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https://issues.apache.org/jira/browse/HDFS-2018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085929#comment-13085929
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Sanjay Radia commented on HDFS-2018:
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HDFS-1073 has a sequence of patches that move us towards the final solution:
* Todd's changes added a concept called loadPlan plus segments that were
visible that I did not like.
* HDFS-2018 makes improvements - removes loadPlan but we are debating [arts of
it
* HDFS-1580 further cleans this up and hides the edit log segments inside the
journal interface.
We need to look at the above as set of improvements and decide on whether we
like the final solution.
I let 1073 get merged in because the final solution was acceptable.
Todd, is the final solution after HDFS-1580 acceptable to you? Looks like you
want to expose segments based on some of your comments in this Jira. 1s that
indeed the main area of disagreement?
> 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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