recovery of inprogress logs is performed by counting the number of transactions instead
of looking at the length of the file.
> The patch for this applies on top of the HDFS-1073 branch + HDFS-2003 patch.

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