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https://issues.apache.org/jira/browse/HDFS-2018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090605#comment-13090605
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Eli Collins commented on HDFS-2018:
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Here are the notes from the call we had today:
# We discussed whether to have an explicit recoverLogs API in JournalManager.
Todd explained the motivation for the API - shared storage the standy wants to
call getInputStream w/o necesarily initiating recovery, so the explicit API is
needed.
# We discussed whether/how to expose the segments. Jitendra discussed one
option: hiding the segments via having a JournalAdminInterface with
getEditLogManifest method that manages transfer from primary to the standby and
checkpointer. The JournalManager and the checkpointer both implement this
interface. Todd discussed an intermediate step, using the tuples of log
segments and delaying JournalAdminInterface to 1580. Sanjay proposed trying to
get rid of segments in 1580 and doing that incrementally in a separate jira,
people thought that was reasonable.
# Todd raised some concerns about removing the caching introduced in HDFS-2018,
Sanjay and Jitendra are going to take a look and comment.
> 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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